Transformer coupling is used for ___________ amplification

The gain of an amplifier is expressed in db because ___________

A. It is a simple unit

B. Calculations become easy

C. Human ear response is logarithmic

D. None of the above

RC coupling is not used to amplify extremely low frequencies because

A. There is considerable power loss

B. There is hum in the output

C. Electrical size of coupling capacitor becomes very large

D. None of the above

A current amplification of 2000 is a gain of ___________

A. 3 db

B. 66 db

C. 20 db

D. 200 db

If the power level of an amplifier reduces to half, the db gain will fall by .

A. 5 db

B. 2 db

C. 10 db

D. 3 db