Electrical Engineering Study Guide: DC Motors, Capacitors, and Safety Procedures, Exams of Engineering

Download Electrical Engineering Study Guide: DC Motors, Capacitors, and Safety Procedures and more Exams Engineering in PDF only on Docsity! Stationary Engineer Electric Exam Questions With 100% Correct Answers 2024 An AC circuit consists only of a pure inductance and a power source. The relationship between the voltage and the current in this circuit is that the - Correct Answer-current lags the voltage The power factor of a load is equal to the ____________ power divided by the ____________ power. - Correct Answer- True ; apparent A 10-ohms and 20-ohms resistor are connected in parallel. The total line current drawn by this parallel combination is 30 amps. Under these conditions, the line voltage will be ____________ volts. - Correct Answer-200 A 20-ohm resistor is connected in series with a parallel combination of two resistors, one of which is 10-ohms, the other 40-ohms. If the voltage across the parallel combination is 40 volts, the voltage across the 20-ohm series resistor is ________ volts. - Correct Answer-100 A certain 120-volts single-phase AC circuit has a power factor of 80 percent and a watt-meter reading of 1150 watts. The current drawn by the circuit is _________ amperes. - Correct Answer-12 If the voltage between lines of a 3-phase, 3-wire delta connected system is 2400 volts, then the phase voltage is _____________ volts - Correct Answer-2400 A circuit consists of an inductive reactance of 15 ohms and a resistor of 20 ohms in series across a 100-volts, 60 cycles AC supply. The current in this circuit is ____________ amperes. - Correct Answer-4 A 3 phase, 3 wire, 208 volt, 60 cycles AC service supplies a balanced load consisting of three 30 ohms resistors connected wye. The line current under these conditions os MOST NEARLY ___________ amperes. - Correct Answer-6.9 If the level of the electrolyte in a lead acid storage battery falls below the top of the plates because of evaporations under normal operating conditions, it is BEST to add - Correct Answer-Water The number of poles in the field of an alternator generating voltage at a frequency of 60 cycles per second while rotating at 1200 rpm is - Correct Answer-6 If the field of a shunt motor opens while running, the motor will - Correct Answer-run away To reverse the direction of rotation of a cumulative compound motor, and not have it run as a differential compound motor, reverse the connections to the ____________ field. - Correct Answer-shunt field and to the series A main contributing factor to motor stator failure usually is - Correct Answer-dirt The input of a motor is 40,000 watts and efficiency is 80 percent. The TOTAL energy loss is __________ watts. - Correct Answer-8,000 The full load current of a three-phase 5 hp motor operating at 200 volts, 60 cycles, and having an efficiency of 80 percent and a power factor of 85 percent is MOST NEARLY ____________ amperes. - Correct Answer-14.4 Of the following motors, the one that has the best speed regulation is the motor. - Correct Answer-shunt The full load speed of a 60-cycle 208 volt, 3 phase induction motor having 6 poles and operating with a slip of 10% is MOST NEARLY___________ r.p.m - Correct Answer-1080 Of the following, a MAJOR advantage of an AC synchronous motor is that it(s) - Correct Answer-can be used for power factor correction If the field current of a synchronous motor is increased to a point which makes the synchronous motor overexcited, the - Correct Answer-motor will take a leading current When transformers are to be operated in parallel, it is NOT necessary that the transformer have the same - Correct Answer-KVA rating A transformer rates at 200 KVA is FULLY loaded with a lagging power factor of 80% when it is supplying - Correct Answer-160 KW If the current in the primary of a current transformer is 500 amperes and the transformer has a ratio of 100 to 5, an ammeter connected to the secondary will read MOST NEARLY___________ amperes. - Correct Answer-25 Assume that a switchboard ammeter which is connected to a current transformer is damaged and must be removed without interrupting the service. Of the following, an ESSENTIAL precaution to be taken before disconnecting the ammeter is to - Correct Answer-short the secondary of the transformer A DC relay is rated at 6 volts and 120 ohms. This relay can be operated from a 120 volt line by connecting a ___________ ohm resistance in __________ with relay - Correct Answer- 2280: series Some relays are provided with dash-pots. The FUNCTION of these dash-pots is to provide - Correct Answer-delayed time action An