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TSGENCO Practice Quiz 6

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Question 1

The discrete time system described by y(n) = x(n²)is

Question 2

An impulse function consists of

Question 3

Fig. shows transistor tuned amplifier. The parallel resonant circuit has a capacitor of 250 pF in one branch and inductor of 1.25

H in the other branch. The inductor has a resistance of 10

The dynamic impedance of the tuned circuit at resonance in terms of Q of the circuit and resistance R of the inductor is

Question 4

If the voltage gain of an amplifier without feedback is 20 and with negative voltage feedback it is 12, then feedback fraction is…………………….

Question 5

An amplifier has a current gain of 200 and an output impedance of

without feedback. If negative current feedback

is applied, the output impedance of the amplifier will become

Question 6

What will be the power efficiency of a power amplifier having zero signal power dissipation of 5 watts and a.c. power output of 2 watts?

Question 7

A complementary – symmetry amplifier has…………………

Question 8

The mutual inductance between two coils each of N turns is M. If a current i in the first coil is brought to zero in a time t, then e.m.f. induced in the second coil is e.m.f. induced in the second coil is.

Question 9

Two coils X and Y are placed in a circuit such that a current changes by 2A in coil X and the magnetic flux change of 0.4 Wb occurs in coil Y. The mutual inductance between the coils is

Question 10

3-phase alternator supplies full-load at a lagging power factor of 0.6. The percentage increase in earning capacity when the power factor is raised to 0.9 becomes

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ESE & GATE EC General

Dec 1ESE & GATE EC