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19.

The response h(t) of a linear time invariant system to an impulse δ(t), under initially relaxed condition is h(t) =e^-t+ e^-2t . The response of this system for a unit step input u(t) is [2 marks]
(A) u(t) + e^-t + e^-2t
(B) (e^-t + e^-2t)u(t)
(C) (1.5-e^-t-0.5e^-2t)u(t)
(D) e^-tδ(t) + e^-2tu(t)

asked in Electrical Engineering, 2011

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20.

The direct axis and quadrature axis reactances of a salient pole alternator are 1.2 p.u and 1.0 p.u respectively. The armature resistance is negligible. If this alternator is delivering rated kVA at upf and at rated voltage then its power angle is [2 marks]
(A) 30°
(B) 45°
(C) 60°
(D) 90°

asked in Electrical Engineering, 2011

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21.

A 4½ digit DMM has the error specification as: 0.2% of reading + 10 counts. If a dc voltage of 100 V is read on its 200 V full scale, the maximum error that can be expected in the reading is [2 marks]
(A) ± 0.1%
(B) ± 0.2%
(C) ± 0.3%
(D) ± 0.4%

asked in Electrical Engineering, 2011

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22.

A three-bus network is shown in the figure below indicating the p.u. impedance of each element.

The bus admittance matrix, Y-bus, of the network is [2 marks]

asked in Electrical Engineering, 2011

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23.

A two-loop position control system is shown below.

The gain k of the Tacho-generator influences mainly the [2 marks]
(A) peak overshoot
(B) natural frequency of oscillation
(C) phase shift of the closed loop transfer function at very low frequencies (ω→0)
(D) phase shift of the closed loop transfer function at very high frequencies (ω→∞)

last reply by CpjJwWHV • 13 years ago • asked in Electrical Engineering, 2011

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24.

A two-bit counter circuit is shown below.

If the state Q_AQ_B of the counter at the clock time t_n is “10” then the state Q_AQ_B of the counter at t_n +3(after three clock cycles) will be [2 marks]
(A) 00
(B) 01
(C) 10
(D) 11

asked in Electrical Engineering, 2011

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