23.

24.

25.

26.

27.

28.

29.

30.

31.

32.

33.

34.

39.

17192209

For an LTI system the Z transform is given as (where ೩೬0.5), H(z) =
02೭

a) Isalways stable 0) 15 always stable ௦)

and causal

Is always stable 0)
but not causal

6(t)*u(t) , where * denotes the convolution operation is

a) u(t) b) 60 c) x(t) d)

The ideal value for the stability factor is

a) 0 (b) More than 100 c) Infinite d)

−−−−−−−−− configuration is used as a buffer amplifier

a) Common base (b) Common c) Common (d)
Collector Emitter

A change in frequency by a factor of
a) 2 (b) 10

is equivalent to 1 octave.

c) 5 (d)
In order to start oscillations, a feedback oscillator requires
a) negative

feedback with

(0) positive feedback c) Gainequaltol. (6
with gain greater
gain less than 1. than 1.

The conversion efficiency of Class B Push pull amplifiers is approximately

a) 94.5% (b) 68.3% c) 48.5% (d)

What is the input resistance (Rin(source)) Of a common-gate amplifier?

a) Rs b) (1/gm)|[Rs ௦) 1/8 d)

Cascode amplifiers are

a) RC coupled (b) CB-CE c) CE-CB (d)
amplifiers configuration configuration

A capacitor stores 0.24 coulombs at 10 volts. Its capacitance is

a) 0.024F (0) 0.24F c) 2.4F (d)

Pages:5

Cannot be
predicted

None of the

above

20

no feedback.

78.5%

None of the
above

CE-CC
configuration

240nF

What is the major factor for determining whether a medium is free space, a lossless dielectric,

lossy dielectric or good conductor?

a) Attenuation (b) Phase factor c) Reflection (d)

constant Coefficient

The power in an electromagnetic wave with electric field and magnetic field intensities 12 and 8

respectively is

a) 96 (b) 9.6 c) 24 (d)
Find the reflection coefficient of the wave with SWR of 3.5.

a) 0.55 (b) 5.5 c) 0.23 d)

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Loss tangent

48

1.5