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# ELECTRICAL ENGINEERING - page 11 / 15

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Assuming that for a given potential to 1 / R

We have

=      = 1 +. 100

0.7 amps,

The current I, at 1200°C is given by

=      = 1 +. 1200

=   1 + 0.0043 x 1200 = 6.16

I = 1 / 6.16 = 0.16 amp.

19:- (c) A standard relation    VO =

20:- (c) When a thyristor is negatively biased, outer junctions are negatively biased and the inner junction is      positively biased.

One

Then other

Thus whenever load p.f. angle ϕ becomes 60° one of the watt meters would read zero.

For the given condition the load p.f. is

Cos 60° = 0.5

22:- (c) Input r (t) = u (t)     R (s) = 1 / s

Out put c (t) =  (t)   C (s) = 1

Transfer function =    =       s.

23:- (d) Probability that the unit digit is not 7 is 9 / 10. Probability that the tens digit is not 7 is 9 / 10. Probability that the hundreds digit is not 7 is 8 / 9. So, probability that the unit digit is not 7 and the tens digit in not 7 and the hundreds digit is not 7 is:

(9 / 10) (9 /10)(8 /9) = 18 /25.

24:- (d) From Miller’s theorem = Z / 1 – K.

25:- (c) The active satellite carries antenna system transmitter receiver and power supply. It works as an active micro-wave repeaters, relay and signal to the receiving station either instantly or after storage in its memory and waiting until the satellite faces the earth based receiving station.

26:- (c) Larger, smaller.

27:- (c) Wire-drawing process is used for making wires of various diameters.

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