ammeter has a full scale deflection for a current of 0.01 amperes and an internal resistance of 20 ohms. In order to brim with water, is MOSTLY NEARLY ______________ lbs/sq.ft. - Correct Answer-500 The MAXIMUM height to which water can be lifted by means of suction alone, at sea level, is APPROXIMATELY _____________ feet. - Correct Answer-34 The TOTAL number of 4 inch diameter pipe that is required to equal the water flow capacity of an 8 inch diameter pipe (negating friction) is - Correct Answer-4 The number of threads, per inch, on the standard machine screw MOST suitable for general use is - Correct Answer-32 The friction losses which occur when water flows through a pipe vary MOST NEARLY _____________ with the ____________. - Correct Answer-directly; velocity squared Small by-pass lines are sometimes furnished around large gate valves MAINLY to - Correct Answer-balance the pressure on the gate when the valve is being opened The sudden surge caused by an abrupt change in the speed of the pumps in a closed liquid piping system is USUALLY called - Correct Answer-water hammer The valve that permits water to flow one direction only is the ____________ valve - Correct Answer-check Most flanged butterfly valves can be brought from a fully closed position to a fully opened position in _____________ turn(s). - Correct Answer-a quarter The efficiency of two centrifugal pumps operating in parallel is ___________ of one of the pumps operating alone. - Correct Answer-practically the same as that Assume that a spur gear having 20 teeth revolves at 80 r.p.m and drives another super gear having 40 teeth. The speed at which the gear having 40 teeth revolves is _____________ r.p.m. - Correct Answer-40 A centrifugal pump has a plain flat-joint seal between the impeller and the casting. If the clearance of the seal become enlarged due to wear, thereby reducing the pump's efficiency, it would be GOOD practice to - Correct Answer-renew the impeller The one of the following statement which CORRECTLY describes a speed characteristic for a centrifugal pump under normal operating conditions is: - Correct Answer-Total head varies directly with the square of the speed The MAIN function of a pump stuffing box is to - Correct Answer-protect the pump against leakage at the point where the shaft passes through the pump casting The PROPER order of the event that takes place in a stroke internal combustion engine - Correct Answer-Air intake, compression, power expansion, and exhaust The number of cycles in an internal combustion engine is AT LEAST ____________ cycles. - Correct Answer-two The lumens per watt taken by a lamp varies with the types and size When flammable liquids are poured form one containers to another, a bond wire is some-times connected between the containers to - Correct Answer-eliminate sparks due to static electricity The proper way to lift a heavy object includes all of the following techniques EXCEPT - Correct Answer-Placing the feet as a far away from the object as possible The contents of different piping systems are sometimes are sometimes identified by means of standard color codes, such as the one recommended by the American National Standards Institute (formerly the American Standard Institute). According to this Institute's standards, a piping system used for fire protection should be designated by the color - Correct Answer-red Assume that the contents of a container are described as TOXIC. This means they are - Correct Answer-poisonous An authoritative source of emergency information on antidotes is the - Correct Answer-Poison Control Center, Department of Health Unexpected operation of electrical equipment that can be started by remote control may cause injury to workers making repairs. Before making repairs on such equipment, it is GOOD practice to - Correct Answer-follow a lockout procedure Assume that one of the men under your supervision asks you a technical question to which you do not know the answer. Of the following, it is BEST that you - Correct Answer-tell him that you do not know the answer but that you will get the information for him In order standard cartridge fuses, it is necessary to specify only the - Correct Answer-current capacity of the circuit and the power to be dissipated A synchronous motor having 12 poles and operating on 60- cycles alternating current would have a speed, in r.p.m., of MOSTLY NEARLY - Correct Answer-600 In fully charged lead acid storage battery, the active material of the plates is - Correct Answer-lead peroxide on the positive and sponge lead on the negative plates Assume that a three-phase wound rotor induction motor is running at full speed and no load