Analog Electronics - ECE Questions and Answers

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Which of the following is the fastest switching device?

JFET

BJT

MOSFET

Triode

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Which of the following is not valid in case of bipolars?

It has a low input impedance

It has high voltage gain

It is a current controlled device

It is difficult to bias

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The input resistance of JFET ideally approaches

zero

1 ohm

100 ohm

infinity

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In the analysis of common emitter amplifier we may neglect

h_re

h_oe

h_fe

h_ie

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The ac input voltage of an amplifier

is always equal to ac signal voltage

may be equal to or more than ac signal voltage

is always less than ac signal voltage

may be equal or more or less than ac signal voltage

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Assertion (A): Negative feedback reduces the gain of an amplifier

Reason (R): Negative feedback is very commonly used in amplifier circuits

Both A and R are correct and R is correct explanation for A

Both A and R are correct but R is not correct explanation for A

A is correct R is wrong

A is wrong R is correct

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In figure the coordinates of Q point on the load line are (Neglect V_BE)

I_C = 10 mA, V_CE = 15 V

I_C = 5 mA, V_CE = 22.5 V

I_C = 5 mA, V_CE = 15 V

I_C = 10 mA, V_CE = 22.5 V

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In the r_e model of a BJT amplifier, the ac resistance of diode at room temperature is about (I_E is quiescent emitter current)

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The emitter resistor R_E in the emitter of CE amplifier stabilizes the dc operating point against variation in

temperature only

β of transistor

both temperature and β

none of the above