Computer Programming MCQs

5739 MCQs  (Page 111 of 574)

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The capacitance of reversed bised junction J2 in a thyristor is CJ2 = 20 pF and can be assumed to be independant of the off state voltage. The limiting value of the charging current to turn on the thyristor is 16 mA. What is the critical value of dv/dt?
A. 600 v/μs
B. 800 v/μs
C. 1200 v/μs
D. 1000 v/μs
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BCT is used for____________?
A. High power phase control
B. High power current control
C. Low power current control
D. Low power phase control
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Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?
A. Vc1 > vc2 > vc3 when ig1 > ig2 > ig3.
B. vc1 > vc2 > vc3 when ig1 < ig2 < ig3.
C. Vc1 = vc2 = vc3 any value of ig.
D. Vc1 > vc2 > vc3 when ig1 ã¢â€°â¥ ig2 &atil
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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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Which triggering is the most reliable____________?
A. Forward voltage triggering
B. gate triggering
C. dv / dt triggering
D. thermal triggering
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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 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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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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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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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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Word of the Day
17 Jul
Flagrant
(of an action considered wrong or immoral) conspicuously or obviously offensive.
انتہائی برا، قابل مذمت، فاش

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