In a multiphase chopper, the different choppers operate in
Answer: B
Only one chopper operates at one time.
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The terminals of a power BJT are called
Answer: A
In a BJT terminals are emitter, base and collector irrespective of rating.
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A thyristor has internal power dissipation of 40W and is operated at an ambient temperature of 20°C. If thermal resistance is 1.6° C/W, the junction temperature is
Answer: D
No explanation.
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In a 3 phase full wave regulator feeding a star connected resistance load the input voltage is 400 V line to line. The firing angle is 160°. The line to line output voltage would be
Answer: D
In a three-phase full wave regulator, output voltage is zero if a ≥ 150°.
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An SBS can conduct is one direction only.
Answer: B
It is a bilateral switch.
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Assertion (A): An ideal rectifier should have unity harmonic factor
Reason (R): An ideal rectifier should have unity displacement factor.
Answer: D
Ideal rectifier should have zero harmonic factor and unity displacement factor.
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A reactor is used in a dual converter operating in non-circulating current mode.
Answer: B
Reactor is used only for circulating current mode.
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A 3 phase bridge inverter is fed by 400 V battery. The load is star connected and has a resistance of 10 Ω per phase. The peak value of load current is
Answer: B
Two resistances are in series at any time.
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A single phase half wave controlled rectifier circuit has a free wheeling diode. The load is a combination of R and L. The firing angle is a. The period of conduction of SCR and free wheeling diode respectively are
Answer: A
SCR conducts from a to p and free wheeling diode from p to (2p + a).
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