when the connection between the windings and one of the collector rings suddenly breaks. Under this condition, the motor will - Correct Answer- run at half speed Of the following, the PRIMARY function of a pyrometer is to measure - Correct Answer-temperature In general, the temperature of a gas or vapor compressor in a limited space will - Correct Answer-increase Assume that the stem of a large valve has multiple threes. Of the following , the BEST reason for using multiple threads in this instance is to - Correct Answer-permit the valve to be opened or closed faster Of the following, the valve generally used where accurate throttling is required such as for instrument, gage, or meter line service is the ______________ valve. - Correct Answer- needle Assume that a certain 120 volts single phase AC circuit draws a current of 12 amperes and a wattmeter in the circuit reads 1150 watts. The power factor, in percent, of this circuit is MOST NEARLY - Correct Answer-80 If the voltage between lines in a 3 phase, 4 wire systems is 4160 volts, the voltage to neutral is MOST NEARLY - Correct Answer-2400 Assume that the contacts of an air circuit breaker flash from one to the other. Of the following troubles, the one which is MOST likely to cause these symptoms is - Correct Answer- barriers broken The term trip-free applies to a circuit breaker that - Correct Answer-can be tripped by the overload mechanism even though the operating lever is held in the closed position The insulation resistance of a certain rubber-insulated single conductor cable 2200 feet long is 360 megohms. If a 1100 foot section of this cable is cut off, it will have an insulation resistance, in megohms, of MOST NEARLY - Correct Answer- 720 When the level of the electrolyte in a lead acid storage battery has fallen below the top of the plates, the MOST preferred of the following actions is to rise the electrolyte level __________ charging by adding ____________. - Correct Answer-before; water Thee gases usually generated by electrolytic action while charging a lead acid storage battery are - Correct Answer- hydrogen and oxygen On a DC generator, the polarity of an Interpol is the same as that of the ____________ in the direction of rotation. - Correct Answer-main pole it follows The distance between the center lines of adjacent north and south poles, measured along the circumference at the armature surface of an alternator, is called the - Correct Answer-pole pitch Compensator starters for polyphase squirrel cage motor are basically - Correct Answer-autotransformers In general, the power factor of a polyphase squirrel cage induction motor will - Correct Answer-increase if the load increases A certain pumping station uses five large centrifugal pumps. Three are driven by wound rotor induction motors, and two are driven by synchronous motors. The MAIN reason for this combination is that - Correct Answer-synchronous motors can be used to improve the power factor Assume that the input of a certain motor is 32,000 watts and its losses are 4,000 watts. The efficiency, in percent, of this motor is MOST NEARLY - Correct Answer-87.5 After repairs to the electrical supply, a three phase, 3 wire, AC wound rotor induction motor is found to rotate in the wrong direction. In order to reverse the direction of rotation, it is necessary to - Correct Answer-reverse any two supply lines connected to the stator Assume that several three phase induction motors which are supplied through the same oil circuit breaker all him but will not start, Of the following troubles, the one that is MOST likely to be responsible fro such a situation is - Correct Assume that the power in a balanced three wire, three phase load is measured by the two wattmeter method and is read by means of two wattmeters W1 and W2. If W1/W2 is positive, decreases to zero and then becomes negative, the power factor has changed from - Correct Answer-a value above .5 to a value below .5 Assume that it is required to measure the power in an unbalanced varying three phase, four wire 120/208 volt circuit directly. Of the following sets of instruments, the one indicating the minimum number required for this is - Correct Answer-three wattmeters Assume that a certain standard cartridge fuse is loose in its clips. This will result in the - Correct Answer-clips become hot Assume that the only one of the following instruments is available to measure a certain insulation resistance. Of these, the BEST choice is ____________ resistance - Correct Answer- voltmeter of high If the speed of the prime mover driving the alternator supplying a synchronous motor becomes unstable, the motor will - Correct Answer-hunt