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LMRC JE 2018 EE: Practice Quiz 22

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Question 1

The series ohmmeter shown in Fig. is made up of a 3 V battery, a 100μA meter and a resistance r which has a fixed value of 30-kΩ What is the value of unknown resistance R, when the pointer indicates half full-scale deflection?

Question 2

If the forward voltage in a semiconductor diode changes from 0.7 V to 0.8 V, then forward current changes from 10 mA to 20 mA. The forward a.c. resistance of the diode is

Question 3

The armature of a d.c. machine having 10 poles is rotating at a speed of 10 revolutions per second. The number of hysteresis loops formed per second is……………….

Question 4

At Resonant frequency, the impedance of a parallel resonant circuit is Z_r. The circuit impedance of half-power frequencies is

Question 5

A lighting stroke discharges impulse current of 10 kA (peak) on a 400 kV transmission line having surge impedance of 250 Ω. The magnitude of transient over-voltage traveling waves in either direction assuming equal distribution form the point of lighting strike will be

Question 6

When the pointer of an indicating instrument is in the final deflected position ……………………

Question 7

If the circuit shown in figure is connected to 120 V d.c., the current drawn by the circuit is …………….
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Question 8

The nature of armature winding of a d.c. machine is decided by……………….

Question 9

A coil of resistance 5-Ω and inductance 8-mH is shunted by a capacitor of 2-nF. The bandwidth of the resonant circuit of the supply frequency to the circuit is 50 Hz?

Question 10

A 12-pole, 3-phase, star-connected induction motor runs at

It has a rotor resistance of

and stand-still reactance of

. The slip corresponding to maximum torque under running conditions is

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ESE & GATE EE General

Nov 24ESE & GATE EE