Test: Gating Circuits

# Test: Gating Circuits

Test Description

## 10 Questions MCQ Test Power Electronics | Test: Gating Circuits

Test: Gating Circuits for Electrical Engineering (EE) 2023 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) 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Gating Circuits below.
Solutions of Test: Gating Circuits questions in English are available as part of our Power Electronics for Electrical Engineering (EE) & Test: Gating Circuits solutions in Hindi for Power Electronics course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Gating Circuits | 10 questions in 10 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study Power Electronics for Electrical Engineering (EE) Exam | Download free PDF with solutions
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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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## Power Electronics

5 videos|39 docs|63 tests