Stationary Engineering Competency Exam: Diesel Engine Compression Cycles,
Hydrostatic Tank Testing, Cetane Ratings, Wound Rotor AC Motors, Lubrication &
Detergent Applications, Four-Stroke Firing Intervals, Grease Fittings & Relief Plug
Operations, Calcium Chloride Deicing, Steel & Monel Alloy Identification,
Micrometer Calibration, Fluorescent Lamp Diagnostics, Zinc Chromate Priming,
Grinding Wheel Dressing, Fusible Metal Plugs, PVC Conduit & Electrical
Insulation, Centrifugal Pump Cavitation, Bolt Thread Travel, Growler Testing,
Dynamic Braking, Hydrogen Safety, DC & AC Motor Operations, Pitot Tube
Airflow Measurement, High-Tension Breaker Interlocks, CO₂ Fire Suppression,
Steam Engine Lubrication, Saybolt & SAE Oil Standards, Needle Valve Precision,
Worm Gear Oil Selection, Fan Affinity Laws, and Bevel Gear Power Transmission
Exam Questions Verified and Provided with Complete A+ Graded Rationales
Latest Updated 2026
The power factor of a load is equal to the ____________ power divided by the ____________
power.
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.
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.
,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.
12
If the voltage between lines of a 3-phase, 3-wire delta connected system is 2400 volts, then the
phase voltage is _____________ volts
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.
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.
6
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
,A 600 volt cartridge fuse must have knife blade contacts if its current rating exceeds
_____________ amperes.
60
When the magnitude of the short circuit currents in a feeder circuit must be limited, this is
USUALLY accomplished by means of
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
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
1,200
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
current lags the voltage
The device commonly known as a growler is FREQUENTLY used to
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
start at zero but increase gradually for one of the connections
The device used to convert direct current to alternating current is called
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
Excessively high voltage on the line
The currents in the armature equalizer connections in a DC generator are
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
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.
Hydrostatic Tank Testing, Cetane Ratings, Wound Rotor AC Motors, Lubrication &
Detergent Applications, Four-Stroke Firing Intervals, Grease Fittings & Relief Plug
Operations, Calcium Chloride Deicing, Steel & Monel Alloy Identification,
Micrometer Calibration, Fluorescent Lamp Diagnostics, Zinc Chromate Priming,
Grinding Wheel Dressing, Fusible Metal Plugs, PVC Conduit & Electrical
Insulation, Centrifugal Pump Cavitation, Bolt Thread Travel, Growler Testing,
Dynamic Braking, Hydrogen Safety, DC & AC Motor Operations, Pitot Tube
Airflow Measurement, High-Tension Breaker Interlocks, CO₂ Fire Suppression,
Steam Engine Lubrication, Saybolt & SAE Oil Standards, Needle Valve Precision,
Worm Gear Oil Selection, Fan Affinity Laws, and Bevel Gear Power Transmission
Exam Questions Verified and Provided with Complete A+ Graded Rationales
Latest Updated 2026
The power factor of a load is equal to the ____________ power divided by the ____________
power.
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.
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.
,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.
12
If the voltage between lines of a 3-phase, 3-wire delta connected system is 2400 volts, then the
phase voltage is _____________ volts
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.
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.
6
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
,A 600 volt cartridge fuse must have knife blade contacts if its current rating exceeds
_____________ amperes.
60
When the magnitude of the short circuit currents in a feeder circuit must be limited, this is
USUALLY accomplished by means of
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
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
1,200
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
current lags the voltage
The device commonly known as a growler is FREQUENTLY used to
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
start at zero but increase gradually for one of the connections
The device used to convert direct current to alternating current is called
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
Excessively high voltage on the line
The currents in the armature equalizer connections in a DC generator are
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
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.
