40 + Mcqs in Power Electronics Page 1 McqOptions

1.	A triac is equivalent to two SCRs ___________.%!
A.	In parallel
B.	In series
C.	In inverse-parallel
D.	None of the above
Answer» D. None of the above

Discussion

2.	The triac is ___________.%!
A.	Like a bidirectional SCR
B.	A four-terminal device
C.	Not a thyristor
D.	None of the above
Answer» B. A four-terminal device

Discussion

3.	When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________%!
A.	Remains the same
B.	Is decreased
C.	Is increased
D.	None of the above
Answer» C. Is increased

Discussion

4.	When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.%!
A.	High
B.	Low
C.	Extremely low
D.	None of the above
Answer» B. Low

Discussion

5.	After peak point, the UJT operates in the ___________ region.%!
A.	Cut-off
B.	Saturation
C.	Negative resistance
D.	None of the above
Answer» D. None of the above

Discussion

6.	A triac has ___________ semiconductor layers.%!
A.	Two
B.	Three
C.	Four
D.	Five
Answer» D. Five

Discussion

7.	A Triac has three terminals viz ___________%!
A.	Drain, source, gate
B.	Two main terminal and a gate terminal
C.	Cathode, anode, gate
D.	None of the above
Answer» C. Cathode, anode, gate

Discussion

8.	*$_After peak point, the UJT operates in the ___________ region.?
A.	Cut-off
B.	Saturation
C.	Negative resistance
D.	None of the above
Answer» D. None of the above

Discussion

9.	*$_When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.?
A.	High
B.	Low
C.	Extremely low
D.	None of the above
Answer» B. Low

Discussion

10.	*$_A Triac has three terminals viz ___________?
A.	Drain, source, gate
B.	Two main terminal and a gate terminal
C.	Cathode, anode, gate
D.	None of the above
Answer» C. Cathode, anode, gate

Discussion

11.	*$_A triac has ___________ semiconductor layers.?
A.	Two
B.	Three
C.	Four
D.	Five
Answer» D. Five

Discussion

12.	*$_A triac is a ___________ switch?
A.	Bidirectional
B.	Unidirectional
C.	Mechanical
D.	None of the above
Answer» B. Unidirectional

Discussion

13.	/_The device that exhibits negative resistance region is ___________.?
A.	Diac
B.	Triac
C.	Transistor
D.	UJT
Answer» E.

Discussion

14.	/_Between the peak point and the valley point of UJT emitter characteristics we have ___________ region?
A.	Saturation
B.	Negative resistance
C.	Cut-off
D.	None of the above
Answer» C. Cut-off

Discussion

15.	/_A diac is simply ___________.?
A.	A single junction device
B.	A three junction device
C.	A triac without gate terminal
D.	None of the above
Answer» D. None of the above

Discussion

16.	/_The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant?
A.	Transistor
B.	SCR
C.	UJT
D.	none of the above
Answer» C. UJT

Discussion

17.	_ Between the peak point and the valley point of UJT emitter characteristics we have ___________ region$?
A.	Saturation
B.	Negative resistance
C.	Cut-off
D.	None of the above
Answer» C. Cut-off

Discussion

18.	_ The device that exhibits negative resistance region is ___________.$?
A.	Diac
B.	Triac
C.	Transistor
D.	UJT
Answer» E.

Discussion

19.	_ The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant$?
A.	Transistor
B.	SCR
C.	UJT
D.	none of the above
Answer» C. UJT

Discussion

20.	_ A diac is simply ___________.$?
A.	A single junction device
B.	A three junction device
C.	A triac without gate terminal
D.	None of the above
Answer» D. None of the above

Discussion

21.	_ A diac has ___________ terminals.$?
A.	Two
B.	Three
C.	Four
D.	None of the above
Answer» B. Three

Discussion

22.	_A triac can pass a portion of ___________ half-cycle through the load.$?
A.	Only positive
B.	Only negative
C.	Both positive and negative
D.	None of the above
Answer» D. None of the above

Discussion

23.	_A diac is turned on by ___________.$?
A.	A breakover voltage
B.	Gate voltage
C.	Gate current
D.	None of the above
Answer» B. Gate voltage

Discussion

24.	_The device that does not have the gate terminal is ___________.$?
A.	Triac
B.	FET
C.	SCR
D.	Diac
Answer» E.

Discussion

25.	_A diac is ___________ switch$?
A.	An c.
B.	A d.c.
C.	A mechanical
D.	None of the above
Answer» B. A d.c.

Discussion

26.	_A diac has ___________ pn junctions$?
A.	Four
B.	Two
C.	Three
D.	None of the above
Answer» C. Three

Discussion

27.	A UJT is sometimes called ___________ diode.$?
A.	Low resistance
B.	High resistance
C.	Single-base
D.	Double-base
Answer» E.

