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Electronics & Communication Engineering - Electronics Devices and Circuits

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49.

The dc emitter current of a transistor is 8 mA. What is the value of re?

A.	320 Ω	B.	13.3 kΩ
C.	3.125Ω	D.	5.75Ω

50.

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

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

51.

In an unbypassed emitter bias configuration hiereplaces ________ in the remodel

A.	re	B.	β
C.	βre	D.	Ib

52.

Which of the following is (are) true regarding the input impedance for frequencies in the midrange100 kHz of a BJT transistor amplifier?

A.	The input impedance is purely resistive	B.	It varies from a few ohms to megohms
C.	An ohmmeter cannot be used to measure the small-signal ac input impedance	D.	All of the above

53.

Which of the following configurations has an output impedance Zoequal to RC?

A.	Fixed-bias common-emitter	B.	Common-emitter voltage-divider with bypass capacitor
C.	Common-emitter voltage-divider without bypass capacitor	D.	All of the above

54.

For a common-emitter amplifier, the purpose of the emitter bypass capacitor is

A.	no purpose, since it is shorted out by RE	B.	to reduce noise
C.	to despike the supply voltage	D.	to maximize amplifier gain

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