WorksheetsAC FUNDAMENTALS
Total questions: 10
Worksheet time: 5mins
When an alternating current passes through an ohmic resistance the electrical power converted into heat is
Active Power
Reactive power
Apparent power
All of the Above
The r.m.s. value of a sine wave is 100 A. Its peak value is
70.7 A
150 A
141 A
282.8 A
A small capacitance is added to a highly inductive circuit then,
None
The power factor will increase
The power factor will decrease
The power will be unity
In a pure inductive circuit
The current is in phase with the voltage
The current can lead or a lag by 90 degree
The current leads the voltage by 90 degree
The current lags behind the voltage by 90 degree
In a pure resistive circuit
The current leads the voltage by 90 degree
The current can lead or a lag by 90 degree
The current is in phase with the voltage
The current lags behind the voltage by 90 degree
Form factor for a sine wave is
1.414
0.707
1.111
0.637
A sine wave has a frequency of 50 Hz. Its angular frequency is _______
220
314.15
440
1382.30
The peak value of a sine wave is 200 V. Its average value is
127.4 V
141.4 V
282.8 V
200.0 V
Calculate the crest factor if the peak value of current is 10A and the rms value is 2A.
12A
20A
0.2A
5A
The peak value of a sine wave is 230 V. Its r.m.s value is
162.6 V
141.4 V
127.4 V
200.0 V