The type of meter used to indicate the phase relation between the voltage and the current of an AC circuit is called a - Correct Answer-power factor meter Assume that a circuit breaker equipped with a bellow type plunger time delay relay opens instantaneously an overload although set for a certain time delay during the last inspection. The MOST likely cause is - Correct Answer-air vent wide open Assume that there is unequal heating in a bank of transformers connected wye primary and delta secondary. Of the following troubles, the one which can cause these symptoms is - Correct Answer-ground on one of the primary phase or not sufficient oil in tank Assume that a 3 phase 3 wire 4160 volts system has a balanced three phase load connected to it and the ova of the load is to be measured by means of an ammeter and voltmeter connected through instrument transformers. The CT is rated 200/5 amperes and the PT is rated 4160/20. If the voltmeter reads 100 volts and the ammeter reads 4.8 amperes, the load, in ova, is MOST NEARLY - Correct Answer- 1152 Of the following, the one which is an accurate and convent method of measuring liquid velocity is a - Correct Answer- pitotmeter In a venturi meter, the liquids flows from a large sections into a narrow throat. In such a meter, the flow of liquid from the large section to the throat is ____________ its static pressure ________________. - Correct Answer-accelerated and; is reduced Of the following statements concerning the oiling ring-oiled bearing on a electric motors, the one which is describe the BEST procedure is that ring-oiled bearing should be filled through the - Correct Answer-filler gauge on the side of the bearing housing when the machine is shut down; top when the machine is shut down Assume that a vacuum gauge reads 24" of mercury. This is equivalent to an absolute of MOST NEARLY ____________ p.s.i. - Correct Answer-2.9 case is to prevent - Correct Answer-air from entering the pump through the packing box For a given centrifugal pump, the quality of water delivered will vary _____________ the speed. - Correct Answer-directly as Assume that a given centrifugal pump requires 100 hp when operating at 1000 r.p.m. A required increase in the capacity and the head makes it necessary to operate at 1100 r.p.m. Under these conditions, the required power is MOST NEARLY _____________ H.P. - Correct Answer-133 Assume that two identical centrifugal pumps are operated in series. Under conditions, the ____________ at which they operate together at a given ____________. - Correct Answer- head; capacity is double that for a single pump For a given centrifugal pump, the head will vary - Correct Answer-directly as the square of the speed Of the following, the MAIN purpose of the volute casing on a centrifugal pump is to - Correct Answer-convert its velocity head into pressure Of the following types of pumps, the one NOT generally used as a diesel fuel transfer pump is the _______________ type. - Correct Answer-reciprocating Of the following oils, the one which is the HEAVIEST is S.A.E. - Correct Answer-40 Of the following, a well-planned safety program should NOT be expected to - Correct Answer-compensate for unsafe conditions and procedures Of the following, the one which describes the safest method for using an adjustable wrench is with the open jaw facing __________ on the handle - Correct Answer-the user, pull Of the following basic techniques for preventing accidental injury, the one which is MOST effective is - Correct Answer- eliminate the hazard from the plant Portable electric power tools permanently marked with words double insulated and which have been so listed by the Underwriters' Laboratories, Inc. can be safely used - Correct Answer-without third wire grounding When using a two-section extension ladder with an extended length of 60 feet, the one if the following which is NOT a safe action is - Correct Answer-allow a maximum of 2 feet of overlap Of the following, the type of the fire extinguisher which is NEVER suitable for use on an electrical fire is - Correct Answer- liquefied gas or gas cartridge actuated Assume that a member of your crew has been seriously injured by an accident in the plant. Of the following, the FIRST thing that should be done is - Correct Answer-assist the injured man The direction of rotation of a dc shunt motor can be reversed by reversing - Correct Answer-the field or armature current Assume that the power in a balanced three-phase load is measured by the two wattmeter method and is read by means of two wattmeter, namely W1 and W2. If the power factor of the load is .5 leading - Correct Answer-W1 will read positive and W2 