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(d)

the junction near the anode is negatively biased and the one near the cathode is positevely biased.

Q.21:- In the two-wattneter nethod of neasurung power in a balanced threee-phase circuit, one wattmeter shows zero and thr other positve maximum. The lad powe factor is

(a) zero(b) 0.5(c) 0.866(d) 1.0

Q.22:- If the unit step response of a system is a unit impusle function, then the transfer function of such a system will be

(a) 1(b) 1/s(c) s(d) 1 / s²

Q.23:- The probability that a number selected at random between 100 and 999 (both inclusive will not contain the digit 7 is

(a) 16/25(b) (9/10)³(c) 27/75(d) 18/25

Q.24:- In the ciruit shown in the figure, N is a fintie gain amplifier with a gain of k, a very input impendance, and a very low output impedance. The input impendance of the feedback amplifier with the feedback Z connected, as shown will be

(a)

Z (1-1 / k)

(b)

Z (1-d)

(c)

Z (k-1)

(d)

Z (1-k)

Q.25:- A satellite carrying antenna system, transmitter, receiver and power supply is known as

(a)

geostationary satellite

(b)

orbital satellite

(c)

active satellite

(d)

passive satellite

Q.26:- In a virtual memory system, the address space specified by the address lines of the CCPU must than the secondary storage size.

(a)

smaller, smaller

(b)

smaller, larger

(c)

larger, smaller

(d)

larger, larger

Q.27:- Wires are made by

(a)

spinning

(b)

rolling

(c)

drawing

(d)

turning

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