| 1 |
when an inductor comes close to a metallic object, its inductance is. |
- A. Decreased
- B. Increased
- C. Becomes half
- D. Becomes 4 times
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| 2 |
Impedance is denoted by: |
- A. A
- B. Z
- C. P
- D. Q
|
| 3 |
In AC system we generate sine wave form because: |
- A. It san be easily draw
- B. It produces least disturbance in electrical circuits
- C. It is nature standard
- D. Other waves cannot be produced easily
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| 4 |
In A.C circuit through a capacitor which one is: |
- A. Current leads voltage by 90<sup>∘</sup>
- B. Current lags behind voltage by 90<sup>∘</sup>
- C. Both will be in phase
- D. None of above
|
| 5 |
The basic circuit element in A.C. circuit which controls current. |
- A. Resistor only
- B. Capacitor only
- C. Inductor only
- D. All of these
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| 6 |
In Pakistan the frequency of A.C. supply is. |
- A. 50 Hz
- B. 60 Hz
- C. 45 Hz
- D. 70 Hz
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| 7 |
The phase angle of a series RLC circult at resonant frequency is |
- A. 1/2
- B. sigma
- C. Zero
- D. sigma /4
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| 8 |
Unit of impedance is: |
- A. Ohm
- B. Ohm<sup>-1</sup>
- C. no unit
- D. Ohm m<sup>-1</sup>
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| 9 |
The power factor of RL series circuit is. |
- A. 0
- B. 1
- C. Less then 1
- D. More than one
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| 10 |
100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is. |
- A. 30.8 Ohm
- B. 31.8 Ohm
- C. 34.8 Ohm
- D. 40 Ohm
|