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193.

In the circuit shown in the figure, the switch is operated at a duty cycle of 0.5. A large capacitor is connected across the load. The inductor current is assumed to be continuous.
The average voltage across the load and the average current through the diode will respectively be

[2 marks]
(A) 10 V, 2A
(B) 10 V, 8 A
(C) 40 V, 2 A
(D) 40 V, 8 A

asked in Electrical Engineering, 2008

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194.

A three phase fully controlled bridge converter is feeding a load drawing a constant and ripple free load current of 10 A at a firing angle of 30°. The approximate Total Harmonic Distortion (%THD) and the rms value of fundamental component of the input current will respectively be
[2 marks]
(A) 31% and 6.8 A
(B) 31% and 7.8 A
(C) 66% and 6.8 A
(D) 66% and 7.8 A

asked in Electrical Engineering, 2008

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195.

A single phase fully controlled converter bridge is used for electrical braking of a separately excited de motor. The dc motor load is represented by an equivalent circuit as shown in the figure.
Assume that the load inductance is sufficient to ensure continuous and ripple free load current The firing angle of the bridge for a load current of I₀ = 10A will be

[2marks]
(A) 44°
(B) 51°
(C) 129°
(D) 136°

asked in Electrical Engineering, 2008

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196.

A 400 V, 500 Hz, 4 pole, 1400 rpm, star connected squirrel cage induction motor has the following parameters referred to the stator
R_r' = 1.0Ω, X_s = X_r' = 1.5Ω
Neglect stator resistance and core and rotational losses of the motor
The motor is controlled from a 3-phase voltage source inverter with constant V/f control. The stator line- to- line voltage (rms) and frequency to obtain the maximum torque at starting will be [2 marks]
(A) 20.6 V, 2.7 Hz
(B) 133.3 V, 16.7 Hz
(C) 266.6 V, 33.3 Hz
(D) 323.3V, 40.3 Hz

asked in Electrical Engineering, 2008

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197.

A single phase voltage source inverter is feeding a purely inductive load as shown in the figure. The inverter is operated at 50 Hz in 180° square wave mode. Assume that the load current does nothave any dc component. The peak value of the inductor current i₀ will be

[2 marks]
(A) 6.37 A
(B) 10 A
(C) 20 A
(D) 40A

asked in Electrical Engineering, 2008

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198.

A 220 V, 1400 rpm, 40A separately excited dc motor has an armature resistance of 0.4Ω. The motor is fed from a single phase circulating current dual converter with an input ac line voltage of 220 V (rms).
The approximate firing angles of the dual converter for motoring operation at 50% of rated torque and 1000 rpm will be [2 marks]
(A) 43°, 137°
(B) 43°, 47°
(C) 39°, 141°
(D) 39°,51°

asked in Electrical Engineering, 2008

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