In a 3 phase fully controlled converter the firing frequency is
Answer: B
It is a 6 pulse converter.
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All inverters use forced commutation.
Answer: B
Line commutated inverters are also used especially in HVDC.
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A single phase half wave converter is used to charge a battery of 50 V. The thyristor is continuously fired by dc signal. Input voltage is v = Vm sin ωt. The thyristor will conduct
Answer: B
Thyristor can conduct only when it is forward biased. This occurs only when v > 50 V.
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Assertion (A): Inverters and choppers use fast switching thyristors
Reason (R): Fast switching SCR has low turn off time.
Answer: A
Low turn off time enables fast switching.
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Assertion (A): A cycloconverter may be line commutated or forced commutated
Reason (R): A step up cycloconverter requires forced commutation.
Answer: A
No answer description available for this question.
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Assertion (A): A high dv/dt may cause triggering of a thyristor.
Reason (R): A high dv/dt results in charging current in the thyristor.
Answer: A
The charging current may cause triggering.
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Induction heating systems require low frequency inverters.
Answer: B
It uses high frequency inverter.
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Which of the following are included in the architecture of computer?
1.Addressing mode, design of CPU
2.Instruction set, data format
3.Secondary memory, operating system
Select the correct answer using the codes given below:
Answer: A
Addressing mode, CPU design, Data formats, instruction set are part of Computer Architecture.
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The phenomenon of overlap in converter operation due to
Answer: B
Source inductance delays turn off and hence causes overlap.
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Thyristors are not suitable for logic circuits.
Answer: B
Thyristors can be used for logic circuits.
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