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691.

The flux per pole in a synchronous motor with the field circuit ON and the stator disconnected from the supply is found to be 25 mWb. When the stator is connected to the rated supply with the field excitation unchanged, the flux per pole in the machine is found to be 20 mWb while the motor is running on no load. Assuming no load losses to be zero, the no load current down by the motor from the supply [2 marks]
(a) lags the supply voltage
(b) leads the supply voltage
(c) is in phase with the supply voltage
(d) is zero

asked in Electrical Engineering, 2002

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692.

The rotor of a three phase, 5 kW, 400V, 50 Hz, slip ring induction motor is wound for 6 poles while its stator is wound for 4 poles. The approximate average no load steady state speed when this motor is connected to 400V, 50 Hz supply is [2 marks]
(a) 1500 rpm
(b) 500 rpm
(c) 0 rpm
(d) 1000 rpm

asked in Electrical Engineering, 2002

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693.

A 200 V, 2000 rpm, 10A, separately excited dc motor has an armature resistance of 2Ω. Rated dc voltage is applied to both the armature and field winding of the motor. If the armature drawn 5A from the source, the torque developed by the motor is [2 marks]
(a) 4.30 Nm
(b) 4.77 Nm
(c) 0.45 Nm
(d) 0.50 Nm

asked in Electrical Engineering, 2002

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694.

A series R-L-C circuit has R = 50Ω, L = 100 µH and C = 1 µF. the lower half power frequency of the circuit is [2 marks]
(a) 30.55 kHz
(b) 3.055 kHz
(c) 51.92 kHz
(d) 1.92 kHz

asked in Electrical Engineering, 2002

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695.

A first order, low pass filter is given with R = 50 Ω and C = 5 µF. What is the frequency at which the gain of the voltage transfer function of the filter is 0.25? [2 marks]
(a) 4.92 kHz
(b) 0.49 kHz
(c) 2.46 kHz
(d) 24.6 kHz

asked in Electrical Engineering, 2002

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696.

In the circuit shown in Fig, what value of C will cause a unity power factor at the ac source?

[2 marks]
(a) 68.1 µF
(b) 165 µF
(c) 0.681 µF
(d) 6.81 µF

asked in Electrical Engineering, 2002

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