will read zero The current in amperes of a 220 volt 5 H.P., dc motor having an efficiency of 90% is MOST NEARLY - Correct Answer-18.8 A shunt generator having an armature current of 50 amperes, an armature resistance of .05 ohms, and a generated e.m.f. of 222.5 volts will MOST likely have a terminal voltage of ___________ volts. - Correct Answer-220.0 Assume that a 4 pole, 220 volt dc motor has a back e.m.f. of 215 volts and 4 armature paths between terminals. If the field flux per pole is suddenly decreased to one half of its former value, the motor speed, in rpm compared to its original speed will be MOST likely - Correct Answer-doubled The frequency of the voltage generated in a synchronous machine having 8 poles and running at 720 rpm is MOST NEARLY - Correct Answer-48 Assume that a synchronous converter has two slip rings and a direct current voltage of 313 volts between the brushes. The effective alternating voltage between slip rings is MOST NEARLY _____________ volts. - Correct Answer-220 A newly appointed plant engineer attempted to make an emergency repair on a dc motor which had an open armature coil (lap wound) by completely cutting this coil in two and disconnecting it from both commutator bars and then running an insulated jumper large enough to safety carry the current between the two bars. This attempted emergency repair will - Correct Answer-not significantly affect the normal running motor The purpose of full wave rectifiers is to - Correct Answer- produce dc current having an ac ripple of twice the input frequency The temporary production of a substitute for a two phase current so as to obtain a make shift rotating field in starting a single phase motor is called - Correct Answer-phase splitting In a fully charged lead acid storage battery, the active material in this positive plates is - Correct Answer-lead peroxide A heat exchanger commonly located between the low pressure and high pressure cylinder of an air compressor is used to ____________ of the compressor air. - Correct Answer-lower the temperature The one of the following instruments which is used for the determination of the velocity of air in ducts is the - Correct Answer-pitot tube A high tension breaker (4160 Volts) should be equipped with a mechanical interlock which will prevent the breaker from being raised of advanced into, and lowered or withdrawn from, the operating position unless - Correct Answer-it is open Fro the operation of a high tension breaker (4160 volts), the suitable control voltage for BEST performed is usually - Correct Answer-70 to 140 volts dc The equipment on which you would be MOST likely to find an unloader is a(n) - Correct Answer-air compressor The MAIN reason for periodic inspections and testing of equipment in an electrically powered plant is to - Correct Answer-discover minor faults before they have a chance to become significantly serious Assume that an employee calls up to give advance notice of his intentions to be absent the following day. The MOST important information that he should give is - Correct Answer- the reason for his absence The MAIN reason why a plant mechanic who is assigned to service equipment must be able to make proper adjustment and repairs quickly is that - Correct Answer-idle equipment will result in poor plant efficiency and work delays A 1300 volt, three phase system with a grounded neutral has a phase to ground voltage of APPROXIMATELY - Correct Answer-750 A 220 volt, 40 HP induction motor is given an insulation resistance test. the normal value of the insulating resistance, in megohms, for this motor is MOST NEARLY - Correct Answer- 0.2 To increase the range of an ac ammeter, the one of the following which is MOST commonly used is a(n) - Correct Answer-current transformer When batteries are being charged, they should not be exposed to open flames and sparks because of flammability of - Correct Answer-hydrogen Assume that you and your supervisor are on an inspectional tour of the outdoor equipment of the plant and that a co- worker suddenly falls unconscious on the pavement. If on close observation you find that the victim is not breathing, the FIRST of the following things to do is - Correct Answer- administer first aid to restore breathing Assume that one of your men, who has always been efficient, industrious, and conscientious, suddenly becomes lax in his work, makes numerous mistakes, and shuns responsibilities. The cause of such a change - Correct Answer-may have no direst relationship to any changes in the job situation The one of the following types of valves which is GENERALLY used where extremely close regulation of flow is needed is the _______________ valve. - Correct Answer-needle Lubricating oils of mineral origin are refined from ____________ products. - Correct Answer-crude petroleum Light-bodied lubricating oils are MOST commonly used for - Correct Answer-light loads at high speed The one of the following lubricant which is LEAST likely to be attacked by acids is - Correct Answer-graphite In general, non-rising stem gate valves are BEST adaptable for - Correct Answer-place where space is a factor The presence of moisture in insulating oil is undesirable. The percentage of moisture which will reduce the dielectric strength of insulating oil approximately one-half of its dielectric strength when dry is MOST NEARLY ________________ of moisture. - Correct Answer-0.005% It has even brought to your attention that one of the men under your supervision is complaining to fellow co-workers that another man has received an easy assignment through his connections. In this situation, it is BEST to - Correct approach is - Correct Answer-good, because this attitude will promote cooperation In the inspection of relays, the type of trouble generally encountered often depends on then type of relay. The one of the following which is NOT a trouble encountered with an induction-type relay is - Correct Answer-punctured bellows With reference to diesel engines, the one of the following which is NOT a method of scavenging the cylinder is ____________ scavenging. - Correct Answer-vane Direct current motor for BEST performance should have their brushes set on the commutator - Correct Answer-at the neutral point (under load) The PROPER order of event that takes place in a 4 stroke cycle Diesel engine is _____________, and exhaust - Correct Answer-air intake, compression, power expansion The compression ratio of a diesel engine that has no starting ignition device is GENERALLY in the range of - Correct Answer- 11 to 20 The base in a lubricating grease denotes the - Correct Answer- type of soap that is used in its manufacture Of the following set of pipes, the one having a total combined area exactly equal to the area of a 12" diameter pipe is ___________ pipes. - Correct Answer-four 6" Assume that a single phase load takes EI x .8 watts, where E is the line voltage, I the line current, and .8 the power factor. The rating in voltage-amperes of the synchronous condenser needed to raise the power factor to unity MOST NEARLY EI X - Correct Answer-.6 If rubber gloves commonly used on high tension work are found on teat to have pinholes, they - Correct Answer-should be discarded Assume that an engine had no load speed of 1800 rpm and a full load speed of 1650 rpm, The speed regulation of this engine is MOST NEARLY - Correct Answer-9.1% The color of the third wire is used for grounding portable electric power tools is generally - Correct Answer-green A series circuit consists of pure inductance and pure resistance. When an AC voltage is impressed across such a circuit, the _____________ the resistance by the 90 degrees. - Correct Answer-voltage across the inductance leads the voltage across Of the following device, the one which should be used for throttling of water going through it is the _____________ valve. - Correct Answer-globe If the line to line voltage of a wye connected 3 phase system is 220 volts AC and the phase current is 10 amperes, then the total power delivered is MOST NEARLY - Correct Answer-3800 The sensitivity of meter movement is given as 50 micro amperes. This is equivalent to a voltmeter rating of ____________ ohms/volt. - Correct Answer-20,000 Someone suggests that the silver-plated main contacts of a circuit of a circuit breaker be cleaned with fine sandpaper. This suggestion is - Correct Answer-poor, since the useful silver plating would be removed If a multi-scale DC voltmeter reads downscale (goes below zero) when connected across two pins of an electrical connector, it is MOST likely that the - Correct Answer-meter leads are reversed Measurements of illumination in a work area are made with light meters which measure in units of - Correct Answer-foot- candles Assume that new type of circuit breakers and controls are to be installed in the plant where you work. This equipment is to be operated and maintained by you. Of the following, the FIRST step you should take to become familiar with the new equipment is to - Correct Answer-read the instruction books for the equipment Of the following, the BEST way to lift a heavy object is to - Correct Answer-place the feet about shoulder-width apart and slowly bend at the knees to reach down to the object Sparks and open flames should be kept away from storage batteries that are being charged because