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493.

A variable speed drive rated for 1500 rpm, 40 Nm is reversing under no load. Figure shows the reversing torque and the speed during the transient. The moment of inertia of the drive is

[2 marks]
(a) 0.048 kg m²
(b) 0.064 kg m²
(c) 0.096 kg m²
(d) 0.128 kg m²

asked in Electrical Engineering, 2004

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494.

A single-phase half-controlled rectifier is driving a separately excited dc motor. The dc motor has a back emf constant of 0.5 V/rpm. The armature current is 5A without any ripple. The armature resistance is 2Ω. The converter is working from a 230 V, single-phase ac source with a firing angle of 30°. Under this operating condition, the speed of the motor will be
[2 marks]
(a) 339 rpm
(b) 359 rpm
(c) 366 rpm
(d) 386 rpm

asked in Electrical Engineering, 2004

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495.

Figure shows a chopper. The device S1 is the main switching device. S2 is the auxiliary commutation device. S1 is rated for 400V, 60A. S2 is rated for 400V, 30 A. the load current is 20 A. The main device operates with a duty ratio of 0.5. The peak current through S1 is

[2 marks]
(a) 10 A (b) 20 A (c) 30 A (d) 40 A

asked in Electrical Engineering, 2004

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496.

Figure shows a chopper operating from a 100 V dc input. The duty ratio of the main switch S is 0.8. The load is sufficiently inductive so that the load current is ripple free. The average current through the diode D under steady state is

[2 marks]
(a) 1.6 A
(b) 6.4 A
(c) 8.0 A
(d) 10.0 A

asked in Electrical Engineering, 2004

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497.

The triac circuit shown in figure controls the ac output power to the resistive load. The peak power dissipation in the load is

[2 marks]
(a) 3968 W
(b) 5290 W
(c) 7935 W
(d) 10580 W

asked in Electrical Engineering, 2004

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498.

A MOSFET rated for 15 A, carries a periodic current as shown in figure. The ON state resistance of the MOSFET is 0.15Ω. The average ON state loss in the MOSFET is

[2 marks]
(a) 33.8 W
(b) 15.0 W
(c) 7.5 W
(d) 3.8 W

asked in Electrical Engineering, 2004

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