| 1 |
Electro magnetic waves emitted from radio antenna are. |
- A. Stationary
- B. Longitudinal
- C. Transvers
- D. Both a and b
|
| 2 |
The reactance of inductor depends upon |
- A. L
- B.
- C.
- D. All of the above
|
| 3 |
The mean value of A.C. in a cycle is. |
|
| 4 |
The main reason for world wide use of A.C is because: |
- A. It is very high power
- B. It can be transmitted over long distance
- C. It is cheaper to use
- D. ALl of above
|
| 5 |
when an inductor comes close to a metallic object, its inductance is. |
- A. Decreased
- B. Increased
- C. Becomes half
- D. Becomes 4 times
|
| 6 |
The device which allows only the flow of D.C. is. |
- A. Capacitors
- B. transformer
- C. Inductor
- D. Generator
|
| 7 |
The A.M. transmission frequencies range from |
- A. 540 KHz to 1000 KHz
- B. 540 Khz to 1600 KHz
- C. 520 KHz TO 1600 KHz
- D. 520 KHz TO 1400 KHz
|
| 8 |
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
|
| 9 |
An electromagnetic wave goes from air to glass which of the following does not change? |
- A. Radio waves
- B. X-rays
- C. Ultra violet radiation
- D. Ultra sond waves
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| 10 |
The phase difference between the current and voltage at resonce is: |
- A. 0
- B. <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">π</span>
- C. -<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">π</span>
- D. <span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 16px;">π/2</span>
|