GATE 2020 || Revision Test 9 for ESE & GATE EE Exams

Question 1

The common emitter forward current gain of the transistor shown is

.

The transistor is operating in

Question 2

A system with transfer function

is excited by sin (ωt). The steady-state output of the system is zero at

Question 3

If an energy meter disc makes 10 revolutions in 100 seconds when a load of 450 W is connected to it, the meter constant (in rev/kWh) is

Question 4

Fig. shows a thyristor with the standard terminations of anode A., cathode (K), gate (G) and the different junctions named J1, J2 and J3. When the thyristor is turned on and conducting

Question 5

A 800 kV transmission line is having per phase line inductance of 1.1 mH/km and per phase line capacitance of 11.68 nF/km. Ignoring the length of line, its ideal power transfer capability in MW is

Question 6

The parameters of a transposed overhead transmission line are given as:
Self reactance X_s = 0.5 p.u. and Mutual reactance X_m = 0.1 p.u. Calculate positive sequence reactance and zero sequence reactance respectively (in p.u.) are

Question 7

In the 4 × 1 multiplexer, the output F is given by F = A ⊕ B. Find the required input ‘I₃I₂I₁I₀’.

Question 8

A separately excited DC motor runs at 1000 rpm on no load when its armature terminals are connected to a 200V DC source and the rated voltage is applied to the field winding. The armature resistance of this motor is 1 Ω. The no-load armature current is negligible. With the motor developing its full load torque, the armature voltage is set so that the rotor speed is 500 rpm. When the load torque is reduced to 50% of the full load value under the same armature voltage conditions, the speed rises to 520 rpm. Neglecting the rotational losses, the full load armature current (in Ampere) is _______.

Question 9

If

Question 10

A resistive load is connected in series with a choke coil of internal resistance 5 Ω across a power supply of 400 V, 50 Hz. A current of 20 A is passing through load having a potential difference of 100 V across it. The value of inductance and power factor circuit are respectively.

Question 11

The A, B, C, D constants of a 220 kV line are: A = D= 0.94 ∠1 °, B = 130 ∠73 °, C = 0.001 ∠90 °. If the sending end voltage of the line for a given load delivered at nominal voltage is 240 kV, then % voltage regulation of the line is

Question 12

Consider a discrete time signal given by

The region of convergence of its Z-transform would be

Question 13

Let y[n] denote the convolution of h[n] and g[n], where h[n] = (1/2)ⁿ u[n] and g[n] is a casual sequence. If y[0] = 1 and y[1] = 1/2, then g[1] equals

Question 14

A DC motor has the following specifications: 10 hp, 37.5 A, 230 V; flux/pole = 0.01 Wb, number of poles = 4, number of conductors = 666, number of parallel paths = 2. Armature resistance = 0.267 Ω. The armature reaction is negligible and rotational losses are 600 W. The motor operates from a 230 V DC supply. If the motor runs at 1000 rpm, the output torque produced (in Nm) is ___________

Question 15

In a normal operation of 400 V, 50 Hz transformer, the total iron loss is 2500 W. when the supply voltage and frequency are reduce to 200 V and 25Hz respectively, the corresponding loss is 850W. The eddy-current loss at normal voltage