Analog Electronics - ECE Questions and Answers

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In an inverting amplifier using op-amp the current input to the inverting terminal

is equal to the current through feedback resistance

is less than the current through feedback resistance

is more than the current through feedback resistance

may be equal to, less or more than current through feedback resistance

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For a transistor the normal collector voltage is 12 V. If actually it is found to be + 28 V, the trouble could be

R_L is open

R_E is open

C_E is shorted

C_E is open

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In a CE transistor amplifier, when collector-emitter voltage increases

the instantaneous operating point moves up the load line

the instantaneous operating point moves down the line

load current increases

none of the above

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In figure, V_C is approximately equal to

2 V

4.6 V

8 V

7.6 V

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Which one of the following power amplifier has the maximum efficiency?

Class A

Class B

Class AB

Class C

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Figure shows small signal model of CB amplifier circuit. Then I and R are respectively equal to

a i_e and r_e

a i_e and r_e (a - 1)

(a - 1) i_e and r_e

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The common emitter short circuit current gain β of a transistor

is a monotonically increasing function of the collector current I_c

is a monotonically decreasing function of I_c

increasing with I_c, for low I_c, reaches a maximum and then decreases with further increase in I_c

is not a function of I_c

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A complementary symmetry amplifier has

1 P-N-P and 1 N-P-N transistor

2 P-N-P transistor

2 N-P-N transistor

2 P-channel FETs

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The units of are

V^-1

J/K