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Question 1 of 17
1. Question
Two independent random variables X and Y are uniformly distributed in the interval [–1,1]. The probability that max[X, Y] is less than 1/2 is
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Question 2 of 17
2. Question
A system with transfer function
G(s) = [(s*s +9)(s+2)] / [(s+1)(s+3)(s+4)]
is excited by sin(wt).The steady state output of the system is zero at
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Question 3 of 17
3. Question
The slip of an induction motor normally does not depend on
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Question 4 of 17
4. Question
The bridge method commonly used for finding mutual inductance is
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Question 5 of 17
5. Question
With initial condition x(1) = 0.5 , the solution of the differential equation t(dx/dt) + x = t is
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Question 6 of 17
6. Question
The average power delivered to an impedance (4j3) ohm by a current 5cos(100*pi*t + 100) A is
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Question 7 of 17
7. Question
The output Y of a 2bit comparator is logic 1 whenever the 2bit input A is greater than the 2bit input B. The number of combinations for which the output is logic 1, is
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Question 8 of 17
8. Question
The sequence components of the fault current are as follows:Ipositive = j1.5 pu, Inegative = –j0.5 pu, Izero = –j1 pu. The type of fault in the system is
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Question 9 of 17
9. Question
A halfcontrolled singlephase bridge rectifier is supplying an RL load. It is operated at a firing angle A and the load current is continuous. The fraction of cycle that the freewheeling diode conducts is (where PI is 3.14 constant)
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Question 10 of 17
10. Question
The typical ratio of latching current to holding current in a 20 A thyristor is
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Question 11 of 17
11. Question
The maximum value of f(x) = x39×2+24x+5 in the interval [1, 6] is (where number after x denote power like x3 is x cube)
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Question 12 of 17
12. Question
Let y[n] denote the convolution of h[n] and g[n], where h[n] = [(1/2) to the power n] u[n] and g[n] is a causal sequence. If y[0] = 1 and y[1] = 1/2, then g[1] equals
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Question 13 of 17
13. Question
A cylindrical rotor generator delivers 0.5 pu power in the steadystate to an infinite bus through a transmission line of reactance 0.5 pu. The generator noload voltage is 1.5 pu and the infinite bus voltage is 1 pu. The inertia constant of the generator is 5 MWs/MVA and the generator reactance is 1 pu. The critical clearing angle, in degrees, for a threephase dead short circuit fault at the generator terminal is
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Question 14 of 17
14. Question
A 220 V, 15 kW, 1000 rpm shunt motor with armature resistance of 0.25 ohm has a rated line current of 68 A and a rated field current of 2.2 A. The change in field flux required to obtain a speed of 1600 rpm while drawing a line current of 52.8 A and a field current of 1.8 A is
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Question 15 of 17
15. Question
A fair coin is tossed till a head appears for the first time. The probability that the number of required tosses is odd, is
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Question 16 of 17
16. Question
The Fourier transform of a signal h(t) is H( jw) = (2cosw)(sin2w) /w . The value of h(0) is
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Question 17 of 17
17. Question
An analog voltmeter uses external multiplier settings. With a multiplier setting of 20 kohm it reads 440 V and with a multiplier setting of 80 kohm it reads 352 V. For a multiplier setting of 40 kohm the voltmeter reads
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