When thyristors are connected in parallel, the current distribution may become n

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Question
When thyristors are connected in parallel, the current distribution may become non-uniform due to
Options
A. inductive effect of current carrying conductors
B. capacitive effect of current carrying conductors
C. both inductive and capacitive effects
D. none of the above

Correct Answer

inductive effect of current carrying conductors

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2. 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

3. 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

4. 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

5. 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

6. In a bridge inverter with single pulse width modulation
Options
A. the output frequency is equal to frequency of reference signal
B. the output frequency is equal to frequency of control signal
C. either (a) or (b)
D. neither (a) nor (b)

7. For a single phase half wave converter feeding a resistive load, the firing angle a. The waveshape in below figure is for
Options
A. output voltage
B. input voltage
C. voltage drop across thyristor
D. none of the above

9. A LASCR has
Options
A. 4 semiconductor layers and 3 junctions
B. 3 semiconductor layers and 2 junctions
C. 2 semiconductor layers and 2 junctions
D. any of these depending on the rating

10. Assertion (A): Thyristors can be used in controlled heating, excitation systems of alternators, speed control of motors and HVDC
Reason (R): A static var system using thyristors is very commonly used in high voltage ac systems.
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

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