of the high combustibility of the - Correct Answer-gases being produced A 16-foot wood ladder is to be leaned against a wall. Of the following, the SAFEST distance at which the base of the ladder should be placed form the base of the wall is ___________ feet. - Correct Answer-4 Of the following fittings, the one used to connected two length of conduit in a straight line is a(n) - Correct Answer- coupling If a nut is to be tightened to an exact specified value, the wrench that should be used is a(n) _______________ wrench. - Correct Answer-torque Unloaders are generally found on - Correct Answer-air compressor A compound gauge indicates - Correct Answer-pressure in its per sq inches and vacuum in inches of mercury Of the following, the metal that is used for bearing linings is - Correct Answer-babbitt It has been discovered that the commentator of an electrical machine has developed a flat spot. To remove the flat spot, the - Correct Answer-entire commutator should be ground or turned down until the flat spot is removed The FIRST operation performed on raw sewage as it comes into sewage treatment plant is to - Correct Answer-pass it through screens to remove or break up coarse material The MAIN function of diffusers in sewage treatment plants is to - Correct Answer-release compressed air into the sewage A communicator at a sewage plant is used to - Correct Answer-shred sewage matter that is not removed by screens When the ignition characteristics of a fuel are represented by a cetane number, the fuel is one that is normally used in a - Correct Answer-diesel engine Of the following, a characteristic of a wound rotor AC induction motor is that it - Correct Answer-provides a wide range of speed control Detergents are used in lubricating oils to - Correct Answer- keep insoluble matter in suspension In a four stroke Diesel engine, each piston fires every ____________ of the crankshaft. - Correct Answer-two revolutions An electric motor with pressure grease fittings and relief plugs requires lubrication, A grease gun should be4 connected to each fitting and the grease gun should be pumped until - Correct Answer-grease oozes out from the relief plug hole Of the following, the one which is NOT used for applying grease to a bearing is a(n) - Correct Answer-pressure plug Of the following, the substance that should be used to melt ice on pavement and walkways is called - Correct Answer- calcium chloride On a working drawing, the symbol (shading) given as shown at the right represents - Correct Answer-steel A machine screw is indicated on a drawing as The head is the American Standard type called ___________ head. - Correct Answer-oval The tool that is shown at the right is properly referred to as a(n) ___________ tap. - Correct Answer-bottoming The tool indicated at the right is referred to as an arch punch. This tool should be used to - Correct Answer-make the holes in rubber or leather gasket material Before putting an aerosol container for garbage pickup, it is good practice to - Correct Answer-use out the contents inn normal manner A lantern ring is a type of - Correct Answer-sealing arrangement used to minimize air leakage between a rotating shaft and a sleeve Monel metal is an alloy used for water heaters tanks. It is a combination MAINLY of - Correct Answer-nickel and copper The plumbing fitting shown at the right is called - Correct Answer-Return Bend A galvanized steel plate is a plate with a coating of - Correct Answer-zinc If the barrel of a standard micrometer is rotated through one complete revolution, the gap dimensions is charged by ______________ inch. - Correct Answer-.025 Of the following, the indication that a fluorescent lamp is in need of replacement is that - Correct Answer-the lamp flashes on and off, and there are black coating at the end The one of the following that is recommended for prime- coating bare metal is - Correct Answer-zinc chromate In an electric circuit, a high spot temperature is MOST commonly due to - Correct Answer-a defective connection The MAIN reason for periodic inspections and testing of equipment in an electrically powered plant is to - Correct Answer-discover minor faults before they have a chance to become significantly serious Assume that an employee calls up to give advance notice of his intentions to be absent the following day. The MOST important information that he should give is the - Correct Answer-reasons for his absence The MAIN reason why a stationary engineer who is assigned to service equipment must be able to make proper adjustment and repairs quickly is that - Correct Answer-idle equipment will result in poor plant efficiency and work delays Assume