Assuming that for a given potential to 1 / R
= = 1 +. 100
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.
21:- (b) the wattmeter read
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.