98 + Mcqs in Diodes And Applications Page 1 McqOptions

1.	A ___ is created when an electron moves from the valence band to the conduction band.
A.	hole
B.	gap
C.	vacancy
D.	blank
Answer» B. gap

Discussion

2.	The average value of the half-wave rectified output voltage is approximately __________ of V.
A.	31.8%
B.	63.6%
C.	70.7%
D.	100%
Answer» B. 63.6%

Discussion

3.	What is the percent of regulation if V = 20 V and V = 19.8 V?
A.	0%
B.	1%
C.	.1%
D.	5%
Answer» C. .1%

Discussion

4.	The voltage where current may start to flow in a reverse-biased junction is called the
A.	breakdown voltage
B.	barrier potential
C.	forward voltage
D.	biasing voltage
Answer» B. barrier potential

Discussion

5.	Atoms in a silicon crystal are held together by ___ bonds.
A.	crystal
B.	chemical
C.	electrical
D.	covalent
Answer» E.

Discussion

6.	___ occurs when a junction is first formed.
A.	Recombination
B.	Covalent bonding
C.	Crystallization
D.	Breakdown
Answer» B. Covalent bonding

Discussion

7.	a junction allows the flow of majority current.
A.	True
B.	False
Answer» C.

Discussion

8.	The is the small difference of potential created by positive and negative ions on either side of the depletion region.
A.	True
B.	False
Answer» B. False

Discussion

9.	is a small reverse current that flows in a photodiode that is receiving no light.
A.	True
B.	False
Answer» B. False

Discussion

10.	The area at the junction of -type and -type materials that has lost its is called the
A.	barrier potential
B.	depletion region
C.	region
D.	region
Answer» C. region

Discussion

11.	At any given time in an piece of semiconductor material at room temperature
A.	electrons drift randomly
B.	recombination occurs
C.	holes are created
D.	All of the above
Answer» E.

Discussion

12.	If a bridge rectifier is used, it is not necessary to use a transformer.
A.	1
B.
Answer» B.

Discussion

13.	Breakdown voltage and peak inverse voltage are the same.
A.	1
B.
Answer» B.

Discussion

14.	It is not possible to use a half-wave rectifier circuit without a transformer.
A.	1
B.
Answer» C.

Discussion

15.	An electron can move to another atom's orbit only while in the _______.
A.	valence band
B.	conduction band
C.	orbit nearest the nucleus
D.	covalent band
Answer» C. orbit nearest the nucleus

Discussion

16.	The peak inverse voltage (PIV) for the diode in the give circuit equals ___.
A.	3 V
B.	2.3 V
C.	0 V
D.	6 V
Answer» B. 2.3 V

Discussion

17.	Connecting a capacitor filter to the circuit in the given circuit will___.
A.	produce a nearly-constant dc voltage
B.	reduce the output voltage
C.	increase the ripple voltage
D.	lower the surge current
Answer» B. reduce the output voltage

Discussion

18.	The forward biased characteristics of a zener diode are the same as those of a diode.
A.	1
B.
Answer» B.

Discussion

19.	Doping semiconductive material is the process of putting a small amount of pentavalent or trivalent atoms in with tetravalent atoms.
A.	1
B.
Answer» B.

Discussion

20.	Atoms in a silicon crystal are held together by ___ bonds.
A.	crystal
B.	chemical
C.	electrical
D.	covalent
Answer» E.

Discussion

21.	The peak output voltage from the circuit in the given circuit equals ___.
A.	3 V
B.	3.7 V
C.	2.3 V
D.	0 V
Answer» D. 0 V

Discussion

22.	One of the advantages of using transformer coupling in a half-wave rectifier is that it allows the ac source to be directly connected to the load.
A.	1
B.
Answer» C.

Discussion

23.	The barrier potential is the small difference of potential created by positive and negative ions on either side of the depletion region.
A.	1
B.
Answer» B.

Discussion

24.	A zener diode has a larger breakdown voltage than a diode.
A.	1
B.
Answer» C.

Discussion

25.	Reverse biasing a pn junction allows the flow of majority current.
A.	1
B.
Answer» C.

Discussion

26.	Dark current is a small reverse current that flows in a photodiode that is receiving no light.
A.	1
B.
Answer» B.

Discussion

27.	A zener diode can be tested with an ohmmeter.
A.	1
B.
Answer» C.

Discussion

28.	A pure semiconductor material ___ very well.
A.	conducts
B.	insulates
C.	conducts and insulates
D.	neither conducts nor insulates
Answer» E.

Discussion

29.	Electrons in the conduction band are the only ones that are included in the electron current flow.
A.	1
B.
Answer» B.

Discussion

30.	The average value of the output voltage from the circuit in the given circuit equals ___.
A.	5.48 V
B.	2.74 V
C.	0 V
D.	6.37 V
Answer» B. 2.74 V

Discussion

31.	A diode can be tested with an ohmmeter.
A.	1
B.
Answer» B.

Discussion

32.	A zener diode can be used to provide voltage regulation in a power supply.
A.	1
B.
Answer» B.

Discussion

33.	A common problem with rectifiers is open diodes.
A.	1
B.
Answer» B.

Discussion

34.	___ occurs when a pn junction is first formed.
A.	Recombination
B.	Covalent bonding
C.	Crystallization
D.	Breakdown
Answer» B. Covalent bonding

Discussion

35.	The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately:
A.	half the peak secondary voltage
B.	twice the peak secondary voltage
C.	the peak value of the secondary voltage
D.	four times the peak value of the secondary voltage
Answer» D. four times the peak value of the secondary voltage

