STATIONARY ENGINEER EXAM (2025–2026), BOILER AND STEAM PLANT OPERATIONS –
COMPLETE MULTIPLE-CHOICE PRACTICE EXAM AND CERTIFICATION STUDY GUIDE
1. An AC circuit consists only of a pure inductance and a power source. The re-
lationship between the voltage and the current in this circuit is that the: current
lags the voltage
2. The power factor of a load is equal to the power divided by the
power.: True ; apparent
3. A 10-ohms and 20-ohms resistor are connected in parallel. The total line cur-
rent drawn by this parallel combination is 30 amps. Under these conditions,
the line voltage will be volts.: 200
4. 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.: 100
5. 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.: 12
6. If the voltage between lines of a 3-phase, 3-wire delta connected system is
2400 volts, then the phase voltage is volts: 2400
7. 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.: 4
8. 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.: 6.9
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: Water
10. A 600 volt cartridge fuse must have knife blade contacts if its current rating
exceeds amperes.: 60
11. When the magnitude of the short circuit currents in a feeder circuit must
be limited, this is USUALLY accomplished by means of: reactors
12. 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: 300,000
, STATIONARY ENGINEER EXAM (2025–2026), BOILER AND STEAM PLANT OPERATIONS –
COMPLETE MULTIPLE-CHOICE PRACTICE EXAM AND CERTIFICATION STUDY GUIDE
13. 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: 1,200
14. The device commonly known as a growler is FREQUENTLY used to: test DC
armature windings for shorts
15. When a megger is applied alternately to the two leads of a direct current
electrolytic capacitor, the reading will: start at zero but increase gradually for one of the connec-
tions
16. The device used to convert direct current to alternating current is called: -
inverters
17. Of the following conditions, the one which is MOST likely to cause flashing
or excessive arcing from brush to brush in a motor is: Excessively high voltage on the line
18. The currents in the armature equalizer connections in a DC generator
are: alternating currents
19. A generating station has one 1000 Kw and two 2000 Kw generators. To
supply 2000 Kw MOST economically, the operating conditions should be: one
2000 Kw generator at full load
20. 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.: 220
21. 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: 6
22. If the field of a shunt motor opens while running, the motor will: run away
23. 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.: shunt field and to the series
24. A main contributing factor to motor stator failure usually is: dirt
25. The input of a motor is 40,000 watts and efficiency is 80 percent. The TOTAL
energy loss is watts.: 8,000
26. 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.: 14.4
, STATIONARY ENGINEER EXAM (2025–2026), BOILER AND STEAM PLANT OPERATIONS –
COMPLETE MULTIPLE-CHOICE PRACTICE EXAM AND CERTIFICATION STUDY GUIDE
27. Of the following motors, the one that has the best speed regulation is the
motor.: shunt
28. 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: 1080
29. Of the following, a MAJOR advantage of an AC synchronous motor is that
it(s): can be used for power factor correction
30. If the field current of a synchronous motor is increased to a point which
makes the synchronous motor overexcited, the: motor will take a leading current
31. When transformers are to be operated in parallel, it is NOT necessary that
the transformer have the same: KVA rating
32. A transformer rates at 200 KVA is FULLY loaded with a lagging power factor
of 80% when it is supplying: 160 KW
33. 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.: 25
34. Assume that a switchboard ammeter which is connected to a current trans-
former is damaged and must be removed without interrupting the service. Of
the following, an ESSENTIAL precaution to be taken before disconnecting the
ammeter is to: short the secondary of the transformer
35. A DC relay is rated at 6 volts and 120 ohms. This relay can be operated from
a 120 volt line by connecting a ohm resistance in with
relay: 2280: series
36. Some relays are provided with dash-pots. The FUNCTION of these
dash-pots is to provide: delayed time action
37. An ammeter has a full scale deflection for a current of 0.01 amperes and an
internal resistance of 20 ohms. In order to have the ammeter read full-scale
for a current of 10 amperes and not damage its movement, a shunt should
be used having a value of ohms.: 0.02
38. An air circuit breaker has contacts that flash. The MOST probable cause of
this trouble is that the: barriers are broken
39. The MAIN purpose of a shunt trip on a circuit breaker is to: permit the breaker to
be opened electrically from a remote location, regardless of load conditions at the breaker
