UJT can be used for
Answer: A
UJT relaxation oscillator is used to provide gate pulses to SCR for triggering.
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The rated current of a thyristor is 40 A. The holding current will be about :
Answer: D
The holding current is much less then 1% of rated current.
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A dc circuit breaker must use
Answer: B
Natural commutation is possible only in ac circuits.
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A single phase full wave regulator feeds R-L load. The best gating signal is
Answer: C
To ensure proper triggering pulse train in necessary because load is R - L.
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The number of gates in an SCR is
Answer: A
No answer description available for this question.
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In a 3 phase semiconverter, the dc output voltage for a certain firing angle is 50% of the maximum possible value. The firing angle is
Answer: C
Vdc ∝ (1 + cos a). Maximum possible output voltage occurs when a = 0.
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A 3 phase induction motor is fed by a 3 phase ac regulator to change the stator voltage. The variation in speed will be more if
Answer: B
If load torque is constant, the change in speed is very small.
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Assertion (A): A GTO circuit is more compact than SCR circuit
Reason (R): A GTO can be turned off by negative gate pulse.
Answer: A
Since commutation circuit is not required, GTO circuit is compact.
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The two modes of operation of three phase bridge inverters are known as
Answer: C
In 180° mode each thyristor conducts for 180° and in 120° mode each thyristor conducts for 120°.
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A silicon controlled switch has :
Answer: C
Anode, cathode, anode gate and cathode gate.
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