STATIONARY ENGINEER 2026 TEST PAPER QUESTIONS
AND SOLUTIONS RATED A+
✔✔If the speed of the prime mover driving the alternator supplying a synchronous motor
becomes unstable, the motor will - ✔✔hunt
✔✔The type of meter used to indicate the phase relation between the voltage and the
current of an AC circuit is called a - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔1152
✔✔Of the following, the one which is an accurate and convent method of measuring
liquid velocity is a - ✔✔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 ________________. - ✔✔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 - ✔✔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. - ✔✔2.9
✔✔Of the following, the one which BEST describes the function of a pony brake is -
✔✔measure the power output of motor
,✔✔Assume that a spur gear having 60 teeth revolves at 720 r.p.m that drives another
spur gear having 80 teeth. The speed, in r.p.m., at which the gear having 80 teeth
revolves will be - ✔✔540
✔✔In a ordering description for a 6" gate valve shall be: I.B.B.M, O.S.&Y, and F.E. Of
the following, the one that MOST NEARY defines these abbreviations is iron - ✔✔body
brass mounted, open stem and yoke, flanged end
✔✔The surge caused by sudden opening or closing of valves in a closed liquid piping
system is USUALLY called - ✔✔water hammer
✔✔Of the following, the MOST likely location for an after-cooler on a super-charged
dual fuel Diesel engine is - ✔✔between the turbocharger and the intake manifold
✔✔Dual-fuel diesel engines USUALLY require - ✔✔pilot injection of liquid fuel to initiate
ignition
✔✔Assume that an engine has a no-load speed of 370 r.p.m. and a full load speed of
360 r.p.m. The speed regulation of this engine is MOST NEARLY - ✔✔2.75%
✔✔Assume that 60,000 gym of water at 60F are to raised through a lift of 33 feet. If the
efficiency of the pump is 50% and a gallon of water weighs 8.3 pounds, then the
horsepower required to drive the pump is MOST NEARLY - ✔✔1000
✔✔Assume that a certain pumping station has three pumps A,B, and C. A can pump
1000 gallons in 6 minutes, B can pump 1000 gallons in 3 minutes, and C can pump
1000 gallons in 2 minutes. The time required for all three pumps, working at the same
time, to pump 1000 gallons is MOST NEARLY _____________ minute(s). - ✔✔1
✔✔Assume that a centrifugal pump that is used to pump that is used to pump water
seal ring in its stuffing box. Of the following, the MAIN purpose of the water seal ring in
such a case is to prevent - ✔✔air from entering the pump through the packing box
✔✔For a given centrifugal pump, the quality of water delivered will vary _____________
the speed. - ✔✔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. - ✔✔133
, ✔✔Assume that two identical centrifugal pumps are operated in series. Under
conditions, the ____________ at which they operate together at a given ____________.
- ✔✔head; capacity is double that for a single pump
✔✔For a given centrifugal pump, the head will vary - ✔✔directly as the square of the
speed
✔✔Of the following, the MAIN purpose of the volute casing on a centrifugal pump is to -
✔✔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. - ✔✔reciprocating
✔✔Of the following oils, the one which is the HEAVIEST is S.A.E. - ✔✔40
✔✔Of the following, a well-planned safety program should NOT be expected to -
✔✔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 - ✔✔the user, pull
✔✔Of the following basic techniques for preventing accidental injury, the one which is
MOST effective is - ✔✔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 -
✔✔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 - ✔✔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 - ✔✔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 - ✔✔assist the injured
man
✔✔The direction of rotation of a dc shunt motor can be reversed by reversing - ✔✔the
field or armature current
AND SOLUTIONS RATED A+
✔✔If the speed of the prime mover driving the alternator supplying a synchronous motor
becomes unstable, the motor will - ✔✔hunt
✔✔The type of meter used to indicate the phase relation between the voltage and the
current of an AC circuit is called a - ✔✔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 - ✔✔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 - ✔✔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 - ✔✔1152
✔✔Of the following, the one which is an accurate and convent method of measuring
liquid velocity is a - ✔✔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 ________________. - ✔✔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 - ✔✔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. - ✔✔2.9
✔✔Of the following, the one which BEST describes the function of a pony brake is -
✔✔measure the power output of motor
,✔✔Assume that a spur gear having 60 teeth revolves at 720 r.p.m that drives another
spur gear having 80 teeth. The speed, in r.p.m., at which the gear having 80 teeth
revolves will be - ✔✔540
✔✔In a ordering description for a 6" gate valve shall be: I.B.B.M, O.S.&Y, and F.E. Of
the following, the one that MOST NEARY defines these abbreviations is iron - ✔✔body
brass mounted, open stem and yoke, flanged end
✔✔The surge caused by sudden opening or closing of valves in a closed liquid piping
system is USUALLY called - ✔✔water hammer
✔✔Of the following, the MOST likely location for an after-cooler on a super-charged
dual fuel Diesel engine is - ✔✔between the turbocharger and the intake manifold
✔✔Dual-fuel diesel engines USUALLY require - ✔✔pilot injection of liquid fuel to initiate
ignition
✔✔Assume that an engine has a no-load speed of 370 r.p.m. and a full load speed of
360 r.p.m. The speed regulation of this engine is MOST NEARLY - ✔✔2.75%
✔✔Assume that 60,000 gym of water at 60F are to raised through a lift of 33 feet. If the
efficiency of the pump is 50% and a gallon of water weighs 8.3 pounds, then the
horsepower required to drive the pump is MOST NEARLY - ✔✔1000
✔✔Assume that a certain pumping station has three pumps A,B, and C. A can pump
1000 gallons in 6 minutes, B can pump 1000 gallons in 3 minutes, and C can pump
1000 gallons in 2 minutes. The time required for all three pumps, working at the same
time, to pump 1000 gallons is MOST NEARLY _____________ minute(s). - ✔✔1
✔✔Assume that a centrifugal pump that is used to pump that is used to pump water
seal ring in its stuffing box. Of the following, the MAIN purpose of the water seal ring in
such a case is to prevent - ✔✔air from entering the pump through the packing box
✔✔For a given centrifugal pump, the quality of water delivered will vary _____________
the speed. - ✔✔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. - ✔✔133
, ✔✔Assume that two identical centrifugal pumps are operated in series. Under
conditions, the ____________ at which they operate together at a given ____________.
- ✔✔head; capacity is double that for a single pump
✔✔For a given centrifugal pump, the head will vary - ✔✔directly as the square of the
speed
✔✔Of the following, the MAIN purpose of the volute casing on a centrifugal pump is to -
✔✔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. - ✔✔reciprocating
✔✔Of the following oils, the one which is the HEAVIEST is S.A.E. - ✔✔40
✔✔Of the following, a well-planned safety program should NOT be expected to -
✔✔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 - ✔✔the user, pull
✔✔Of the following basic techniques for preventing accidental injury, the one which is
MOST effective is - ✔✔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 -
✔✔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 - ✔✔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 - ✔✔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 - ✔✔assist the injured
man
✔✔The direction of rotation of a dc shunt motor can be reversed by reversing - ✔✔the
field or armature current
