| 1 |
The AC system is preferred to DC system because: |
- A. AC voltage can be easily changed in magnitude
- B. DC motor angular velocity is affected badly
- C. High voltage AC transmission is less efficient
- D. Domestic appliance require AC voltage for their operation
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| 2 |
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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| 3 |
The mean value of A.C. in a cycle is. |
|
| 4 |
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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| 5 |
In frequency modulation, the amplitude of carrier waves is |
- A. Increases
- B. Remains constant
- C. Decreases
- D. None of these
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| 6 |
In the capacitive circuit of A.C. quantity when q= 0 the slope of q-t curve is. |
- A. Maximum
- B. Minimum
- C. Zero
- D. Negative
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| 7 |
In modulation, low frequency signal is known as |
- A. Carrier wave
- B. fluctuated signal
- C. Modulated carrier signal
- D. Modulation signal
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| 8 |
An alternating voltage is given by 20 sin 157 t. Th efrequency of alternating voltage is: |
- A. 50 Hz
- B. 25Hz
- C. 100 Hz
- D. 75 Hz
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| 9 |
The combined effect of resistance and reactance is knows as. |
- A. Inductance
- B. Conductance
- C. Resistance
- D. Impedance
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| 10 |
The flow of D.C current is opposed by |
- A. Resistor
- B. Induction
- C. Capacitor
- D. All of these
|