Welcome to ECE Board Exam Practice Quiz for Industrial Electronics. This set of practice quiz 10 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.
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PREVIOUS: Industrial Electronics Practice Quiz 09
In a SCR circuit, the angle of conduction can be changed by changing
anode voltage
anode current
forward current rating
gate current
Correct!
Wrong!
The peak and valley currents of the PUT are typically ________ those of a similarly rated UJT.
lower than
the same as
higher than
None of these
Correct!
Wrong!
Which of the following is a four-layer diode with an anode gate and a cathode gate?
SCS
SCR
SBS
SUS
Correct!
Wrong!
To turn on the UJT, the forward bias on emitter diode should be _______ the peak point voltage.
more than
less than
equal to
twice
Correct!
Wrong!
The PUT (programmable unijunction transistor) is actually a type of:
UJT thyristor
FET device
TRIAC
SCR
Correct!
Wrong!
The silicon-controlled switch (SCS) is similar in construction to the
triac
diac
SCR
4-layer diode
Correct!
Wrong!
What is the typical value of the reverse resistance of SCRs?
1 Ω to 10 Ω
100 Ω to 1 kΩ
1 kΩ to 50 kΩ
100 kΩ or more
Correct!
Wrong!
The smallest amount of current that the cathode-anode can have, and still sustain conduction of an SCR is called the:
maximum forward current
maximum forward gate current
holding current
reverse gate leakage current
Correct!
Wrong!
The method(s) for turning off an SCR is (are) categorized as ________.
current interruption
forced commutation
both current interruption and forced commutation
None of these
Correct!
Wrong!
An SCR whose state is controlled by the light falling upon a silicon semiconductor layer of the device.
SCS
GTO
Thyristor
LASCR
Correct!
Wrong!
The UJT operates in what region after peak point?
Cut off
Negative resistance
Saturation
Positive resistance
Correct!
Wrong!
Which of the following devices has (have) four layers of semiconductor materials?
Silicon-controlled switch (SCS)
Gate turn-off switch (GTO)
Light-activated silicon-controlled rectifier (LASCR)
All of these
Correct!
Wrong!
When SCR starts conducting, then _______ losses all control.
gate
anode
cathode
anode supply
Correct!
Wrong!
Which of the following is (are) the advantages of the SCS over a corresponding SCR?
Reduced turn-off time
Increased control and triggering sensitivity
More predictable firing situation
All of these
Correct!
Wrong!
Which of the following conditions is necessary for triggering system for thyristors?
It should be synchronized with the main supply
It must use separate power supply
It should provide a train of pulses
None of these
Correct!
Wrong!
An SCR is a member of what family?
Thyrector
Thyratron
Thyristor
Transistor
Correct!
Wrong!
An SCR is made of what material?
Silicon
Carbon
Germanium
Gallium-arsenide
Correct!
Wrong!
For a certain 4-layer diode in the forward-blocking region VAK = 15 V and IA = 1 uA. What is the peak-point voltage if VBB = 15 V?
10.605
5.76912
6.46915
0.8125
Correct!
Wrong!
Which device does not have a gate terminal?
Triac
SCR
FET
Diac
Correct!
Wrong!
What is that voltage above when the SCR enters the conduction region?
Reverse breakover voltage
Forward breakover voltage
Holding voltage
Trigger voltage
Correct!
Wrong!
What is the frequency range of application of SCRs?
About 10 kHz
About 50 kHz
About 250 kHz
About 1 mHz
Correct!
Wrong!
Determine RB1 for a silicon PUT if it is determined that h = 0.84, VP = 11.2 V, and RB2 = 5 kΩ.
12.65 kΩ
16.25 kΩ
20.00 kΩ
26.25 kΩ
Correct!
Wrong!
A technique use to turn off a thyristor using an external circuit which causes the anode to become negatively biased.
force commutation
reverse triggering
negative feedback
doping
Correct!
Wrong!
When the temperature increases, the intrinsic standoff ratio
increases
decreases
essentially constant
becomes zero
Correct!
Wrong!
A UJT is sometimes called a _______ diode.
double-based
single-based
a rectifier
a switching diode
Correct!
Wrong!
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Industrial Electronics – Quiz 10
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