STATIONARY ENGINEER ELECTRIC ACTUAL EXAM | QUESTIONS
AND ANSWERS | VERIFIED ANSWERS (100% CORRECT) | LATEST
EXAM UPDATE
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 -
CORRECT ANSWER- current lags the voltage
The power factor of a load is equal to the ____________ power divided by the
____________ power. - CORRECT 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. - CORRECT 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. - CORRECT 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. - CORRECT 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 - CORRECT 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. - CORRECT 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. - CORRECT
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 - CORRECT ANSWER- Water
A 600 volt cartridge fuse must have knife blade contacts if its current rating
exceeds _____________ amperes. - CORRECT ANSWER- 60
When the magnitude of the short circuit currents in a feeder circuit must be
limited, this is USUALLY accomplished by means of - CORRECT 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 - CORRECT
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 -
CORRECT ANSWER- 1,200
The device commonly known as a growler is FREQUENTLY used to -
CORRECT 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 - CORRECT ANSWER- start at zero
but increase gradually for one of the connections
,The device used to convert direct current to alternating current is called -
CORRECT 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 - CORRECT ANSWER-
Excessively high voltage on the line
The currents in the armature equalizer connections in a DC generator are -
CORRECT 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 -
CORRECT 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. - CORRECT 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 - CORRECT
ANSWER- 6
If the field of a shunt motor opens while running, the motor will - CORRECT
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. - CORRECT ANSWER- shunt field and to the series
A main contributing factor to motor stator failure usually is - CORRECT
ANSWER- dirt
, The input of a motor is 40,000 watts and efficiency is 80 percent. The TOTAL
energy loss is __________ watts. - CORRECT 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. - CORRECT ANSWER- 14.4
Of the following motors, the one that has the best speed regulation is the motor.
- CORRECT 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 -
CORRECT ANSWER- 1080
Of the following, a MAJOR advantage of an AC synchronous motor is that it(s)
- CORRECT 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 - CORRECT 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 - CORRECT ANSWER- KVA rating
A transformer rates at 200 KVA is FULLY loaded with a lagging power factor of
80% when it is supplying - CORRECT ANSWER- 160 KW
If the current in the primary of a current transformer is 500 amperes and the
transformer has a ratio of 100 to 5, an ammeter connected to the secondary will
read MOST NEARLY___________ amperes. - CORRECT ANSWER- 25
AND ANSWERS | VERIFIED ANSWERS (100% CORRECT) | LATEST
EXAM UPDATE
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 -
CORRECT ANSWER- current lags the voltage
The power factor of a load is equal to the ____________ power divided by the
____________ power. - CORRECT 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. - CORRECT 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. - CORRECT 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. - CORRECT 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 - CORRECT 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. - CORRECT 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. - CORRECT
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 - CORRECT ANSWER- Water
A 600 volt cartridge fuse must have knife blade contacts if its current rating
exceeds _____________ amperes. - CORRECT ANSWER- 60
When the magnitude of the short circuit currents in a feeder circuit must be
limited, this is USUALLY accomplished by means of - CORRECT 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 - CORRECT
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 -
CORRECT ANSWER- 1,200
The device commonly known as a growler is FREQUENTLY used to -
CORRECT 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 - CORRECT ANSWER- start at zero
but increase gradually for one of the connections
,The device used to convert direct current to alternating current is called -
CORRECT 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 - CORRECT ANSWER-
Excessively high voltage on the line
The currents in the armature equalizer connections in a DC generator are -
CORRECT 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 -
CORRECT 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. - CORRECT 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 - CORRECT
ANSWER- 6
If the field of a shunt motor opens while running, the motor will - CORRECT
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. - CORRECT ANSWER- shunt field and to the series
A main contributing factor to motor stator failure usually is - CORRECT
ANSWER- dirt
, The input of a motor is 40,000 watts and efficiency is 80 percent. The TOTAL
energy loss is __________ watts. - CORRECT 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. - CORRECT ANSWER- 14.4
Of the following motors, the one that has the best speed regulation is the motor.
- CORRECT 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 -
CORRECT ANSWER- 1080
Of the following, a MAJOR advantage of an AC synchronous motor is that it(s)
- CORRECT 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 - CORRECT 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 - CORRECT ANSWER- KVA rating
A transformer rates at 200 KVA is FULLY loaded with a lagging power factor of
80% when it is supplying - CORRECT ANSWER- 160 KW
If the current in the primary of a current transformer is 500 amperes and the
transformer has a ratio of 100 to 5, an ammeter connected to the secondary will
read MOST NEARLY___________ amperes. - CORRECT ANSWER- 25
