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124.
Statement for Linked Answer Questions :
[1] For the circuit given above, the Thevenin’s resistance across the terminals A and B is [2 marks]
(A) 0.5kΩ
(B) 0.2kΩ
(C) 1kΩ
(D) 0.11kΩ[2] For the circuit given above, the Thevenin’s voltage across the terminals A and B is [2 marks]
(A) 1.25V
(B) 0.25V
(C) 1V
(D) 0.5Vasked in Electrical Engineering, 2009
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125.
Statement for Linked Answer Questions :
The figure above shows coils 1 and 2, with dot markings as shown, having 4000 and 6000 turns respectively. Both the coils have a rated current of 25A. Coil 1 is excited with single phase, 400V, 50Hz supply.
[1] The coils are to be connected to obtain a single phase, 400/1000V, auto- transformer to drive a load of 10kVA. Which of the options given should be exercised to realize the required auto-transformer? [2 marks]
(A) Connect A and D; Common B
(B) Connect B and D; Common C
(C) Connect A and C; Common B
(D) Connect A and C; Common D[2] In the autotransformer obtained in above Question, the current in each coil is
[2 marks]
(A) Coil-1 is 25 A and Coil-2 is 10 A
(B) Coil-1 is 10 A and Coil-2 is 25 A
(C) Coil-1 is 10 A and Coil-2 is 15 A
(D) Coil-1 is 15 A and Coil-2 is 10 Aasked in Electrical Engineering, 2009
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126.
A system is described by the following state and output equations
dx1(t)/dt = -3x1(t) +x2(t) + 2u(t)
dx2(t)/dt = -2x2(t) + u(t)
y(t) = x1(t)
where u(t) is the input and y(t) is the output.
[1] The system transfer function is [2 marks]
(A) (s+2)/(s2+5s-6)
(A) (s+3)/(s2+5s+6)
(A) (2s+5)/(s2+5s+6)
(A) (2s-5)/(s2+5s-6)
[2] The state-transition matrix of the above system is [2 marks] 
asked in Electrical Engineering, 2009
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