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Electronics & Communication Engineering - Electronics Devices and Circuits

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19.

Which of the following define(s) the conversion efficiency?

A.	Dc output power/ac input power	B.	Ac power to the load/ac input power
C.	Ac power to the load/dc power supplied	D.	All of the above

20.

Which of the following should be done to obtain the ac equivalent of a network?

A.	Remove all elements bypassed by the short-circuit equivalent	B.	Replace all capacitors by a short-circuit equivalent
C.	Set all dc sources to zero	D.	All of the above

21.

For the collector dc feedback configuration, there is a ________ phase shift between the input and output signals.

A.	0°	B.	45°
C.	90°	D.	180°

22.

For BJT amplifiers, the ________ gain typically ranges from a level just less than 1 to a level that may exceed 1000.

A.	impedance	B.	current
C.	voltage	D.	All of the above

23.

Which of the following techniques can be used in the sinusoidal ac analysis of transistor networks?

A.	Large-signal	B.	Small-signal
C.	Small- or large-signal	D.	None of the above

24.

The input impedance of a BJT amplifier is purely ________ in nature and can vary from a few ________ to ________.

A.	capacitive, microfarads, farads	B.	inductive, millihenrys, henrys
C.	resistive, ohms, megohms	D.	None of the above

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