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559.

A dc potentiometer is designed to measure up to about 2V with a slide wire of 300 mm. A standard cell of emf 1.18 V obtains balance at 600 mm. A test cell is seen to obtain balance at 680 mm. The emf of the test cell is
[1 mark]
(a) 1.00 V
(b) 1.34 V
(c) 1.50 V
(d) 1.70 V

asked in Electrical Engineering, 2004

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560.

For a tachometer if θ(t) is the rotor displacement is radians, e(t) is the output voltage and K_t is the tachometer constant in V/rad/sec, then the transfer function, E(s)/Θ(s) will be [1 mark]
(a) K_ts²
(b) K_t/s
(c) K_t s
(d) K_t

asked in Electrical Engineering, 2004

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561.

Consider the function F(s) = 5/[s(s²+3s+2)], where F(s) is the Laplace transform of the function f(t). the initial value of f(t) is equal to
[1 mark]
(a) 5
(b) 5/2
(c) 5/3
(d) 0

asked in Electrical Engineering, 2004

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562.

The Nyquist plot of loop transfer function G(s) H(s) of a closed loop control system passes through the point (-1,j0) in the G(s) H(s) plane. The phase margin of the system is
[1 mark]
(a) 0°
(b) 45°
(c) 90°
(d) 180°

asked in Electrical Engineering, 2004

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563.

The voltage comparator shown in figure can be used in the analog-to-digital conversion as

[1 mark]
(a) a 1-bit quantizer
(b) a 2-bit quantizer
(c) a 4-bit quantizer
(d) a 8-bit quantizer

asked in Electrical Engineering, 2004

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564.

The digital circuit using two inverters shown in figure will act as

[1 mark]
(a) a bistable multi-vibrator
(b) an astable mutli-vibrator
(c) a monostable multi-vibrator
(d) an oscillator

asked in Electrical Engineering, 2004

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