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v22...

v22

A

only 'a' is correct

B

only 'b' is correct

C

only 'c' is correct

D

all the above are correct

Text Solution

Verified by Experts

The correct Answer is:
D
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Knowledge Check

  • A transformer steps down from 220V to 22V with secondary impedance of 220Omega . Current is drawn by a primary coil is

    A
    `10^(-6)A`
    B
    `10^(-4)A`
    C
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    D
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  • A transformer is used to reduce the main supply of 220V to 22V. If the currents in the primary and secondary are 2A and 15 A respectively, then the efficiency of the transformer is

    A
    0.65
    B
    0.75
    C
    0.8
    D
    0.9

  • If the forward bias voltage of a p-n junction diode is changed form 0.7 V to 2.2 V, the forward current changes by 1.5 mA , then the depletion layer is

    A
    `100 Omega`
    B
    `500 Omega`
    C
    `1000 Omega`
    D
    `5000 Omega`

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