A 3 phase semiconverter when supplying a certain load has a rectification efficiency of 0.6 and transformer utilisation factor of 0.35. When a 3 phase full converter is supplying the same load
Answer: A
No answer description available for this question.
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The terminals of a power MOSFET are called
Answer: B
In a MOSFET terminals are source, gate, drain irrespective of rating.
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The number of doped regions in a SCR is
Answer: C
p = n = p = n.
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A single phase half wave regulator uses
Answer: C
Regulation is possible only in positive half cycle.
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A single phase half wave controlled rectifier circuit has an R-L load. A freewheeling diode is also in the circuit. When freewheeling diode is conducting the SCR
Answer: B
Free wheeling diode is forward biased only when SCR is reverse biased.
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Assertion (A): The surge current which an SCR can withstand is much higher than rms on state current.
Reason (R): The duration of surge current is very small.
Answer: A
Since duration of surge current is small, the associated energy is small.
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Which of these triggering methods for series connected SCRs use LASCR in the gate circuit?
Answer: D
Optical triggering uses LASCR.
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Present day HVDC converters are all
Answer: C
To reduce ripple 12 pulse converters are used.
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Current derating may be necessary when thyristors are operating in
Answer: B
Since current does not divide equally, current derating is necessary.
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The total number of leads in reverse conducting thyristor is
Answer: B
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