GATE EEE Model Question paper

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An SCR is considered to be a semi-controlled device because

(A) it can be turned OFF but not ON with a gate pulse
(B) it conducts only during one half-cycle of an alternating current wave
(C) it can he turned ON but not OFF with a gate pulse
(D) it can be turned ON only during one half-cycle of an alternating voltage wave

The two inputs of a CRO are fed with two stationary periodic signals. In the X-Y mode, the screen shows a figure which changes from ellipse to circle and back to ellipse with its major axis changing orientation slowly and repeatedly. The following inference can be made from this.

(A) The signals are not sinusoidal
(B) The amplitudes of the signals arc very close but not equal
(C) The signals are sinusoidal with their frequencies very close but not equal
(D) There is a constant but small phase difference between the signals

The increasing order of speed of data access for the following devices is
(i) Cache Memory (ii) CDROM (iii) Dynamic RAM
(iv) Processor Registers (v) Magnetic Tape

(A) (v), (ii), (iii), (iv), (i)
(B) (v), (ii), (iii), (i), (iv)
(C) (ii), (i), (iii), (iv), (v)
(D) (v), (ii), (1), (iii) , (iv)

A field excitation of 20 A in a certain alternator results in an armature current of 400 A in short circuit and a terminal voltage of 2000 V on open circuit. The magnitude of the internal voltage drop within the machine at a load current of 200 A is
(A)1V (B)10V (C) 100V (D) 1000V

The pressure coil of a dynamometer type wattmeter is
(A) highly inductive (B) highly resistive (C) purely resistive (B) purely inductive

Out of the following plain categories
(i) Nuclear (ii) Run-of-river (iii) Pump Storage (iv) Diesel
the base load power plants are
(A) (i) and (ii) (B) (ii) and (iii) (C) (i). (ii) and (iv) (D) (i), (in) and (Iv)
GATE EEE Model paper



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