Power Engineering 4a - Unit 8 – Electrotechnology Test with Answers
When using Fleming's Left Hand Rule, the index finger
represents
A) generator action flux direction.
B) motor action motion direction. D
C) generator conductor motion direction.
D) motor action flux direction.
E) motor action direction of current flow.
A basic law of electricity is, unlike charges attract each
other and like charges
A) impact each other.
B) hold each other. E
C) attract each other.
D) are neutralized.
E) repel each other.
Some of the hazards of electrical transformer cooling oil
can be compensated for by adding
A) chelates.
B) anti-foaming substances. C
C) chlorinated hydrocarbons.
D) Freon.
E) organic compounds.
Synchronous motors are used to
A) improve electrical system power factor.
bring up alternators to synchronous speed.
B) A
C) reduce the power factor for a power system.
D) eliminate the need for a DC power source.
E) drive a steam turbine.
A kilowatt-hour meter has a small motor which
A) turns at a constant speed.
B) slows down as power consumption increases.
, Power Engineering 4a - Unit 8 – Electrotechnology Test with Answers
C) has a speed proportional to power consumption.
D) moves the meter demand pointer.
C
E) indicates the multiplier to be used when reading the
meter.
The best type of diagram for showing electrical supply and
distribution systems is the
A) process diagram.
B) single line diagram (one line). B
C) elementary diagram.
D) piping diagram.
E) terminal and connection diagram.
In a 120/240 V one phase, three wire circuit, the color of
the circuit conductor that is grounded is
A) red.
B) white. B
C) black.
D) blue.
E) green.
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) 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.
, Power Engineering 4a - Unit 8 – Electrotechnology Test with Answers
The use of electronic switches can result in excessively
high transformer voltages due to a phenomena called
A) capacitive reactance.
B) inductive reactance. E
C) phase lag.
D) reactive voltage loss.
E) harmonic distortion.
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. D
B) 1636 V.
C) 1800 V.
D) 1980 V.
E) 2000 V.
A megohmmeter measures
A) amperage.
B) megawatts of power.
C
C) resistance.
D) voltage drop.
E) current flow.
The following materials have HIGH reluctance (select 3
correct answers):
A) iron
B) glass B, D, E
C) steel
D) air
E) oil
, Power Engineering 4a - Unit 8 – Electrotechnology Test with Answers
The connection provided on DC motors to supply the
armature with power
A) are slip rings.
B) are field poles. D
C) is a rheostat.
D) is a commutator.
E) is a rotating conductor.
The common solution for armature reaction on large DC
machines is
A) To install the interpoles
B) To install large field poles A
C) To install small field poles
D) To laminate the field poles
E) To shift the field poles
When a material or substance does not form a magnetic
flux easily it is said to have high
A) permeability.
B) resistance. C
C) reluctance.
D) field reactance.
E) magnetic flux density.
The brushes used to transfer power from armature are
made up of carbon because
A) It has high coeflcient of friction and is good conductor
of electricity
B) It has low coeflcient of friction and bad conductor of
C
electricity
C) It has low coeflcient 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
When using Fleming's Left Hand Rule, the index finger
represents
A) generator action flux direction.
B) motor action motion direction. D
C) generator conductor motion direction.
D) motor action flux direction.
E) motor action direction of current flow.
A basic law of electricity is, unlike charges attract each
other and like charges
A) impact each other.
B) hold each other. E
C) attract each other.
D) are neutralized.
E) repel each other.
Some of the hazards of electrical transformer cooling oil
can be compensated for by adding
A) chelates.
B) anti-foaming substances. C
C) chlorinated hydrocarbons.
D) Freon.
E) organic compounds.
Synchronous motors are used to
A) improve electrical system power factor.
bring up alternators to synchronous speed.
B) A
C) reduce the power factor for a power system.
D) eliminate the need for a DC power source.
E) drive a steam turbine.
A kilowatt-hour meter has a small motor which
A) turns at a constant speed.
B) slows down as power consumption increases.
, Power Engineering 4a - Unit 8 – Electrotechnology Test with Answers
C) has a speed proportional to power consumption.
D) moves the meter demand pointer.
C
E) indicates the multiplier to be used when reading the
meter.
The best type of diagram for showing electrical supply and
distribution systems is the
A) process diagram.
B) single line diagram (one line). B
C) elementary diagram.
D) piping diagram.
E) terminal and connection diagram.
In a 120/240 V one phase, three wire circuit, the color of
the circuit conductor that is grounded is
A) red.
B) white. B
C) black.
D) blue.
E) green.
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) 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.
, Power Engineering 4a - Unit 8 – Electrotechnology Test with Answers
The use of electronic switches can result in excessively
high transformer voltages due to a phenomena called
A) capacitive reactance.
B) inductive reactance. E
C) phase lag.
D) reactive voltage loss.
E) harmonic distortion.
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. D
B) 1636 V.
C) 1800 V.
D) 1980 V.
E) 2000 V.
A megohmmeter measures
A) amperage.
B) megawatts of power.
C
C) resistance.
D) voltage drop.
E) current flow.
The following materials have HIGH reluctance (select 3
correct answers):
A) iron
B) glass B, D, E
C) steel
D) air
E) oil
, Power Engineering 4a - Unit 8 – Electrotechnology Test with Answers
The connection provided on DC motors to supply the
armature with power
A) are slip rings.
B) are field poles. D
C) is a rheostat.
D) is a commutator.
E) is a rotating conductor.
The common solution for armature reaction on large DC
machines is
A) To install the interpoles
B) To install large field poles A
C) To install small field poles
D) To laminate the field poles
E) To shift the field poles
When a material or substance does not form a magnetic
flux easily it is said to have high
A) permeability.
B) resistance. C
C) reluctance.
D) field reactance.
E) magnetic flux density.
The brushes used to transfer power from armature are
made up of carbon because
A) It has high coeflcient of friction and is good conductor
of electricity
B) It has low coeflcient of friction and bad conductor of
C
electricity
C) It has low coeflcient 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