that you see one of your oilers tumble down a long flight of concrete steps and fall heavily on the lower landing. You rush to him and find that he is unconscious but breathing. Of the following, the BEST course of action for you to take is - Correct Answer-do not move him but cover him with a blanket and call a doctor The MAIN reason that larger size electrical cables (such as #0000) are always stranded rather than solid is that they - Correct Answer-are more flexible The purpose of a full wave rectifier is to - Correct Answer- produce DC current having an AC ripple of twice the input frequency The temporary productions of a substitute for a two-phase current skas to obtain a make shift rotating field in starting a single phase motor is called - Correct Answer-phase splitting When batteries are being charged, they should NOT be exposed to open flames and sparks because of the flammability of - Correct Answer-hydrogen Assume that you and your supervisor are on an inspectional tour of the outdoor equipment of the plant and that a co worker suddenly falls unconscious on the pavement. If, on close observation, you find that the victim is not breathing, the FIRST thing to do is - Correct Answer-administer first aid and restore breathing Assume that one of your men, who has always been efficient, industrious, and conscientious, suddenly becomes lax in his work, makes numerous mistakes, and shuns responsibilities. The cause of such a charge - Correct Answer-may have no direct relationships to any change in the job situation Circuit conductors operating at 600 volts of less may be worked upon live, without opening the circuit, id certain precautionary measures are taken. The one of the following that BEST represent one of these precautionary measures for this work is: - Correct Answer-Bare or exposed places on one conductor must be taped before another conductor is exposed In order to properly distribute the load (in proportion to their rated capacities) between two alternators which are operating in parallel, it is necessary to - Correct Answer-under excite the smaller alternator and overexcite the larger one If a large amount of flames is visible from a small pile of burning material, the material must contain a substance that - strength when dy is MOST NEARLY _______________ % of moisture. - Correct Answer-0.005 It has been brought to your attention that one of the men under your supervision is complaining to fellow co workers that another man has received an essay assignment through his connections. In this situation, it is BEST to - Correct Answer-privately inform the man who is complaining of the truth regarding the assignment The direction of rotation of a DC shunt motor can be reversed by reversing the - Correct Answer-line leads The insulation resistance of the stator winding of an induction motor is MOST commonly measured or tested with a(n) - Correct Answer-megger Assume that three 12 ohms resistors are connected in delta across a 208 volt, 3 phase circuit The power, in watts, dissipated in this resistance load will be MOST NEARLY - Correct Answer-17.32 Assume that three 12 ohm resistors are connected in wye across a 208 volt, 3-phase circuit. The power in watts, dissipated in this resistance load will be MOST NEARLY - Correct Answer-3600 The one of the following knots which is MOST commonly used to shorten a rope without cutting it is the - Correct Answer- sheepshank Cast iron casting that need repairing are USUALLY repaired by the process known as - Correct Answer-brazing The term SAE stands for - Correct Answer-Society of Automotive Engineers The type of valve which is generally used where extremely close regulation of flow is needed is the _____________ valve. - Correct Answer-needle Lubricating oils of mineral origin are refined from ____________ products. - Correct Answer-crude petroleum The compression ratio of a Diesel engine that has no starting ignition device is GENERALLY in the range of - Correct Answer- 11 to 20 The base in a lubricating grease denotes the - Correct Answer- dropping or melting point of the grease Of the following sets of pipes, the one having a total combined area EXACTLY equal to the area of a 12" diameter pipe is __________ 6" pipes and __________ 8" pipes - Correct Answer-four; no If rubber gloves commonly used on high tension work are found on testing to have pin holes, they - Correct Answer- should be discarded Of the following types of soap-based greases, the one which has fibrous texture is - Correct Answer-sodium Of the following types of soap-based greases, the one that is BEST for lubricating plain bearing and line shafting is - Correct Answer-calcium