MCQ Hive - Changing Pathways to Wisdom

The power demand can be estimated approximately by___________?

A. Load survey method
B. Mathematical method
C. Statistical method
D. Economic parameters

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What is the advantage of HRC fuses over Rewirable fuses?

A. High speed operation
B. High rupturing capacity
C. No ageing effect
D. All of the above

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A rectifier with an external low pass filter is an example of______________?

A. Indirect switch matrix circuits
B. Direct switch matrix circuits
C. Embedded converters
D. All of these

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CB used for over current protection of thyristor operates when the fault current is__________?

A. Of long period
B. Of short duration
C. Both (a) and (b)
D. Neither (a) nor (b)

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A power semiconductor may undergo damage due to____________?

A. High di/dt
B. High dv/dt
C. Low di/dt
D. Low dv/dt

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When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ___________?

A. Cb
B. Snubber circuit
C. Voltage clamping device
D. fast acting current limiting device (facl fuse)

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Which of the following is disadvantage of fast recovery diodes?

A. Recovery is only 5 μs
B. Recovery is only 50 μs
C. Doping is carried out
D. None of these

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Leakage current flows through the thyristor in_________?

A. Forward blocking mode
B. reverse blocking mode
C. both forward and reverse blocking mode
D. Forward conduction mode

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Which triggering is the most reliable____________?

A. Forward voltage triggering
B. gate triggering
C. dv / dt triggering
D. thermal triggering

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Which of following devices has highest di/dt and dv/dt capability?

A. Sit
B. Sith
C. Gto
D. Scr

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