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535.

A 8 pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is [2 marks]
(a) 96V
(b) 192V
(c) 384V
(d) 768V

asked in Electrical Engineering, 2004

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536.

For a 1.8°, 2-phase bipolar stepper motor, the stepping rate is 100 steps/second. The rotational speed of the motor in rpm is
[2marks]
(a) 15
(b) 30
(c) 60
(d) 90

asked in Electrical Engineering, 2004

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537.

A 400V, 15 kW, 4 pole, 50 Hz, Y-connected induction motor has full load slip of 4%. The output torque of the machine at full load is [2 marks]
(a) 1.66 Nm
(b) 95.50 Nm
(c) 99.47 Nm
(d) 624.73 Nm

asked in Electrical Engineering, 2004

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538.

Two 3-phase, Y-connected alternators are to be paralleled to a set of common bus bars. The armature has a per phase synchronous reactance of 1.7Ω and negligible armature resistance. The line voltage of the first machines is adjusted to 3300 V and that of the second machine is adjusted to 3200 V. the machine voltages are in phase at the instant they are paralleled. Under this condition, the synchronizing current per phase will be
[2 marks]
(a) 16.98 A
(b) 29.41 A
(c) 33.96 A
(d) 58.82 A

asked in Electrical Engineering, 2004

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539.

A single-phase, 230 V, 50 Hz, 4 pole, capacitor-start induction motor has the following stand still impedances
Main winding Z_m =6.0 + j4.0Ω
Auxiliary winding Z_a = 8.0 + j6.0Ω
The value of the starting capacitor required to produce 90° phase difference between the currents in the main and auxiliary windings will be
[2 marks]
(a) 176.84 µF
(b) 187.24 µF
(c) 265.26 µF
(d) 280.86 µF

asked in Electrical Engineering, 2004

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540.

The resistance and reactance of a 100 kVA 11000|400V, Δ -Y distribution transformer are 0.02 and 0.07 pu respectively. The phase impedance of the transformer referred to the primary is [2 marks]
(a) (0.02 + j0.07)Ω
(b) (0.55 + j1.925)Ω
(c) (15.125 + j52.94)Ω
(d) (72.6 + j254.1)Ω

asked in Electrical Engineering, 2004

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