Question 11 : A single phase full-converter using R load is a _________ quadrant converter and that using an RL load without FD is a __________ quadrant converter
1. one, one
2. two, one
3. one, two
4. two, two
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Question 12 : A three-phase half-wave controlled converter is fed from a 3-phase, 400 V source and is connected to a load which takes a constant current of 36 A. Find,the value of average output voltage and average current rating of SCR for a firing angle of 30°.
1. 234 V, 36 A
2. 234 V, 12 A
3. 135 V, 36 A
4. 135 V, 12 A
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Question 13 : A single phase full converter, feeds power to a RLE load with R = 6 Ω and E = 60 V. The supply voltage is 230 V AC and the firing angle is 50°. Find the power delivered to the battery.
1. 542 W
2. 100 W
3. 960 W
4. 730 W
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Question 14 : The PIV experienced by each SCRs in M-3 converter is __________ times that in a 3-phase full converter having the same output voltage.
1. 0.5
2. 1
3. 2
4. 1.5
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Question 15 : All the modern AC-DC converters are using GTOs instead of SCRs because
1. Temperature is an issue in SCRs
2. Switching losses are high in SCRs
3. GTOs have reliable commutation
4. GTOs are cheaply available today
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Question 16 : The reactor in circulating current type dual converters
1. increases losses
2. reduces power factor
3. increase the weight of the circuit
4. all of the above
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Question 17 : A single phase full wave mid-point SCR converter, uses a 230/200 V transformer with the centre tap on the secondary side. The P.I.V. per SCR is
1. 100 V
2. 214V
3. 141V
4. 282V
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Question 18 : Circulating current flows
1. from load to converters
2. from one converter to another converter
3. in the whole circuit
4. none of the mentioned
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Question 19 : A three phase full converter will require __________ number of SCRs.
1. 3
2. 6
3. 9
4. 2
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Question 20 : A single phase half-wave controlled rectifier has 400 sin314t as the input voltage and R as the load. For a firing angle of 60°,the average output voltage is
1. 200/π
2. 300/π
3. 100/π
4. 400/π
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