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WorksheetsQuiz 2 ESE DC and AC System
Total questions: 10
Worksheet time: 6mins
Name
Class
Date
1.
What is the rms value of 20A peak current of an electrical device?
a)
34.64 A.
b)
17.32 A.
c)
14.14 A.
d)
12.74 A.
2.
In an electrical drawing, the following items can be found EXCEPT
a)
total cost.
b)
title block.
c)
legend.
d)
suffix.
3.
Resonance happens when Capacitor and Inductor are ………
a)
connected in parallel and have equal reactances
b)
connected in series and have equal reactances.
c)
connected in series and have equal resistances.
d)
connected in parallel and have equal resistances.
4.
A 5.0 H choke coil with negligible resistance is connected to a 240V, 50Hz supply. What will be the value of the inductive reactance of the coil?
a)
17.6 mW.
b)
6.37 mW.
c)
0.76 mW
d)
0.64 mW.
5.
The ratio between KW and KVA in an AC circuit represents the circuit
a)
Efficiency
b)
Power Factor.
c)
Phase Angle.
d)
Power Triangle.
6.
When a pure resistor is connected across an AC supply, the phase shift between Voltage,V and Current,I is …….
a)
180 degree.
b)
90 degree.
c)
45 degree.
d)
0 degree.
7.
The power factor improvement method recommended for a larger system which having too many low rating motors is
a)
unit.
b)
centralized.
c)
small.
d)
major.
8.
A load is supplied with 60V,50 Hz AC supply. An ammeter series with the load shows 0.5 A. A Wattmeter connected to the system show 15W. What is the power factor?
a)
0.25
b)
0.5
c)
0.75
d)
1
9.
For power factor correction panel, the ON-OFF switching of the capacitor bank is done automatically by using.
a)
In-rush reactor.
b)
power factor regulator.
c)
circuit breaker
d)
magnetic contactor
10.
Determine the Power Factor of 20 KW, 3 phase, D-connected load if it draws a line current of 30 A when connected across 415 V, 50 Hz supply
a)
0.93
b)
0.66
c)
0.54
d)
0.31
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