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GATE EE: 2018 Mini Mock 7

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Question 1

If the value of junction capacitance of a SCR is 20pF and it is independent of the off-state voltage and also, the gate-trigger current is 20mA. Now, if a capacitor of 15nF is connected across the SCR, then determine the critical value of dv/dt.

Question 2

Why a power semiconductor diode do gets destroyed when it carries the same rated current in reverse direction as it carries in forward direction from anode to cathode?

Question 3

In Fourier transform of CT aperiodic signals uncountable number of harmonics is represented as?

Question 4

Compute the system’s response to the input x[n] =

| if the unit impulse response h[n] of a DT LTI system is h[n]= δ[n-1]?

Question 5

Given below is an asymptotic bode plot representing an open-loop transfer function.

How many non-zero poles does the transfer function contain?

Question 6

Find the value of C2 to design a second order multiple feedback low pass filter with a cut off frequency of 10 KHz and voltage gain of 20 dB, Quality factor =1 and given that R1= R2 = 1kΩ?

Question 7

A current filament carries a current of 10 A in the

direction on z axis. Find the magnetic field intensity

at a point P(1, 2 , 3) due to this filament , if it extends from z= -

Question 8

A 50 KVA, 1000/330 V transformer is undergone the short circuit test on the hv side. The meter readings obtained were:
Wattmeter reading = 900 W
Ammeter reading = 25 A
Voltmeter reading = 85 V
Determine the equivalent reactance referred to the primary.

Question 9

A shunt generator has an induced emf of 284 V. When the generator is loaded, the terminal voltage is 210 V. Neglecting armature reaction, find the load current if the armature resistance is 0.08 ohm and the field circuit resistance is 32 ohms.

Question 10

A cylinder rotor generator delivers 0.75pu power in the steady-state to an infinite bus through a transmission line of reactance 0.4pu. The generator no-load voltage is 1.5pu and the infinite bus voltage is 1.2pu. The inertia constant of the generator is 5MJ/MVA and the generator reactance is 0.75pu. Find the critical clearing angle (in degrees) for a three phase short circuit fault at the generator terminal.

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ESE & GATE EE General

Jun 21ESE & GATE EE