Power Engineering 4a - Unit 8 - Electrotechnology UPDATED ACTUAL
Questions and CORRECT Answers
Question: When using Fleming's Left Hand Rule, the index finger represents A) generator action flux
direction. B) motor action motion direction. C) generator conductor motion direction. D) motor action flux
direction. E) motor action direction of current flow.
Correct Answer: D
Question: A basic law of electricity is, unlike charges attract each other and like charges A) impact each
other. B) hold each other. C) attract each other. D) are neutralized. E) repel each other.
Correct Answer: E
Question: Some of the hazards of electrical transformer cooling oil can be compensated for by adding A)
chelates. B) anti-foaming substances. C) chlorinated hydrocarbons. D) Freon. E) organic compounds.
Correct Answer: C
Question: Synchronous motors are used to A) improve electrical system power factor. B) bring up
alternators to synchronous speed. C) reduce the power factor for a power system. D) eliminate the need for
a DC power source. E) drive a steam turbine.
Correct Answer: A
Question: A kilowatt-hour meter has a small motor which A) turns at a constant speed. B) slows down as
power consumption increases. C) has a speed proportional to power consumption. D) moves the meter
demand pointer. E) indicates the multiplier to be used when reading the meter.
Correct Answer: C
Question: The best type of diagram for showing electrical supply and distribution systems is the A) process
diagram. B) single line diagram (one line). C) elementary diagram. D) piping diagram. E) terminal and
connection diagram.
Correct Answer: B
Question: In a V one phase, three wire circuit, the color of the circuit conductor that is grounded is A) red.
B) white. C) black. D) blue. E) green.
Correct Answer: B
Question: When disconnecting an alternator from the system, the first step should be A) Open the circuit
breaker first and then reduce the current of the alternator B) Reduce the voltage to zero first and then open
the circuit breaker C) Reduce the alternator current first to zero and then open the main disconnecting
switch. D) Reduce the current first and then reduce the voltage of the alternator E) Reduce the speed of the
alternator first and then open the circuit breaker.
Correct Answer: C
Question: The use of electronic switches can result in excessively high transformer voltages due to a
phenomena called A) capacitive reactance. B) inductive reactance. C) phase lag. D) reactive voltage loss. E)
harmonic distortion.
Correct Answer: E
, Question: A simple step-up transformer has a primary winding of 400 turns and a secondary winding of
1800 turns. If the primary voltage is 440 volts, the voltage at the terminals of the secondary winding will be
A) 880 V. B) 1636 V. C) 1800 V. D) 1980 V. E) 2000 V.
Correct Answer: D
Question: A megohmmeter measures A) amperage. B) megawatts of power. C) resistance. D) voltage drop.
E) current flow.
Correct Answer: C
Question: The following materials have HIGH reluctance (select 3 correct answers)
Correct Answer: A) iron B) glass C) steel D) air E) oil: B, D, E
Question: The connection provided on DC motors to supply the armature with power A) are slip rings. B)
are field poles. C) is a rheostat. D) is a commutator. E) is a rotating conductor.
Correct Answer: D
Question: The common solution for armature reaction on large DC machines is A) To install the interpoles
B) To install large field poles C) To install small field poles D) To laminate the field poles E) To shift the
field poles
Correct Answer: A
Question: When a material or substance does not form a magnetic flux easily it is said to have high A)
permeability. B) resistance. C) reluctance. D) field reactance. E) magnetic flux density.
Correct Answer: C
Question: The brushes used to transfer power from armature are made up of carbon because A) It has high
coefficient of friction and is good conductor of electricity B) It has low coefficient of friction and bad
conductor of electricity C) It has low coefficient of friction and is good conductor of electricity D) It is good
conductor of electricity and easy to replace E) It does not wear out easily
Correct Answer: C
Question: Current flow direction and intensity will A) affect magnetic field direction and intensity. B)
affect the voltage. C) affect the resistance of a circuit. D) not affect electromagnetic field direction. E) not
affect electromagnetic field intensity.
Correct Answer: A
Question: The most common measurement made with a meter is A) amperage. B) wattage. C) resistance.
D) voltage. E) capacitance.
Correct Answer: D
Question: The black demand pointer of a power meter A) moves the red pointer. B) always reads the
current demand. C) resets automatically. D) indicates the amperage being drawn. E) must be manually
reset.
Correct Answer: E
Question: In an electrical distribution system, if one source is lost, power can still be maintained to the
switchboard main bus by means of A) a transformer tap. B) a bus duct. C) a cable tap. D) a fusible
panelboard. E) a tie breaker.
