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31.

A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0Ω and armature current is 10 A. If the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be [2 marks]
(A) 1.79 Ω
(B) 2.1 Ω
(C) 3.1 Ω
(D) 18.9 Ω

asked in Electrical Engineering, 2011

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32.

A load center of 120 MW derives power from two stations connected by 220 kV transmission lines of 25 km and 75 km and 75 km as shown in the figure below. The three generators G1, G2 and G3 are of 100 MW capacity each and have identical fuel cost characteristics. The minimum loss generation schedule for supplying the 120 MW load is

[2 marks]
(A) P1 = 80 MW + losses
P2 = 20 MW
P3 = 20 MW
(B) P1 = 60 MW
P2 = 30 MW + losses
P3 = 30 MW
(C) P1 = 40 MW
P2 = 40 MW
P3 = 40 MW + losses
(D) P1 = 30 MW + losses
P2 = 45 MW
P3 = 45 MW

asked in Electrical Engineering, 2011

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33.

The open loop transfer function G(s) of a unity feedback control system is given as, G(s) = k(s + 2/3)/(s²(s+2))
From the root locus, it can be inferred that when k tends to positive infinity.
[2 marks]
(A) three roots with nearly equal real parts exist on the left half of the s-plane
(B) one real root is found on the right half of the s-plane
(C) the root loci cross the jω axis for a finite value of k; k ≠ 0
(D) three real roots are found on the right half of the s-plane

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

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34.

A portion of the main program to call a subroutine SUB in an 8085 environment is given below.
:
:
LXI D, DISP
LP: CALL SUB
:
:
It is desired that control be returned to LP + DISP + 3 when the RET instruction is executed in the subroutine. The set of instructions that precede the RET instruction in the subroutine are [2 marks]
(A) POP D
DAD H
PUSH D
(B) POP H
DAD D
INX H
INX H
INX H
PUSH H
(C) POP H
DAD D
PUSH H
(D) XTHL
INX D
INX D
INX D
XTHL

asked in Electrical Engineering, 2011

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35.

The transistor used in the circuit shown below has a β of 30 and I_CBO is negligible

If the forward voltage drop of diode is 0.7V, then the current through collector will be [2 marks]
(A) 168 mA
(B) 108 mA
(C) 20.54 mA
(D) 5.36 mA

asked in Electrical Engineering, 2011

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36.

A voltage commutated chopper circuit, operated at 500 Hz, is shown below.

If the maximum value of load current is 10 A, then the maximum current through the main (M) and auxiliary (A) thyristors will be [2 marks]
(A) i_{M max} = 12A and i_{A max} = 10A
(B) i_{M max} = 12A and i_{A max} = 2A
(C) i_{M max} = 10A and i_{A max} = 12A
(D) i_{M max} = 10A and i_{A max} = 8A

asked in Electrical Engineering, 2011

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