1 |
The flow of D.C current is opposed by |
Resistor
Induction
Capacitor
All of these
|
2 |
Direct current can not flow through. |
Inductor
Resistor
Transistor
Capacitor
|
3 |
In case of A.C. through resistor V and I are |
At 0<sup> o</sup> with each other
At 180 <sup>o</sup> with each other
At 90<sup> o</sup> with each other
At 270 <sup>o</sup> with each other
|
4 |
Phase difference between V and I of an A.C through resistor is. |
Zero Degree
90 <sup>o</sup>
80<sup>o</sup>
120<sup>o</sup>
|
5 |
The Basic circuit element in a D.C. circuits which controls the current and voltage is |
<div>Resistor</div>
Inductor
<div>Capisitor</div>
Transistor
|
6 |
The basic circuit element in A.C. circuit which controls current. |
Resistor only
Capacitor only
Inductor only
All of these
|
7 |
An A.C. voltmeter reads 220 V, its peak value will be |
225 V
240 V
311.12 V
300 V
|
8 |
The sum of positive and negative peak value called. |
R.M.S. value
P-P value
Peak value
Average value
|
9 |
The peak value of A.C source is 20 A, then its rms value will be. |
14.1 A
10 A
20 A
28.2 A
|
10 |
The most common source of an A.C. Voltage is. |
Motor
Cell
Generator
Thermo couple
|
11 |
Average value of current and voltage over a complete cycle is. |
Positive
Negative
Zero
Infinite
|
12 |
In Pakistan the frequency of A.C. supply is. |
50 Hz
60 Hz
45 Hz
70 Hz
|
13 |
The wave form of alternating voltage is a |
Cotangent curve
Cosine curve
Sine curve
Tangent curve
|
14 |
The main use of A.C is |
Minimum line losses
Long distance transmission
Stepping up to required voltage only
Steeping down to required voltage only
|
15 |
The highest value reached by the voltage or current in one cycle is called. |
Peak ot peak value
Peak value
Instantaneous value
Root mean square value
|
16 |
The mean value of A.C. in a cycle is. |
1
0
I2
Nil
|
17 |
During each cycle A.C. voltage reaches a peak value. |
Once
Twice
Thrice
Four time
|