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655.

For the circuit of Fig. with an ideal operational amplifier, the maximum phase shift of the output V_out with reference to the input V_in is

[1 mark]
(a) 0°
(b) -90°
(c) +90°
(d) ±180°

asked in Electrical Engineering, 2003

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656.

In the circuit of Fig.Q17, assume that the transistor has h_FE=99 and V_BE = 0.7V.The value of collector current I_C of the transistor is approximately

[1 mark]
(a) [3.3/3.3] mA
(b) [3.3/(3.3+.33)] mA
(c) [3.3/33] mA
(d) [3.3/(33+3.3)] mA

asked in Electrical Engineering, 2003

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657.

The variation of drain current with gate-to-source voltage ( I_D - V_GScharacteristic) of a MOSFET is shown in Fig. The MOSFET is

[1 mark]
(a) an n-channel depletion mode device
(b) an n-channel enhancement mode device
(c) a p-channel depletion mode device
(d) a p-channel enhancement mode device

asked in Electrical Engineering, 2003

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658.

The interrupting time of a circuit breaker is the period between the instant of
[1 mark]
(a) initiation of short circuit and the arc extinction on an opening operation
(b) energizing of the trip circuit and the arc extinction on an opening operation
(c) initiation of short circuit and the parting of primary arc contacts
(d) energizing of the trip circuit and the parting of primary arc contacts

asked in Electrical Engineering, 2003

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659.

A round rotor generator with internal voltage E₁ = 2.0 p.u. and X = 1.1 p.u. is connected to a round rotor synchronous motor with internal voltage E₂ = 1.3 p.u. and X = 1.2 p.u. The reactance of the line connecting the generator to the motor is 0.5 p.u. when the generator supplies 0.5 p.u. power, the rotor angle difference between the machines will be [1 mark]
(a) 57.42°
(b) 1°
(c) 32.58°
(d) 122.58°

asked in Electrical Engineering, 2003

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660.

Choose two appropriate auxiliary components of a HVDC transmission system from the following
P. D.C. line inductor
Q. A.C. line inductor
R. Reactive power sources
S. Distance relays on D.C. line
T. Series capacitance of A.C. line
[1 mark]
(a) P and Q
(b) P and R
(c) Q and S
(d) S and T

asked in Electrical Engineering, 2003

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