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Electronics and Communication Engineering - Power Electronics

Exercise : Power Electronics - Section 6
16.
Two thyristors of the same rating and specifications
will have equal on state voltage drops
will have equal forward blocking voltage for the same current
will have different on state voltage drops
may have equal or different on state voltage drops and equal or different forward blocking voltage's for the same current
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
will be less than 100 N-m
will be more than 100 N-m
may be more or less than 100 N-m depending on motor parameters
very small
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is
36
18
12
8
Answer: Option
Explanation:
No answer description is available. Let's discuss.
19.
A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ωt. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
In a cycloconverter it is possible to vary
only output frequency
only output voltage
both output voltage and frequency but not simultaneously
both output voltage and output frequency simultaneously
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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