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439.

Under no load condition, if the applied voltage to an induction motor is reduced from the rated voltage to half the rated value, [2 marks]
(a) the speed decreases and the stator current increases
(b) both the speed and the stator current decrease
(c) the speed and the stator current remain practically constant
(d) there is negligible change in the speed but the stator current decreases

asked in Electrical Engineering, 2005

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440.

In relation to the synchronous machines, which one of the following statements is false? [2 marks]
(a) In salient pole machines, the direct-axis synchronous reactance is greater than the quadrature-axis synchronous reactance
(b) The damper bars help the synchronous motor self-start
(c) Short circuit ratio is the ratio of the field current required to produce the rated voltage on open circuit to the rated armature current
(d) The V-curve of a synchronous motor represents the variation in the armature current with field excitation, at a given output power

asked in Electrical Engineering, 2005

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441.

In relation to DC machines, match the following and choose the correct combination.

Group –1
Performance Variables Group – 2
Proportional to

(P) Armature emf (E) (1) Flux (φ), speed (ω) and armature current (I_a)

(Q) Developed torque (T) (2) φ and ω only

(R) Developed power (P) (3) φ and I_a only

(4) I_a and ω only

(5) I_a only

[2 marks]
(A) P - 3, Q - 3, R - 1
(B) P - 2, Q - 5, R - 4
(C) P - 3, Q - 5, R - 4
(D) P - 2, Q - 3, R - 1

asked in Electrical Engineering, 2005

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