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11111 Pages: 4
circle does not matter
The derivative of 00), (d8(t)/dr) is
a) undefined 0) 0 £ 1 d) u(t)
The emitter bypass capacitor (capacitor across Re) is used in RC coupled amplifier to
a) Increase the O/P b) ൧൮10 voltage gain c) Forward bias the d) Reduce RC noise
impedance of the drop transistor in amplifier
transistor

Multi stage amplifiers are also called

a) Cascode amplifiers b) Darlington pair c) Cascade amplifiers 9 None of the above
If the feedback factor of an amplifier is 0.01, the gain with negative feedback is approximately

a) 100 (0) 1 c) 1000 (d) 500

Which of the following improvements is (are) a result of the negative feedback in a circuit?

a) Lower output (b) Reduced noise c) More linear (d) All of the above
impedance operation
Class D amplifiers differ from all other classes of amplifiers because

a) the outputtransistors 0) रग their very low c) ہ٤‎ their high- (d) they employ dual
are operated as input capacitance frequency response MOSFETs.
switches capabilities

The output impedance of a voltage regulator is

a) Very high (b) Equal to load voltage ௦) Very Small (d) Equal to input
divided by load voltage divided by
current output current

At channel pinch-off of MOSFET

a) The width of the (b) The width of the c) Width is 1/6 times (d) Width of induced
induced channel induced channel maximum possible channel is zero and
become non linear become very large width current saturates

A vector can be completely prescribed within a region by its

a) Curl & Gradient (0) Divergence& Curl c) Gradient, (d) Laplacian
Divergence &Curl

In metals which of the following equation will hold good?

a) ಲಗ) (0) Curl(J) = dD/dt ०) Curl(H)=D (൭) ९०16) = dB/dt

The Brewster angle is expressed as

a) tan! (n) (0) — tan”! (11/12) c) tan! (1211) (9) 0 (೧)

Which of the statements are true for Coaxial line

a) It supports TEM (b) Also supports other c) Power flow is (d) All of the above
waves higher modes like confined in the
TE.TM region between the
conductors

The characteristic impedance of a line having open and short impedances of 20 and 5 respectively is

a) 100 (b) 10 c) 20 ५१) 5

The dominant mode in waveguide is the mode which has

a) Highest frequency (0) Highest attenuation c) Lowest phase (५) Highest
constant wavelength

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