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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Tests  >  Test: Power Transistors - Electrical Engineering (EE) MCQ

Test: Power Transistors - Electrical Engineering (EE) MCQ


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20 Questions MCQ Test - Test: Power Transistors

Test: Power Transistors for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Test: Power Transistors questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Power Transistors MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Power Transistors below.
Solutions of Test: Power Transistors questions in English are available as part of our course for Electrical Engineering (EE) & Test: Power Transistors solutions in Hindi for Electrical Engineering (EE) course. Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free. Attempt Test: Power Transistors | 20 questions in 15 minutes | Mock test for Electrical Engineering (EE) preparation | Free important questions MCQ to study for Electrical Engineering (EE) Exam | Download free PDF with solutions
Test: Power Transistors - Question 1
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Which of the following devices does not belong to the transistor family?

Detailed Solution for Test: Power Transistors - Question 1

GTO is gate turn off transistor, it belongs to the Thyristor family. All the other devices belong to the transistor family.

Test: Power Transistors - Question 2
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 A power transistor is a

Detailed Solution for Test: Power Transistors - Question 2

 It has three layers p-n-p or n-p-n forming two p-n junctions.

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Test: Power Transistors - Question 3
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In a power transistor, ____ is the controlled parameter.

Detailed Solution for Test: Power Transistors - Question 3

The collector current is the controlled parameter.

Test: Power Transistors - Question 4
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A power transistor is a _________ device.
Detailed Solution for Test: Power Transistors - Question 4

 Power transistor is simply many BJT’s connected in series parallel on a single silicon chip for power applications. It is a three terminal, bipolar, current controlled device.

Test: Power Transistors - Question 5
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 In a power transistor, _________ is the controlling parameter.
Detailed Solution for Test: Power Transistors - Question 5

The base current controls the collector current. Hence, the base current Ib is the controlling parameter.

Test: Power Transistors - Question 6
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In a power transistor, the IB vs VBE curve is
Detailed Solution for Test: Power Transistors - Question 6

The B-E junction of a BJT resembles a p-n junction diode, hence the curve.

Test: Power Transistors - Question 7
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For a power transistor, if the base current IB is increased keeping VCE constant, then
Detailed Solution for Test: Power Transistors - Question 7

Ic is directly proportional to Ic.

Test: Power Transistors - Question 8
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The forward current gain α is given by
Detailed Solution for Test: Power Transistors - Question 8

Collector current by emitter current is the current gain, its value is close to one but never greater than.

Test: Power Transistors - Question 9
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The value of β is given by the expression
Detailed Solution for Test: Power Transistors - Question 9

Collector current by the base current is beta, its value is in the range 50 to 300.

Test: Power Transistors - Question 10
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A power BJT is used as a power control switch by biasing it in the cut off region (off state) or in the saturation region (on state). In the on state
Detailed Solution for Test: Power Transistors - Question 10

When base-emitter & base-collector junctions are forward biased only than both the p-n junctions are forward biased and the device is on.

Test: Power Transistors - Question 11
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 For a power transistor, if the forward current gain α = 0.97, then β = ?
Detailed Solution for Test: Power Transistors - Question 11

 Use the relation α = β/(β+1).

Test: Power Transistors - Question 12
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The power electronics devices have a very high efficiency because
Detailed Solution for Test: Power Transistors - Question 12

They are efficient due to their higher transition speeds.

Test: Power Transistors - Question 13
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For a power transistor, which of the following relations is true?
Detailed Solution for Test: Power Transistors - Question 13

 Practically speaking Ie = Ib+Ic. Ie is the highest as it is the sum of the collector and base currents. The base current is the smallest.

Test: Power Transistors - Question 14
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High frequency operation of any device is limited by the
Detailed Solution for Test: Power Transistors - Question 14

Lower the switching losses higher the frequency of operation of the device.

Test: Power Transistors - Question 15
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The instantaneous power loss during the delay time of a transistor is given by
Detailed Solution for Test: Power Transistors - Question 15

 During the delay time only the collector current flows & base to emitter voltage is zero.

Test: Power Transistors - Question 16
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For a power transistor, the average power loss during the delay time can be given by the equation
Detailed Solution for Test: Power Transistors - Question 16

During the delay time only, the collector current flows & base to emitter voltage is zero. Hence the average power can be found, simply by integrating it over the total delay time & dividing by the base time period.

Test: Power Transistors - Question 17
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A 1mv of i/p gives an output of 1V, the voltage gain as such would be
Detailed Solution for Test: Power Transistors - Question 17

1V/1mv = 1000.

Test: Power Transistors - Question 18
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Which of the following relations is true for a BJT?
Detailed Solution for Test: Power Transistors - Question 18

The collector & emitter current differ only by the base current, which is very very small.

Test: Power Transistors - Question 19
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Choose the correct statement
Detailed Solution for Test: Power Transistors - Question 19

Unlike the thyristor devices, all the transistor family devices remain in the conducting state as long as the firing pulses are applied. This is a very important property of the transistor devices.

Test: Power Transistors - Question 20
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 Let’s say that a transistor is operating at the middle of the load line, then a decrease in the current gain would
Detailed Solution for Test: Power Transistors - Question 20

The current gain would decreases the collector current, shifting the Q point below.

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