MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
Quiz
Electrical Engineering
Power Electronics
Quiz 1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Q.1
A diac has ___________ semiconductor layers
Three
Two
Four
None of the above
Q.2
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.
Increases
Decreases
Remains the same
None of the above
Q.3
When the temperature increases, the intrinsic stand off ratio ___________.
Increases
Decreases
Essentially remains the same
None of the above
Q.4
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.
Less than
Equal to
More than
None of the above
Q.5
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________
Remains the same
Is decreased
Is increased
None of the above
Q.6
The triac is ___________.
Like a bidirectional SCR
A four-terminal device
Not a thyristor
None of the above
Q.7
Power electronics essentially deals with control of a.c. power at ___________.
Frequencies above 20 kHz
Frequencies above 1000 kHz
Frequencies less than 10 Hz
50 Hz frequency
Q.8
A diac is ___________ switch
An c.
A d.c.
A mechanical
None of the above
Q.9
In a UJT, the p-type emitter is ___________ doped
Lightly
Heavily
Moderately
None of the above
Q.10
The device that does not have the gate terminal is ___________.
Triac
FET
SCR
Diac
Q.11
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant
Transistor
SCR
UJT
none of the above
Q.12
The normal way to turn on a diac is by ___________.
Gate current
Gate voltage
Breakover voltage
None of the above
Q.13
Which of the following is not a characteristic of UJT?
Intrinsic stand off ratio
Negative resistance
Peak-point voltage
Bilateral conduction
Q.14
A UJT is sometimes called ___________ diode.
Low resistance
High resistance
Single-base
Double-base
Q.15
A diac is turned on by ___________.
A breakover voltage
Gate voltage
Gate current
None of the above
Q.16
A triac is equivalent to two SCRs ___________.
In parallel
In series
In inverse-parallel
None of the above
Q.17
A diac is simply ___________.
A single junction device
A three junction device
A triac without gate terminal
None of the above
Q.18
A triac has ___________ semiconductor layers.
Two
Three
Four
Five
Q.19
A Triac has three terminals viz ___________
Drain, source, gate
Two main terminal and a gate terminal
Cathode, anode, gate
None of the above
Q.20
A triac can pass a portion of ___________ half-cycle through the load.
Only positive
Only negative
Both positive and negative
None of the above
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page