Questions and CORRECT Answers
Question: When using Fleming's Left Hand Rule, the index finger represents A) generator action flux
direction. B) motor action motion direction. C) generator conductor motion direction. D) motor action flux
direction. E) motor action direction of current flow.
Correct Answer: D
Question: A basic law of electricity is, unlike charges attract each other and like charges A) impact each
other. B) hold each other. C) attract each other. D) are neutralized. E) repel each other.
Correct Answer: E
Question: Some of the hazards of electrical transformer cooling oil can be compensated for by adding A)
chelates. B) anti-foaming substances. C) chlorinated hydrocarbons. D) Freon. E) organic compounds.
Correct Answer: C
Question: Synchronous motors are used to A) improve electrical system power factor. B) bring up
alternators to synchronous speed. C) reduce the power factor for a power system. D) eliminate the need for
a DC power source. E) drive a steam turbine.
Correct Answer: A
Question: A kilowatt-hour meter has a small motor which A) turns at a constant speed. B) slows down as
power consumption increases. C) has a speed proportional to power consumption. D) moves the meter
demand pointer. E) indicates the multiplier to be used when reading the meter.
Correct Answer: C
Question: The best type of diagram for showing electrical supply and distribution systems is the A) process
diagram. B) single line diagram (one line). C) elementary diagram. D) piping diagram. E) terminal and
connection diagram.
Correct Answer: B
Question: In a V one phase, three wire circuit, the color of the circuit conductor that is grounded is A) red.
B) white. C) black. D) blue. E) green.
Correct Answer: B
Question: When disconnecting an alternator from the system, the first step should be A) Open the circuit
breaker first and then reduce the current of the alternator B) Reduce the voltage to zero first and then open
the circuit breaker C) Reduce the alternator current first to zero and then open the main disconnecting
switch. D) Reduce the current first and then reduce the voltage of the alternator E) Reduce the speed of the
alternator first and then open the circuit breaker.
Correct Answer: C
Question: The use of electronic switches can result in excessively high transformer voltages due to a
phenomena called A) capacitive reactance. B) inductive reactance. C) phase lag. D) reactive voltage loss. E)
harmonic distortion.
Correct Answer: E
, Question: A simple step-up transformer has a primary winding of 400 turns and a secondary winding of
1800 turns. If the primary voltage is 440 volts, the voltage at the terminals of the secondary winding will be
A) 880 V. B) 1636 V. C) 1800 V. D) 1980 V. E) 2000 V.
Correct Answer: D
Question: A megohmmeter measures A) amperage. B) megawatts of power. C) resistance. D) voltage drop.
E) current flow.
Correct Answer: C
Question: The following materials have HIGH reluctance (select 3 correct answers)
Correct Answer: A) iron B) glass C) steel D) air E) oil: B, D, E
Question: The connection provided on DC motors to supply the armature with power A) are slip rings. B)
are field poles. C) is a rheostat. D) is a commutator. E) is a rotating conductor.
Correct Answer: D
Question: The common solution for armature reaction on large DC machines is A) To install the interpoles
B) To install large field poles C) To install small field poles D) To laminate the field poles E) To shift the
field poles
Correct Answer: A
Question: When a material or substance does not form a magnetic flux easily it is said to have high A)
permeability. B) resistance. C) reluctance. D) field reactance. E) magnetic flux density.
Correct Answer: C
Question: The brushes used to transfer power from armature are made up of carbon because A) It has high
coefficient of friction and is good conductor of electricity B) It has low coefficient of friction and bad
conductor of electricity C) It has low coefficient of friction and is good conductor of electricity D) It is good
conductor of electricity and easy to replace E) It does not wear out easily
Correct Answer: C
Question: Current flow direction and intensity will A) affect magnetic field direction and intensity. B)
affect the voltage. C) affect the resistance of a circuit. D) not affect electromagnetic field direction. E) not
affect electromagnetic field intensity.
Correct Answer: A
Question: The most common measurement made with a meter is A) amperage. B) wattage. C) resistance.
D) voltage. E) capacitance.
Correct Answer: D
Question: The black demand pointer of a power meter A) moves the red pointer. B) always reads the
current demand. C) resets automatically. D) indicates the amperage being drawn. E) must be manually
reset.
Correct Answer: E
Question: In an electrical distribution system, if one source is lost, power can still be maintained to the
switchboard main bus by means of A) a transformer tap. B) a bus duct. C) a cable tap. D) a fusible
panelboard. E) a tie breaker.
