Stationary Engineer Electric Exam |
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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 - Answer✅✅current
lags the voltage
The power factor of a load is equal to the ____________ power divided by the
____________ power. - 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. - 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. - 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. - 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 - 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. - 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. - 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 -
Answer✅✅Water
A 600 volt cartridge fuse must have knife blade contacts if its current rating exceeds
_____________ amperes. - Answer✅✅60
When the magnitude of the short circuit currents in a feeder circuit must be limited,
this is USUALLY accomplished by means of - Answer✅✅reactors
The cross sectional area in circular mils of a standard cable having 37 strands, each
of which ha a diameter of 90 nils, is MOST NEARLY - Answer✅✅300,000
A coil having an average diameter of 4 inches is to be made up from a 1,260 ft long
length of wire. The numbers of turns in this coil will be MOST NEARLY -
Answer✅✅1,200
The device commonly known as a growler is FREQUENTLY used to - Answer✅✅test
DC armature windings for shorts
When a megger is applied alternately to the two leads of a direct current electrolytic
capacitor, the reading will - Answer✅✅start at zero but increase gradually for one
of the connections
The device used to convert direct current to alternating current is called -
Answer✅✅inverters
Of the following conditions, the one which is MOST likely to cause flashing or
excessive arcing from brush to brush in a motor is - Answer✅✅Excessively high
voltage on the line
The currents in the armature equalizer connections in a DC generator are -
Answer✅✅alternating currents
, A generating station has one 1000 Kw and two 2000 Kw generators. To supply 2000
Kw MOST economically, the operating conditions should be - Answer✅✅one 2000
Kw generator at full load
The terminal voltage of a DC shunt generator having an armature current of 100
amperes, an armature resistance of 0.02 ohms, and a generated E.M.F of 222 volts is
MOST NEARLY ______________ volts. - Answer✅✅220
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 - Answer✅✅6
If the field of a shunt motor opens while running, the motor will - 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. - Answer✅✅shunt field and to the series
A main contributing factor to motor stator failure usually is - Answer✅✅dirt
The input of a motor is 40,000 watts and efficiency is 80 percent. The TOTAL energy
loss is __________ watts. - 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. - Answer✅✅14.4
Of the following motors, the one that has the best speed regulation is the motor. -
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 -
Answer✅✅1080
Of the following, a MAJOR advantage of an AC synchronous motor is that it(s) -
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 - 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 - Answer✅✅KVA rating
A transformer rates at 200 KVA is FULLY loaded with a lagging power factor of 80%
when it is supplying - Answer✅✅160 KW
Brand new Expert Exam Questions
with Clear Correct Verified
Answers| All Graded A+| Latest
Premium Update(2025-2026)|
100% Guaranteed Success.
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 - Answer✅✅current
lags the voltage
The power factor of a load is equal to the ____________ power divided by the
____________ power. - 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. - 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. - 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. - 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 - 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. - 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. - 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 -
Answer✅✅Water
A 600 volt cartridge fuse must have knife blade contacts if its current rating exceeds
_____________ amperes. - Answer✅✅60
When the magnitude of the short circuit currents in a feeder circuit must be limited,
this is USUALLY accomplished by means of - Answer✅✅reactors
The cross sectional area in circular mils of a standard cable having 37 strands, each
of which ha a diameter of 90 nils, is MOST NEARLY - Answer✅✅300,000
A coil having an average diameter of 4 inches is to be made up from a 1,260 ft long
length of wire. The numbers of turns in this coil will be MOST NEARLY -
Answer✅✅1,200
The device commonly known as a growler is FREQUENTLY used to - Answer✅✅test
DC armature windings for shorts
When a megger is applied alternately to the two leads of a direct current electrolytic
capacitor, the reading will - Answer✅✅start at zero but increase gradually for one
of the connections
The device used to convert direct current to alternating current is called -
Answer✅✅inverters
Of the following conditions, the one which is MOST likely to cause flashing or
excessive arcing from brush to brush in a motor is - Answer✅✅Excessively high
voltage on the line
The currents in the armature equalizer connections in a DC generator are -
Answer✅✅alternating currents
, A generating station has one 1000 Kw and two 2000 Kw generators. To supply 2000
Kw MOST economically, the operating conditions should be - Answer✅✅one 2000
Kw generator at full load
The terminal voltage of a DC shunt generator having an armature current of 100
amperes, an armature resistance of 0.02 ohms, and a generated E.M.F of 222 volts is
MOST NEARLY ______________ volts. - Answer✅✅220
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 - Answer✅✅6
If the field of a shunt motor opens while running, the motor will - 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. - Answer✅✅shunt field and to the series
A main contributing factor to motor stator failure usually is - Answer✅✅dirt
The input of a motor is 40,000 watts and efficiency is 80 percent. The TOTAL energy
loss is __________ watts. - 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. - Answer✅✅14.4
Of the following motors, the one that has the best speed regulation is the motor. -
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 -
Answer✅✅1080
Of the following, a MAJOR advantage of an AC synchronous motor is that it(s) -
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 - 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 - Answer✅✅KVA rating
A transformer rates at 200 KVA is FULLY loaded with a lagging power factor of 80%
when it is supplying - Answer✅✅160 KW
