In a 3 phase bridge inverter, the gating signals for the three phases have a pha

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Question
In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of
Options
A. 120�
B. 60�
C. 240�
D. any of the above

Correct Answer

120�

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2. A single phase dual converter consists of
Options
A. two fully controlled converters connected in parallel
B. two fully controlled converters connected in antiparallel
C. two fully controlled semiconverters connected in antiparallel
D. two fully controlled semiconverters connected in parallel

4. Assertion (A): A class C chopper can operate in first and second quadrants
Reason (R): A class B chopper operates only in second quadrant.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

6. In a single phase cycloconverter with centre tapped transformer
Options
A. all thyristors carry currents for equal duration
B. the durations of currents in all thyristors may or may not be equal
C. the durations of currents in all thyristors cannot be equal
D. the duration of currents in all thyristors must be equal for satisfactory operation

7. In a full bridge circuit supplying an RLC under damped circuit
Options
A. the waveshapes of output voltage and load current are square
B. the waveshapes of output voltage and load current are sinusoidal
C. the waveshapes of output voltage is square but the waveshape of load current is nearly sinusoidal
D. none of the above

8. The method of triggering SCS is
Options
A. application of positive pulse at cathode gate or negative pulse at anode gate
B. application of pulse at anode gate
C. application of pulse at cathode gate
D. application of low voltage at anode

9. A fully controlled bridge converter is feeding an RLE load. The load current is I₀. The input voltage is V_m sin ?t. The KVL equation to find firing angle a is
Options
A. cos a = E + I₀R
B. cos a = E + I₀R
C. cos a = E - I₀R
D. cos a = E - I₀R

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