Electronics Engineering Objective Questions { BJT Amplifiers and Oscillators }

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498. Low frequency response of a cascaded CE-amplifier consisting of two identical stages

A. is poorer than that of single stage

B. is better than that of single stage

C. is not affected from what it is for a single stage

D. none of these

499. High frequency response of an amplifier can be determined from

A. h-parameter model of the amplifier

B. hybrid-T model

C. hybrid-n model

D. none of these

500. Two CE amplifier stages have a lower 3 dB frequency of 30 Hz each. When cascaded together, the lower 3 dB frequency of overall amplifier is

A. apprximately 46 Hz

B. approximately 20 Hz

C. indeterminate from given data

D. none of these

501. a-cut off frequency is the one

A. where the gain is 3 dB less than the midband gain (in CB amplifiers only)

B. where CB amplifier's gain is zero

C. where CE amplifier's gain fall from midband given by 3 dB

D. none of these

502. n-cut off frequency is defined

A. with respect to CB configurations

B. as the frequency at which gain is 3 dB ' less than midband gain in CE amplifiers

C. as the frequency at which gain is 3 dB less than midband gain in CB amplifiers

D. as the frequency at which gain falls to zero

503. Gain bandwidth product of an amplifier

B. increases with increase in gain

C. increases with increase in bandwidth

D. none of these

504. High frequency response of an amplifier is very well expressed by one of the following expressions (n is no. of stages)

A. f2(n) = f2j(2)1111 ? 1

B. f2(n) ?11(2)" ? 1

D. none of these

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