COMPLETE MULTIPLE-CHOICE PRACTICE EXAM AND CERTIFICATION STUDY GUIDE
1. An AC circuit consists only of a pure inductance and a power source. The re-
lationship between the voltage and the current in this circuit is that the: current
lags the voltage
2. The power factor of a load is equal to the power divided by the
power.: True ; apparent
3. A 10-ohms and 20-ohms resistor are connected in parallel. The total line cur-
rent drawn by this parallel combination is 30 amps. Under these conditions,
the line voltage will be volts.: 200
4. 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.: 100
5. 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.: 12
6. If the voltage between lines of a 3-phase, 3-wire delta connected system is
2400 volts, then the phase voltage is volts: 2400
7. 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.: 4
8. 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.: 6.9
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: Water
10. A 600 volt cartridge fuse must have knife blade contacts if its current rating
exceeds amperes.: 60
11. When the magnitude of the short circuit currents in a feeder circuit must
be limited, this is USUALLY accomplished by means of: reactors
12. 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: 300,000
, STATIONARY ENGINEER EXAM (2025–2026), BOILER AND STEAM PLANT OPERATIONS –
COMPLETE MULTIPLE-CHOICE PRACTICE EXAM AND CERTIFICATION STUDY GUIDE
13. 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: 1,200
14. The device commonly known as a growler is FREQUENTLY used to: test DC
armature windings for shorts
15. When a megger is applied alternately to the two leads of a direct current
electrolytic capacitor, the reading will: start at zero but increase gradually for one of the connec-
tions
16. The device used to convert direct current to alternating current is called: -
inverters
17. Of the following conditions, the one which is MOST likely to cause flashing
or excessive arcing from brush to brush in a motor is: Excessively high voltage on the line
18. The currents in the armature equalizer connections in a DC generator
are: alternating currents
19. A generating station has one 1000 Kw and two 2000 Kw generators. To
supply 2000 Kw MOST economically, the operating conditions should be: one
2000 Kw generator at full load
20. 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.: 220
21. 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: 6
22. If the field of a shunt motor opens while running, the motor will: run away
23. 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.: shunt field and to the series
24. A main contributing factor to motor stator failure usually is: dirt
25. The input of a motor is 40,000 watts and efficiency is 80 percent. The TOTAL
energy loss is watts.: 8,000
26. 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.: 14.4
, STATIONARY ENGINEER EXAM (2025–2026), BOILER AND STEAM PLANT OPERATIONS –
COMPLETE MULTIPLE-CHOICE PRACTICE EXAM AND CERTIFICATION STUDY GUIDE
27. Of the following motors, the one that has the best speed regulation is the
motor.: shunt
28. 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: 1080
29. Of the following, a MAJOR advantage of an AC synchronous motor is that
it(s): can be used for power factor correction
30. If the field current of a synchronous motor is increased to a point which
makes the synchronous motor overexcited, the: motor will take a leading current
31. When transformers are to be operated in parallel, it is NOT necessary that
the transformer have the same: KVA rating
32. A transformer rates at 200 KVA is FULLY loaded with a lagging power factor
of 80% when it is supplying: 160 KW
33. 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.: 25
34. Assume that a switchboard ammeter which is connected to a current trans-
former is damaged and must be removed without interrupting the service. Of
the following, an ESSENTIAL precaution to be taken before disconnecting the
ammeter is to: short the secondary of the transformer
35. A DC relay is rated at 6 volts and 120 ohms. This relay can be operated from
a 120 volt line by connecting a ohm resistance in with
relay: 2280: series
36. Some relays are provided with dash-pots. The FUNCTION of these
dash-pots is to provide: delayed time action
37. An ammeter has a full scale deflection for a current of 0.01 amperes and an
internal resistance of 20 ohms. In order to have the ammeter read full-scale
for a current of 10 amperes and not damage its movement, a shunt should
be used having a value of ohms.: 0.02
38. An air circuit breaker has contacts that flash. The MOST probable cause of
this trouble is that the: barriers are broken
39. The MAIN purpose of a shunt trip on a circuit breaker is to: permit the breaker to
be opened electrically from a remote location, regardless of load conditions at the breaker
