STATIONARY ENGINEER 2026 UPDATED EXAM QUESTIONS
AND SOLUTIONS RATED A+
✔✔With reference to AC motors, in addition to overload, many other things causes
fuses to blow. The fuse will blow if, in starting an AC motor, the operator throws the
starting switch of the compensator to the running position - ✔✔too quickly
✔✔A change in speed of a DC motor of 10 to 15 percent USUALLY be made by -
✔✔increasing or decreasing the gap between the armature and field
✔✔Of the following types of fire extinguishers, the one MOST suitable for use on fires in
electrical equipment is the ____________ extinguisher - ✔✔dry chemical
✔✔Portable fire extinguisher suitable for use on electrical fires are USUALLY identified
by a label with the following symbol __________ in a __________. - ✔✔C; circle
✔✔When flammable liquids are poured form one containers to another, a bond wire is
some-times connected between the containers to - ✔✔eliminate sparks due to static
electricity
✔✔The proper way to lift a heavy object includes all of the following techniques
EXCEPT - ✔✔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 - ✔✔red
✔✔Assume that the contents of a container are described as TOXIC. This means they
are - ✔✔poisonous
✔✔An authoritative source of emergency information on antidotes is the - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔600
✔✔In fully charged lead acid storage battery, the active material of the plates is -
✔✔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 - ✔✔run at half speed
✔✔Of the following, the PRIMARY function of a pyrometer is to measure -
✔✔temperature
✔✔In general, the temperature of a gas or vapor compressor in a limited space will -
✔✔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 - ✔✔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. - ✔✔needle
✔✔Of the following, the one which is NOT part of a safe, well-planned, lockout
procedure is - ✔✔furnish all plant personnel with identical padlocks and keys
✔✔Of the following, the BEST practical way to morale high among the men/women he
supervises is to - ✔✔praise the men/women when they do a good job
✔✔Of the following, the BEST procedure to use when it became necessary to
reprimand a worker is to - ✔✔reprimand him in a private rather than in pubic, even is
you must wait a day
✔✔Assume that you have told one of your men how to do a certain job. While you are
absent, your supervisor checks on the job and gives this man different orders. Of the
following, it would be BEST for you to - ✔✔talk the matter over with your boss privately
✔✔You feel that the morale of your crew would improve if they were permitted to
demonstrate their skills and prove their ability. Of the following, the condition under
, which it is LEAST likely that you will achieve this goal is if they - ✔✔are closely
supervised
✔✔Of the following, the MOST important step in the process of training a worker to
perform a new task is - ✔✔have the worker practice the task under supervision
✔✔Of the following, the one which is NOT a distinguishing feature of the preventive
maintenance program is - ✔✔make only those repairs necessary to get equipment back
into service
✔✔The direction of rotation of a DC shunt motor can be reversed by reversing -
✔✔either the field of the armature connections
✔✔The insulation on high voltage cables must be capable of resisting the gas
sometimes produced by electrical action in a vicinity of high voltage. - ✔✔ozone
✔✔A 5 volt voltmeter has a resistance of 500 ohms. Of the following resistance, the one
which should be placed in series with this instrument in order to measure voltage up to
150 volts is ____________ ohms. - ✔✔14,500
✔✔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 - ✔✔80
✔✔If the voltage between lines in a 3 phase, 4 wire systems is 4160 volts, the voltage
to neutral is MOST NEARLY - ✔✔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 -
✔✔barriers broken
✔✔The term trip-free applies to a circuit breaker that - ✔✔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 - ✔✔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 ____________. - ✔✔before; water
AND SOLUTIONS RATED A+
✔✔With reference to AC motors, in addition to overload, many other things causes
fuses to blow. The fuse will blow if, in starting an AC motor, the operator throws the
starting switch of the compensator to the running position - ✔✔too quickly
✔✔A change in speed of a DC motor of 10 to 15 percent USUALLY be made by -
✔✔increasing or decreasing the gap between the armature and field
✔✔Of the following types of fire extinguishers, the one MOST suitable for use on fires in
electrical equipment is the ____________ extinguisher - ✔✔dry chemical
✔✔Portable fire extinguisher suitable for use on electrical fires are USUALLY identified
by a label with the following symbol __________ in a __________. - ✔✔C; circle
✔✔When flammable liquids are poured form one containers to another, a bond wire is
some-times connected between the containers to - ✔✔eliminate sparks due to static
electricity
✔✔The proper way to lift a heavy object includes all of the following techniques
EXCEPT - ✔✔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 - ✔✔red
✔✔Assume that the contents of a container are described as TOXIC. This means they
are - ✔✔poisonous
✔✔An authoritative source of emergency information on antidotes is the - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔600
✔✔In fully charged lead acid storage battery, the active material of the plates is -
✔✔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 - ✔✔run at half speed
✔✔Of the following, the PRIMARY function of a pyrometer is to measure -
✔✔temperature
✔✔In general, the temperature of a gas or vapor compressor in a limited space will -
✔✔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 - ✔✔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. - ✔✔needle
✔✔Of the following, the one which is NOT part of a safe, well-planned, lockout
procedure is - ✔✔furnish all plant personnel with identical padlocks and keys
✔✔Of the following, the BEST practical way to morale high among the men/women he
supervises is to - ✔✔praise the men/women when they do a good job
✔✔Of the following, the BEST procedure to use when it became necessary to
reprimand a worker is to - ✔✔reprimand him in a private rather than in pubic, even is
you must wait a day
✔✔Assume that you have told one of your men how to do a certain job. While you are
absent, your supervisor checks on the job and gives this man different orders. Of the
following, it would be BEST for you to - ✔✔talk the matter over with your boss privately
✔✔You feel that the morale of your crew would improve if they were permitted to
demonstrate their skills and prove their ability. Of the following, the condition under
, which it is LEAST likely that you will achieve this goal is if they - ✔✔are closely
supervised
✔✔Of the following, the MOST important step in the process of training a worker to
perform a new task is - ✔✔have the worker practice the task under supervision
✔✔Of the following, the one which is NOT a distinguishing feature of the preventive
maintenance program is - ✔✔make only those repairs necessary to get equipment back
into service
✔✔The direction of rotation of a DC shunt motor can be reversed by reversing -
✔✔either the field of the armature connections
✔✔The insulation on high voltage cables must be capable of resisting the gas
sometimes produced by electrical action in a vicinity of high voltage. - ✔✔ozone
✔✔A 5 volt voltmeter has a resistance of 500 ohms. Of the following resistance, the one
which should be placed in series with this instrument in order to measure voltage up to
150 volts is ____________ ohms. - ✔✔14,500
✔✔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 - ✔✔80
✔✔If the voltage between lines in a 3 phase, 4 wire systems is 4160 volts, the voltage
to neutral is MOST NEARLY - ✔✔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 -
✔✔barriers broken
✔✔The term trip-free applies to a circuit breaker that - ✔✔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 - ✔✔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 ____________. - ✔✔before; water
