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Test: Gating Circuits


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10 Questions MCQ Test Power Electronics | Test: Gating Circuits

Test: Gating Circuits for Electrical Engineering (EE) 2022 is part of Power Electronics preparation. The Test: Gating Circuits questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Gating Circuits MCQs are made for Electrical Engineering (EE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Gating Circuits below.
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Test: Gating Circuits - Question 1

 If the RC firing circuit used for firing an SCR is to be used to fire a TRIAC then

Detailed Solution for Test: Gating Circuits - Question 1

The TRIAC is a bidirectional SCR, hence it will need gating in both the directions. This can be achieved by replacing the diode by a DIAC (bidirectional diode).

Test: Gating Circuits - Question 2

In the thyristor gating circuit, the supply to the pulse amplifier is provided by the

Detailed Solution for Test: Gating Circuits - Question 2

Isolation transformer provides the supply to the amplifier and also provides the necessary isolation for the load and triggering circuit.

Test: Gating Circuits - Question 3

In the thyristor gating circuit, the ZCD is used to

Detailed Solution for Test: Gating Circuits - Question 3

It is used to convert the AC synchronizing input voltage into ramp voltage & synchronizes it with the zero crossing of the AC supply.

Test: Gating Circuits - Question 4

 The firing-angle delay is

Detailed Solution for Test: Gating Circuits - Question 4

If Ec is lowered the firing angle decreases & vice-verse.

Test: Gating Circuits - Question 5

The pulse gating is not suitable of

Detailed Solution for Test: Gating Circuits - Question 5

It is not suitable of RL load because initiation of SCR conduction is not well defined in these types of loads.

Test: Gating Circuits - Question 6

In case of a cosine firing scheme, __________ is used to get a cosine wave

Detailed Solution for Test: Gating Circuits - Question 6

The Sync. Transformer is connected to a integrator to obtain a cosine-wave.

Test: Gating Circuits - Question 7

If the gating circuits generator negative pulses, then those can be removed by using

Detailed Solution for Test: Gating Circuits - Question 7

The clippers can be used to clip the negative part

Test: Gating Circuits - Question 8

The improved version of the UJT oscillator triggering circuit is the

Detailed Solution for Test: Gating Circuits - Question 8

The ramp & pedal triggering is the improved version of the UJT oscillator triggering circuit.

Test: Gating Circuits - Question 9

RB1 = 3 kΩ & RB2 = 6 kΩ. Find the intrinsic stand-off ratio (η) of the UJT.

Detailed Solution for Test: Gating Circuits - Question 9

η = RB1/(RB1+RB1).

Test: Gating Circuits - Question 10

The decaying factor in the wave shape of the output pulses from the pulse transformer is its

Detailed Solution for Test: Gating Circuits - Question 10

L is the decaying factor in the waveform which emerge from the PT.

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