Industrial Electronics Practice Quiz 09

Industrial Electronics Practice Quiz 09

Welcome to ECE Board Exam Practice Quiz for Industrial Electronics. This set of practice quiz 9 will test your competence on the theories, concepts and problem solving involving Industrial Electronics. The objectives and goals of this quiz is to help engineering students familiarize concepts and theories as well as develop problem solving skills when answering questions related to the Industrial Electronics.

Industrial Electronics Test Bank

In this section are compiled practice quiz for Industrial Electronics that could be able to enhance your knowledge and skills in your preparation for the ECE Board Exam. The goal is to add thousands of questions for you to be familiarized and hopefully help you to be prepared. I am looking forward that this practice quiz will give you an additional confidence in taking your upcoming Engineering Board Exam.

Guidelines:
  • Read and understand each question before choosing the best answer.
  • The correct answer will be reveal after you have chosen your answer for every questions
  • There is no time limit, answer the questions at your own pace.
  • Once all questions are answered, you will be shown your rating.
  • You have to get 70% of the total items to pass the quiz.
  • You can re-take the quiz as many times as you want or until you are satisfied of your rating.
  • Comment us your thoughts, scores, ratings, and questions about the quiz in the comments section below!

Choose the letter of the best answer in each questions.

What is the typical value of the interbase resistance of UJTs?
20 KΩ
Between 4 to 4 KΩ
4 KΩ
Between 4 to 10 KΩ

Correct!

Wrong!

Which of the following devices has nearly the same turn-on time as turn-off time?
SCR
GTO
SCS
LASCR

Correct!

Wrong!

The SCR can exercise control over _________ of ac supply.
positive or negative half-cycle
both positive and negative half-cycles
only positive half-cycle
only negative half-cycle

Correct!

Wrong!

For an SCR, dv/dt protection is achieved through the use of
RL in series with SCR
RC across SCR
L in series with SCR
RC in series with SCR

Correct!

Wrong!

Which of the following devices does not have a cathode terminal?
SCR
SCS
TRIAC
Shockley diode

Correct!

Wrong!

Power electronics deals with the control of ac power at what frequencies essentially?
20 KHz
1000 KHz
Frequencies less than 10 Hz
60 Hz frequency

Correct!

Wrong!

What is basically a two-terminal parallel-inverse combination of semiconductor layers that permits triggering in either direction?
DIAC
TRIAC
QUADRAC
Shockley Diode

Correct!

Wrong!

A normally operated SCR has an anode which is _________ with respect to cathode.
negative
positive
at zero potential
at infinite potential

Correct!

Wrong!

What is the resistance of a certain 4-layer diode in the forward-blocking region if VAK = 15 V and IA = 1 uA?
15 Ω
21.21 MΩ
15 M Ω
10.61 MΩ

Correct!

Wrong!

In a certain UJT rB1 is 2.5 kΩ and rB2 = 4 kΩ. What is the intrinsic standoff ratio?
0.61538
0.38461
2.6
0.8125

Correct!

Wrong!

Which of the following is the normal way to turn on a diac?
By breakover voltage
By gate voltage
By gate current
By anode current

Correct!

Wrong!

How many pn junction does SCRs have?
Two
Four
Three
Five

Correct!

Wrong!

The turn-off time of thyristor is 30 m sec at 50°C. Its turn-off time at 100°C is
same
15 m sec
60 m sec
100 m sec

Correct!

Wrong!

The four-layer devices with a control mechanism are commonly referred to as _______.
thyristors
transistors
diodes
None of these

Correct!

Wrong!

It is the minimum additional current that can make up for any missing input (gate) current in order to keep the device ON.
leakage current
ac current
holding current
switching current

Correct!

Wrong!

The function of snubber circuit connected across the SCR is to:
Suppress dv/dt
Increase dv/dt
Decrease dv/dt
Decrease di/dt

Correct!

Wrong!

SCRs have been designed to control powers as high as _______, with individual ratings as high as ________ at _______.
1800 MW, 10 A, 2000 V
1800 MW, 2000 A, 10 V
10 MW, 2000 A, 1800 V
2000 MW, 10 A, 1800 V

Correct!

Wrong!

SCR is a rectifier constructed of silicon material. Silicon is chosen because
it is the most abundant material
of its strength and ruggedness
it is much cheaper than any other material
of its high temperature and power capabilities

Correct!

Wrong!

An effect that reduces the possibility of accidental triggering of the SCS.
Miller effect
Rate effect
End effect
Flywheel effect

Correct!

Wrong!

Which of the following can change the angle of conduction in SCR?
Changing anode voltage
Changing gate voltage
Reverse biasing the gate
Changing cathode voltage

Correct!

Wrong!

The minimum operating voltage of the UJT is typically ________ that of a similarly rated PUT.
lower than
the same as
higher than
None of these

Correct!

Wrong!

What is a solid state equivalent of a gas filled triode?
Triac
Thyristor
SCR
SCS

Correct!

Wrong!

You have the schematic diagram of several types of circuits. Which of these circuits most likely uses a triac?
an oscillator
an ac motor control
a programmable oscillator
an amplifier

Correct!

Wrong!

It is like a low current SCR with two gate terminals.
UJT
PUT
SCR
SCS

Correct!

Wrong!

It is a three-terminal silicon diode with the ability to control a large ac power with a small signal.
TRIAC
SCR
UJT
SCS

Correct!

Wrong!

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