STATIONARY ENGINEER ELECTRIC EXAM
WITH QUESTIONS AND ANSWERS|| LATEST
VERSION 2026
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 -
ANSWER-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 - ANSWER-
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). - ANSWER-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 - ANSWER-air from entering the pump
through the packing box
For a given centrifugal pump, the quality of water delivered will vary
_____________ the speed. - 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. - ANSWER-133
Assume that two identical centrifugal pumps are operated in series. Under
conditions, the ____________ at which they operate together at a given
____________. - ANSWER-head; capacity is double that for a single pump
For a given centrifugal pump, the head will vary - ANSWER-directly as the
square of the speed
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. - 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. - 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 - ANSWER-3800
The sensitivity of meter movement is given as 50 micro amperes. This is
equivalent to a voltmeter rating of ____________ ohms/volt. - ANSWER-
20,000
Doubling the number of turns of an inductor should _____________ its original
value. - ANSWER-increase the inductance to four times
Electrical fuse are rated in - ANSWER-current and voltage
,A 30 ohms resistor is placed in parallel with an inductor that has an inductive
reactance of 40 ohms. If 120 volts AC is impressed across the parallel
combination, the total current drawn from the 120 volt AC line is
____________ amps. - ANSWER-5.0
The symbol shown at the right, found in the schematic of a motor control circuit
represent a - ANSWER-silicon-controlled rectifier
A device that can be used to check the conditions o the electrolyte in a storage
battery is the - ANSWER-hydrometer
Of the following, the BEST device to use to check the conditions of the
insulation of a cable is the - ANSWER-megger
The decibel is a unit used in measuring the level of - ANSWER-sound
A rectangle bus bar with a cross section of 1.0 inch x .50 inch has a cross
sectional area MOST NEARLY equivalent to _____________ circular mils. -
ANSWER-640,000
The electrical conductivity of copper is lower than that of - ANSWER-silver
The horsepower of a fan varies as the ___________ of the fan speed -
ANSWER-cube
The gear for transmitting power between two shaft at right angles to each other
consists of two essential parts: - ANSWER-two bevel gears
If a transmission main drive gear, having 30 teeth
, rotates at 400 rpm and drives a counter shaft gear at 300 rpm, the total number
of teeth on the countershaft drive will be - ANSWER-40
, The one of the following faults of a C.B. main contact which is NOT a cause of
overheating of air circuit breakers is - ANSWER-excessive pressure
The MAIN reason that large size electrical cables (such as #0000) are always
stranded rather than solid is that they - ANSWER-are more flexible
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 - ANSWER-do not move him but cover him with a blanket and call a
doctor
It is sometimes desirable to have a control that will cause a dc motor to come to
a standstill quickly instead of coasting to a standstill after the stop button is
pressed. This result is MOST commonly obtained by means of an action called -
ANSWER-dynamic braking
In an electric circuit, a high-spot-temperature is MOST commonly due to -
ANSWER-a defective connection
The MAIN reason for periodic inspections and testing of equipment in an
electrically powered plant is to - 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 - 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 - ANSWER-
idle equipment will result in poor plant efficiency and work delays
WITH QUESTIONS AND ANSWERS|| LATEST
VERSION 2026
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 -
ANSWER-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 - ANSWER-
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). - ANSWER-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 - ANSWER-air from entering the pump
through the packing box
For a given centrifugal pump, the quality of water delivered will vary
_____________ the speed. - 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. - ANSWER-133
Assume that two identical centrifugal pumps are operated in series. Under
conditions, the ____________ at which they operate together at a given
____________. - ANSWER-head; capacity is double that for a single pump
For a given centrifugal pump, the head will vary - ANSWER-directly as the
square of the speed
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. - 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. - 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 - ANSWER-3800
The sensitivity of meter movement is given as 50 micro amperes. This is
equivalent to a voltmeter rating of ____________ ohms/volt. - ANSWER-
20,000
Doubling the number of turns of an inductor should _____________ its original
value. - ANSWER-increase the inductance to four times
Electrical fuse are rated in - ANSWER-current and voltage
,A 30 ohms resistor is placed in parallel with an inductor that has an inductive
reactance of 40 ohms. If 120 volts AC is impressed across the parallel
combination, the total current drawn from the 120 volt AC line is
____________ amps. - ANSWER-5.0
The symbol shown at the right, found in the schematic of a motor control circuit
represent a - ANSWER-silicon-controlled rectifier
A device that can be used to check the conditions o the electrolyte in a storage
battery is the - ANSWER-hydrometer
Of the following, the BEST device to use to check the conditions of the
insulation of a cable is the - ANSWER-megger
The decibel is a unit used in measuring the level of - ANSWER-sound
A rectangle bus bar with a cross section of 1.0 inch x .50 inch has a cross
sectional area MOST NEARLY equivalent to _____________ circular mils. -
ANSWER-640,000
The electrical conductivity of copper is lower than that of - ANSWER-silver
The horsepower of a fan varies as the ___________ of the fan speed -
ANSWER-cube
The gear for transmitting power between two shaft at right angles to each other
consists of two essential parts: - ANSWER-two bevel gears
If a transmission main drive gear, having 30 teeth
, rotates at 400 rpm and drives a counter shaft gear at 300 rpm, the total number
of teeth on the countershaft drive will be - ANSWER-40
, The one of the following faults of a C.B. main contact which is NOT a cause of
overheating of air circuit breakers is - ANSWER-excessive pressure
The MAIN reason that large size electrical cables (such as #0000) are always
stranded rather than solid is that they - ANSWER-are more flexible
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 - ANSWER-do not move him but cover him with a blanket and call a
doctor
It is sometimes desirable to have a control that will cause a dc motor to come to
a standstill quickly instead of coasting to a standstill after the stop button is
pressed. This result is MOST commonly obtained by means of an action called -
ANSWER-dynamic braking
In an electric circuit, a high-spot-temperature is MOST commonly due to -
ANSWER-a defective connection
The MAIN reason for periodic inspections and testing of equipment in an
electrically powered plant is to - 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 - 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 - ANSWER-
idle equipment will result in poor plant efficiency and work delays
