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541.

A 50 kVA, 3300/230V single-phase transformers is connected as an autotransformer shown in figure. The nominal rating of the autotransformer will be

[2 marks]
(a) 50.0 kVA
(b) 53.5 kVA
(c) 717.4 kVA
(d) 767.4 kVA

asked in Electrical Engineering, 2004

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542.

The armature resistance of a permanent magnet dc motor is 0.8Ω. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A form the same source will be [2 marks]
(a) 48.0%
(b) 57.1%
(c) 59.2%
(d) 88.8%

asked in Electrical Engineering, 2004

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543.

A rotating electrical machine having its self-inductances of both the stator and the rotor windings, independent of the rotor position will be definitely not develop [2 marks]
(a) starting torque
(b) synchronizing torque
(c) hysteresis torque
(d) reluctance torque

asked in Electrical Engineering, 2004

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544.

The synchronous speed for the seventh space harmonic mmf wave of a 3-phase, 8 pole, 50 Hz induction machine is [2 marks]
(a) 107.14 rpm in forward direction
(b) 107.14 rpm in reverse direction
(c) 5250 rpm in forward direction
(d) 5250 rpm in reverse direction

asked in Electrical Engineering, 2004

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545.

The Z matrix of a 2-port network as given by . The element Y₂₂ of the corresponding Y matrix of the same network is given by
[2 marks]
(a) 1.2
(b) 0.4
(c) -0.4
(d) 1.8

asked in Electrical Engineering, 2004

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546.

The rms value of the resultant current in a wire which carries a dc current of 10 A and a sinusoidal alternating current of peak value 20 A is
[2 marks]
(a) 14.1 A
(b) 17.3 A
(c) 22.4 A
(d) 30.0 A

asked in Electrical Engineering, 2004

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