| 1 |
In modulation, low frequency signal is known as |
- A. Carrier wave
- B. fluctuated signal
- C. Modulated carrier signal
- D. Modulation signal
|
| 2 |
In a pure inductive A.C. circuit the current. |
- A. Lags behind voltage by 90 <sup>o</sup>
- B. Leads the voltage by 90 <sup>o</sup>
- C. In phase with voltage
- D. Leads the voltage by 270 <sup>o</sup>
|
| 3 |
The reactance of inductor depends upon |
- A. L
- B.
- C.
- D. All of the above
|
| 4 |
During each cycle A.C. voltage reaches a peak value. |
- A. Once
- B. Twice
- C. Thrice
- D. Four time
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| 5 |
The combined effect of resistance and reactance in circuit is called: |
- A. Impedance
- B. Inductance
- C. Capacitance
- D. None of above
|
| 6 |
The peak value of alternating current is 5<b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√2 </b><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">A. The mean square value of current will be:</span> |
- A. 5A
- B. 2.5A
- C. 5<b style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">√2A</b>
- D. 5<sup>2</sup>
|
| 7 |
An A.C. voltmeter reads 220 V, its peak value will be |
- A. 225 V
- B. 240 V
- C. 311.12 V
- D. 300 V
|
| 8 |
The reactance is the ratio of |
- A. V<sub>rms</sub>/I<sub>rms</sub>
- B. V<sub>rms</sub> x I<sub>rms</sub>
- C. I<sub>rms</sub>/V<sub>rms</sub>
- D. V<sub>max</sub> x V<sub>rms</sub>
|
| 9 |
Radio frequency choke is |
- A. Iron cored
- B. Air Cored
- C. Air as well as iron cored
- D. None of these
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| 10 |
The main use of A.C is |
- A. Minimum line losses
- B. Long distance transmission
- C. Stepping up to required voltage only
- D. Steeping down to required voltage only
|