3A2 Chapters 7-10 Practice Questions with accurate
answers
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. Ans✓✓✓ 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 Ans✓✓✓ 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 battery in a circuit can force an electron to move, letting an electron
from an adjacent atom to ---------- in and take its place. Ans✓✓✓ rush
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.
e. Opens under abnormally high current conditions. Ans✓✓✓ e. Opens
under abnormally high current conditions.
,A coil has an inductance 20 mH. The inductive reactance is 100 Ω. Find
the line frequency. Ans✓✓✓ f = XL/(2πL)
where L = 20x10⁻³ H, XL = 100 Ω
f = 796 Hz
A coil with an inductance of 0.27 H is connected to a 110 V, 50 Hz
supply. Find the inductive reactance of the coil (in ohms) and the current
flowing through the coil (in amps). Ans✓✓✓ XL = 2πfL
and
I = E/XL
where L = 0.27 H, E = 110 V, f = 50 Hz
XL = 84.8 Ω, I = 1.30 A
A conductor's resistance to current flow is dependent on the following
factors:
a. Weight, type of material, length and temperature
, b. Weight, type of material, length, diameter and temperature
c. Weight, type of material, length and diameter
d. Weight, length, diameter and temperature
e. Type of material, length, diameter and temperature Ans✓✓✓ e. Type
of material, length, diameter and temperature
A dual supply system is one in which two independent power lines are
used to _____ the same load.
a. Balance.
b. Supply.
c. Make.
d. Distribute.
e. Carry. Ans✓✓✓ b. Supply.
A Kilowatt-hour meter can be described as:
a. A measurement of the reactive power being generated by the AC
generation system.
b. A meter that measures and records the amount of power produced by
the generator.
c. An indicator of the AC kilowatts that the generator is producing.
d. Giving an indication of the DC voltage that is being supplied to the
generators field windings.
answers
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. Ans✓✓✓ 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 Ans✓✓✓ 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 battery in a circuit can force an electron to move, letting an electron
from an adjacent atom to ---------- in and take its place. Ans✓✓✓ rush
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.
e. Opens under abnormally high current conditions. Ans✓✓✓ e. Opens
under abnormally high current conditions.
,A coil has an inductance 20 mH. The inductive reactance is 100 Ω. Find
the line frequency. Ans✓✓✓ f = XL/(2πL)
where L = 20x10⁻³ H, XL = 100 Ω
f = 796 Hz
A coil with an inductance of 0.27 H is connected to a 110 V, 50 Hz
supply. Find the inductive reactance of the coil (in ohms) and the current
flowing through the coil (in amps). Ans✓✓✓ XL = 2πfL
and
I = E/XL
where L = 0.27 H, E = 110 V, f = 50 Hz
XL = 84.8 Ω, I = 1.30 A
A conductor's resistance to current flow is dependent on the following
factors:
a. Weight, type of material, length and temperature
, b. Weight, type of material, length, diameter and temperature
c. Weight, type of material, length and diameter
d. Weight, length, diameter and temperature
e. Type of material, length, diameter and temperature Ans✓✓✓ e. Type
of material, length, diameter and temperature
A dual supply system is one in which two independent power lines are
used to _____ the same load.
a. Balance.
b. Supply.
c. Make.
d. Distribute.
e. Carry. Ans✓✓✓ b. Supply.
A Kilowatt-hour meter can be described as:
a. A measurement of the reactive power being generated by the AC
generation system.
b. A meter that measures and records the amount of power produced by
the generator.
c. An indicator of the AC kilowatts that the generator is producing.
d. Giving an indication of the DC voltage that is being supplied to the
generators field windings.
