49,

50.

81.

52.

53.

54.

55.

56.

A differential amplifier inputs are 5 mV and 3 mV. The output is 300 mV. What is the
amplifier gain :

ക? : (0) 67
(©) 150 . യ) 300

If the bandwidth of an oscilloscope is 12 MHz, what is the fastest rise time a sine wave can
have in order to be accurately reproduced by the instrument?

(ക 42 ००७९८ (B) 19 msec
(C) 49 ೫೦೦೦ (D) 29 msec

2 identical coils of 200 turns each, lie in a parallel plane and produced a flux of 400 mWb. If a
current of 8 A flows through one coil, find the mutual inductance 7

മു 1011 ® 21
© 8H (0) 61

A coil of insulated wire of resistance 8 ohm and inductance 0.03 H are connected across 240 V
50 Hz supply. Caleulate the active power drawn by the coil :

ക ۷ (B) 3.01kW
ര ‏۳٣+‎ ©( 1.03 ۳۲

Peak factor of a sinusoidal wave is :

(മു 111 യ 1415
(0) 0.707 - (0) 0.637
The magnetic hysteresis is primarily due to :
(ಹಿ) permeability (B) flux density
(0) retentivity (D) த

Load in each branch of a delta connected balanced 3 phase, 400 V, 50 Hz circuit consists of an
inductance of 31.8 mH series with a resistance of 10 ohm. Calculate total power consumed by
the ckt :

(^) 481% ற 81
¢) 24.01 kW (2) 08

A 20 kV is applied across a capacitor with capacitance is 0.0004 micro farad. The capacitor is
formed by 2 parallel metal plates each of area 200 cm? and separated by a dielectric 4 mm
thick. Find the electric flux density :

(ಯ) ഭായ്‌ (8) 2×10 C/m?
ര 6:10 6 (D) 8x107 C/m?

226/2018 یں
‎[P.T.0.]‏