Power Engineering - 4th and 3rd Class Electricity Practice
Questions With Complete Solutions
__________ current flow is from positive to negative.
a. Electron
b. Static
c. Conventional
d. Generated
e. Reversed Correct Answers c. Conventional
__________ is an electromotive force.
a. Power
b. Amperage
c. The ohm
d. The watt
e. The volt Correct Answers e. The volt
__________________ are used on DC motors and generators to
set up a magnetic field.
a. Transformers
b. Field poles
c. Insulated wires
d. Mica strips
e. Carbon rings Correct Answers b. Field poles
4.16 kV emergency switching could be described as:
,a. In the event that the incoming 600 V power should be lost,
critical users are supplied with 480 V emergency power from the
900 kW natural gas turbine generator.
b. In the event that the incoming 4.16 kV power should be lost,
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
c. In the event that the incoming 600 V power should be lost,
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
d. In the event that the incoming 4.16 kV power should be lost,
critical users are supplied with 480 V emergency power from the
900 kW natural gas turbine generator.
e. In the event that the incoming utility power should be lost,
critical users are supplied with 480 V emergency power from the
250 kW diesel generator. Correct Answers b. In the event that
the incoming 4.16 kV power should be lost, critical users are
supplied with 4.16 kV emergency power from the 900 kW
natural gas turbine generator.
480 V emergency switching could be described as:
a. In the event that the incoming 600 V power should be lost
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
b. In the event that the incoming 600 V power should be lost
critical users are supplied with 600 V emergency power from the
900 kW natural gas turbine generator.
c. In the event that the incoming utility power should be lost,
critical users are supplied with 480 V emergency power from the
250 kW diesel generator.
,d. In the event that the incoming 4.16 kV power should be lost
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
e. In the event that the incoming utility power should be lost,
critical users are supplied with 4.16 kV emergency power from
the 250 kW diesel generator. The second automatic transfer
switch, will switch over to this generator Correct Answers c. In
the event that the incoming utility power should be lost, critical
users are supplied with 480 V emergency power from the 250
kW diesel generator.
A 120/208 volt system is best described as a:
a. Two phase wye connected two-wire system
b. Three phase three-wire system
c. Two phase delta connected two-wire system
d. Three phase wye connected four-wire system
e. Two phase delta connected three-wire system Correct
Answers d. Three phase wye connected four-wire system
A 120V/240V single phase system:
a. Is not used for heating elements
b. Can power a 3 phase motor
c. Has 2 wires energized from the source and a white or
grounded wire
d. Is not used in Canada
e. Has 3 wires energized from the source and a white or
grounded wire Correct Answers c. Has 2 wires energized from
the source and a white or grounded wire
, A 4 pole alternator producing 60 Hz power must turn at:
a. 1200 rpm
b. 2400 rpm
c. 1800 rpm
d. 600 rpm
e. 1000 rpm Correct Answers c. 1800 rpm
A basic law of electricity is, unlike charges attract each other
and like charges:
a. repel each other
b. attract each other
c. reduce power output
d. hold each other
e. are neutralized Correct Answers a. repel each other
A battery in a circuit can force an electron to move, letting an
electron from an adjacent atom to ---------- in and take its place.
Correct Answers rush
A bearing starting to seize will increase the ---------- on a motor
resulting in increased current flow. Correct Answers load
A circuit breaker is an automatic device that:
a. Provides a circuit junction box.
b. Indicates line amperage.
c. Is used to switch power on and off.
d. Indicates line voltage.
Questions With Complete Solutions
__________ current flow is from positive to negative.
a. Electron
b. Static
c. Conventional
d. Generated
e. Reversed Correct Answers c. Conventional
__________ is an electromotive force.
a. Power
b. Amperage
c. The ohm
d. The watt
e. The volt Correct Answers e. The volt
__________________ are used on DC motors and generators to
set up a magnetic field.
a. Transformers
b. Field poles
c. Insulated wires
d. Mica strips
e. Carbon rings Correct Answers b. Field poles
4.16 kV emergency switching could be described as:
,a. In the event that the incoming 600 V power should be lost,
critical users are supplied with 480 V emergency power from the
900 kW natural gas turbine generator.
b. In the event that the incoming 4.16 kV power should be lost,
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
c. In the event that the incoming 600 V power should be lost,
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
d. In the event that the incoming 4.16 kV power should be lost,
critical users are supplied with 480 V emergency power from the
900 kW natural gas turbine generator.
e. In the event that the incoming utility power should be lost,
critical users are supplied with 480 V emergency power from the
250 kW diesel generator. Correct Answers b. In the event that
the incoming 4.16 kV power should be lost, critical users are
supplied with 4.16 kV emergency power from the 900 kW
natural gas turbine generator.
480 V emergency switching could be described as:
a. In the event that the incoming 600 V power should be lost
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
b. In the event that the incoming 600 V power should be lost
critical users are supplied with 600 V emergency power from the
900 kW natural gas turbine generator.
c. In the event that the incoming utility power should be lost,
critical users are supplied with 480 V emergency power from the
250 kW diesel generator.
,d. In the event that the incoming 4.16 kV power should be lost
critical users are supplied with 4.16 kV emergency power from
the 900 kW natural gas turbine generator.
e. In the event that the incoming utility power should be lost,
critical users are supplied with 4.16 kV emergency power from
the 250 kW diesel generator. The second automatic transfer
switch, will switch over to this generator Correct Answers c. In
the event that the incoming utility power should be lost, critical
users are supplied with 480 V emergency power from the 250
kW diesel generator.
A 120/208 volt system is best described as a:
a. Two phase wye connected two-wire system
b. Three phase three-wire system
c. Two phase delta connected two-wire system
d. Three phase wye connected four-wire system
e. Two phase delta connected three-wire system Correct
Answers d. Three phase wye connected four-wire system
A 120V/240V single phase system:
a. Is not used for heating elements
b. Can power a 3 phase motor
c. Has 2 wires energized from the source and a white or
grounded wire
d. Is not used in Canada
e. Has 3 wires energized from the source and a white or
grounded wire Correct Answers c. Has 2 wires energized from
the source and a white or grounded wire
, A 4 pole alternator producing 60 Hz power must turn at:
a. 1200 rpm
b. 2400 rpm
c. 1800 rpm
d. 600 rpm
e. 1000 rpm Correct Answers c. 1800 rpm
A basic law of electricity is, unlike charges attract each other
and like charges:
a. repel each other
b. attract each other
c. reduce power output
d. hold each other
e. are neutralized Correct Answers a. repel each other
A battery in a circuit can force an electron to move, letting an
electron from an adjacent atom to ---------- in and take its place.
Correct Answers rush
A bearing starting to seize will increase the ---------- on a motor
resulting in increased current flow. Correct Answers load
A circuit breaker is an automatic device that:
a. Provides a circuit junction box.
b. Indicates line amperage.
c. Is used to switch power on and off.
d. Indicates line voltage.