Discussion

28.	Which of the following is not a characteristic of UJT?$?
A.	Intrinsic stand off ratio
B.	Negative resistance
C.	Peak-point voltage
D.	Bilateral conduction
Answer» E.

Discussion

29.	Power electronics essentially deals with control of a.c. power at ___________.$?
A.	Frequencies above 20 kHz
B.	Frequencies above 1000 kHz
C.	Frequencies less than 10 Hz
D.	50 Hz frequency
Answer» E.

Discussion

30.	In a UJT, the p-type emitter is ___________ doped$?
A.	Lightly
B.	Heavily
C.	Moderately
D.	None of the above
Answer» C. Moderately

Discussion

31.	Which of the following is not a characteristic of UJT??
A.	Intrinsic stand off ratio
B.	Negative resistance
C.	Peak-point voltage
D.	Bilateral conduction
Answer» E.

Discussion

32.	A UJT is sometimes called ___________ diode.?
A.	Low resistance
B.	High resistance
C.	Single-base
D.	Double-base
Answer» E.

Discussion

33.	In a UJT, the p-type emitter is ___________ doped?
A.	Lightly
B.	Heavily
C.	Moderately
D.	None of the above
Answer» C. Moderately

Discussion

34.	Power electronics essentially deals with control of a.c. power at ___________.?
A.	Frequencies above 20 kHz
B.	Frequencies above 1000 kHz
C.	Frequencies less than 10 Hz
D.	50 Hz frequency
Answer» E.

Discussion

35.	The UJT may be used as ___________.?
A.	Am amplifier
B.	A sawtooth generator
C.	A rectifier
D.	None of the above
Answer» C. A rectifier

Discussion

36.	The normal way to turn on a diac is by ___________.
A.	Gate current
B.	Gate voltage
C.	Breakover voltage
D.	None of the above
Answer» D. None of the above

Discussion

37.	To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.
A.	Less than
B.	Equal to
C.	More than
D.	None of the above
Answer» D. None of the above

Discussion

38.	When the temperature increases, the intrinsic stand off ratio ___________.
A.	Increases
B.	Decreases
C.	Essentially remains the same
D.	None of the above
Answer» D. None of the above

Discussion

39.	When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.
A.	Increases
B.	Decreases
C.	Remains the same
D.	None of the above
Answer» B. Decreases

Discussion

40.	A UJT has ___________.
A.	Two pn junctions
B.	One pn junction
C.	Three pn junctions
D.	None of the above
Answer» C. Three pn junctions

Discussion

Explore topic-wise MCQs in Electrical Engineering.

A triac is equivalent to two SCRs ___________.%!

The triac is ___________.%!

When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________%!

When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.%!

After peak point, the UJT operates in the ___________ region.%!

A triac has ___________ semiconductor layers.%!

A Triac has three terminals viz ___________%!

*$_After peak point, the UJT operates in the ___________ region.?

*$_When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.?

*$_A Triac has three terminals viz ___________?

*$_A triac has ___________ semiconductor layers.?

*$_A triac is a ___________ switch?

*/*_The device that exhibits negative resistance region is ___________.?

*/*_Between the peak point and the valley point of UJT emitter characteristics we have ___________ region?

*/*_A diac is simply ___________.?

*/*_The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant?

_ Between the peak point and the valley point of UJT emitter characteristics we have ___________ region$?

_ The device that exhibits negative resistance region is ___________.$?

_ The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant$?

_ A diac is simply ___________.$?

_ A diac has ___________ terminals.$?

_A triac can pass a portion of ___________ half-cycle through the load.$?

_A diac is turned on by ___________.$?

_The device that does not have the gate terminal is ___________.$?

_A diac is ___________ switch$?

_A diac has ___________ pn junctions$?

A UJT is sometimes called ___________ diode.$?

Which of the following is not a characteristic of UJT?$?

Power electronics essentially deals with control of a.c. power at ___________.$?

In a UJT, the p-type emitter is ___________ doped$?

Which of the following is not a characteristic of UJT??

A UJT is sometimes called ___________ diode.?

In a UJT, the p-type emitter is ___________ doped?

Power electronics essentially deals with control of a.c. power at ___________.?

The UJT may be used as ___________.?

The normal way to turn on a diac is by ___________.

To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

When the temperature increases, the intrinsic stand off ratio ___________.

When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

A UJT has ___________.

/_The device that exhibits negative resistance region is ___________.?

/_Between the peak point and the valley point of UJT emitter characteristics we have ___________ region?

/_A diac is simply ___________.?

/_The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant?