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73.
Statement for Linked Answer Questions:
The following Karnaugh map represents a function F.
[1] A minimized form of the function F is [2 marks]
(A) F = X Y + YZ
(B) F = X Y + YZ
(C) F = X Y + YZ
(D) F = X Y + Y Z[2] Which of the following circuits is a realization of the above function F?
[2 marks]
asked in Electrical Engineering, 2010
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74.
Given f(t) and g(t)as shown below:
[1] g(t) can be expressed as [2 marks]
(A) g(t) = f (2t − 3)
(B) g(t) = f (t/2 − 3)
(C) g(t) = f (2t − 3/2)
(D) g(t) = f (t/2 − 3/2)
[2] The Laplace transform of g(t) is [2 marks]
(A) (e3s - e5s)/s
(B) (e-5s - e-3s)/s
(C) (e-3s - e-5s)/s
(D) (e5s - e3s)/s
asked in Electrical Engineering, 2010
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75.
A separately excited DC motor runs at 1500 rpm under no-load with 200V applied to the armature. The field voltage is maintained at its rated value. The speed of the motor, when it delivers at torque of 5 Nm, is 1400 rpm as shown in the figure. The rotational losses and armature reaction are neglected.
[1] The armature resistance of the motor is. [2 marks]
(A) 2Ω
(B) 3.4Ω
(C) 4.4Ω
(D) 7.7Ω[2] For the motor to deliver a torque of 2.5Nm at 140 rpm, the armature voltage to be applied is [2 marks]
(A) 125.5V
(B) 193.3V
(C) 200V
(D) 241.7Vasked in Electrical Engineering, 2010
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76.
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