STATIONARY ENGINEER ELECTRIC EXAM (LATEST 2024/ 2025
UPDATE) WITH QUESTIONS AND VERIFIED ANSWERS| | 100%
CORRECT | GRADE A+
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
UPDATE) WITH QUESTIONS AND VERIFIED ANSWERS| | 100%
CORRECT | GRADE A+
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
