Question 1 : Find the expression of the rms value of output voltage for a single-phase M-2 type rectifier with RL load and continues load current. Transformer ratio is 1:1 with supply voltage Vs = Vm sinωt
1. Vm/√2
2. Vs
3. 2Vs
4. Vs/√2
View Answer   Discuss with Members

Question 2 : A single-phase semi-converter is having continuous conduction, as such each thyristor will conduct for an angle of
1. α
2. π
3. α+π
4. π-α
View Answer   Discuss with Members

Question 3 : A single-phase asymmetrical semi-converter employs
1. one SCR and one diode in each leg
2. two SCRs in one leg and two diodes in the other
3. two SCRs in both the legs
4. two diodes in both the legs
View Answer   Discuss with Members

Question 4 : In case of circulating current type dual converters, the reactor is inserted between
1. supply and converter
2. across the load
3. between the converters
4. no reactor is used in case of circulating type dual converter
View Answer   Discuss with Members

Question 5 : A single-phase half-wave thyristor circuit with R load is triggered at an angle of α = 0°. As such, the maximum value of the average output voltage would be given by
Consider Vs = Vm sinωt.
1. Vm
2. 2Vm/π
3. Vm/π
4. Vm/α
View Answer   Discuss with Members

Question 6 : A single-phase half-wave rectifier with a FD is supplied by Vs = 240 V, 50 Hz, AC source with a load R = 10 Ω, L = 0.8 mH. The firing angle is so adjusted such that the output voltage obtained is 100 V. Find the firing angle.
1. 62°
2. 102°
3. 31°
4. 47°
View Answer   Discuss with Members

Question 7 : Choose the correct statement.
1. Circulating current type is faster in operation
2. Non-circulating current type is faster in operation
3. Both the types have the same speed of operation
4. Circulating current improves power factor
View Answer   Discuss with Members

Question 8 : A single-phase symmetrical semi-converter employs
1. one SCR and one diode in each leg
2. two SCRs and two diodes in each leg
3. two SCRs in each leg
4. two diodes in each leg
View Answer   Discuss with Members

Question 9 : What causes circulating current in dual converters?
1. Temperature issues
2. Inductance in load circuit
3. Out of phase voltages from both the converters
4. none of the mentioned
View Answer   Discuss with Members

Question 10 : For the same triggering angle and ratings
1. a semi-converter operates at lower output voltage than a full converter
2. a semi-converter operates at higher output voltage than a full converter
3. a semi-converter has lower values of input p.f as compared to a full converter
4. a semi-converter has more THD as compared to a full converter
View Answer   Discuss with Members