Discussion

36.	The diode's characteristic curve shows that current increases when voltage increases.
A.	1
B.
C.	1
D.
Answer» B.

Discussion

37.	The number of electrons in a stable atom is the same as the number of protons in its nucleus.
A.	1
B.
Answer» B.

Discussion

38.	The conduction band is closest to the valence band in
A.	semiconductors
B.	conductors
C.	insulators
D.	The distance is the same for all of the above.
Answer» B. conductors

Discussion

39.	Special diodes designed to conduct in the reverse direction are called _______________ diodes.
A.	zener
B.	varactor
C.	LED
D.	switching
Answer» B. varactor

Discussion

40.	A two-diode rectifier will not operate without a _________.
A.	center-tapped transformer
B.	voltage regulator
C.	capacitive filter
D.	phase-inverting transformer
Answer» B. voltage regulator

Discussion

41.	Rectifier output polarity depends upon:
A.	cycles of input
B.	capacitor polarity
C.	half or full wave
D.	diode installation
Answer» E.

Discussion

42.	DC power should be connected to forward bias a diode as follows:
A.	‚Äì anode, + cathode
B.	‚Äì cathode, ‚Äì anode
C.	+ anode, ‚Äì cathode
D.	+ cathode, + anode
Answer» D. + cathode, + anode

Discussion

43.	Shunting the ac component away from the load is the task of a:
A.	transformer
B.	filter
C.	regulator
D.	rectifier
Answer» C. regulator

Discussion

44.	What is the current through the zener diode?
A.	0 mA
B.	7 mA
C.	8.3 mA
D.	13 mA
Answer» C. 8.3 mA

Discussion

45.	The PIV rating of a diode in a full-wave bridge rectifier is more than that required for a full-wave center-tapped configuration.
A.	1
B.
Answer» C.

Discussion

46.	When checking a diode, low resistance readings both ways indicate the diode is:
A.	open
B.	satisfactory
C.	faulty
D.	not the problem
Answer» D. not the problem

Discussion

47.	The characteristic curve for the complex model of a silicon diode shows that
A.	the barrier potential is 0 V
B.	the barrier potential stays fixed at 0.7 V
C.	the barrier potential increases slightly with an increase in current
D.	the barrier potential decreases slightly with an increase in current
Answer» D. the barrier potential decreases slightly with an increase in current

Discussion

48.	What is the peak output voltage for this half-wave rectifier?
A.	1 V
B.	7.8 V
C.	10.9 V
D.	15.6 V
Answer» C. 10.9 V

Discussion

49.	Thermal shutdown occurs in an IC regulator if:
A.	power dissipation is too high
B.	internal temperature is too high
C.	current through the device is too high
D.	load resistance increases
Answer» C. current through the device is too high

Discussion

50.	An LED can be tested with an ohmmeter.
A.	1
B.
C.	1
D.
Answer» C. 1

Discussion

Explore topic-wise MCQs in Electronics.

A ___ is created when an electron moves from the valence band to the conduction band.

The average value of the half-wave rectified output voltage is approximately __________ of V.

What is the percent of regulation if V = 20 V and V = 19.8 V?

The voltage where current may start to flow in a reverse-biased junction is called the

Atoms in a silicon crystal are held together by ___ bonds.

___ occurs when a junction is first formed.

a junction allows the flow of majority current.

The is the small difference of potential created by positive and negative ions on either side of the depletion region.

is a small reverse current that flows in a photodiode that is receiving no light.

The area at the junction of -type and -type materials that has lost its is called the

At any given time in an piece of semiconductor material at room temperature

If a bridge rectifier is used, it is not necessary to use a transformer.

Breakdown voltage and peak inverse voltage are the same.

It is not possible to use a half-wave rectifier circuit without a transformer.

An electron can move to another atom's orbit only while in the _______.

The peak inverse voltage (PIV) for the diode in the give circuit equals ___.

Connecting a capacitor filter to the circuit in the given circuit will___.

The forward biased characteristics of a zener diode are the same as those of a diode.

Doping semiconductive material is the process of putting a small amount of pentavalent or trivalent atoms in with tetravalent atoms.

Atoms in a silicon crystal are held together by ___ bonds.

The peak output voltage from the circuit in the given circuit equals ___.

One of the advantages of using transformer coupling in a half-wave rectifier is that it allows the ac source to be directly connected to the load.

The barrier potential is the small difference of potential created by positive and negative ions on either side of the depletion region.

A zener diode has a larger breakdown voltage than a diode.

Reverse biasing a pn junction allows the flow of majority current.

Dark current is a small reverse current that flows in a photodiode that is receiving no light.

A zener diode can be tested with an ohmmeter.

A pure semiconductor material ___ very well.

Electrons in the conduction band are the only ones that are included in the electron current flow.

The average value of the output voltage from the circuit in the given circuit equals ___.

A diode can be tested with an ohmmeter.

A zener diode can be used to provide voltage regulation in a power supply.

A common problem with rectifiers is open diodes.

___ occurs when a pn junction is first formed.

The peak inverse voltage (PIV) across a nonconducting diode in a bridge rectifier equals approximately:

The diode's characteristic curve shows that current increases when voltage increases.

The number of electrons in a stable atom is the same as the number of protons in its nucleus.

The conduction band is closest to the valence band in

Special diodes designed to conduct in the reverse direction are called _______________ diodes.

A two-diode rectifier will not operate without a _________.

Rectifier output polarity depends upon:

DC power should be connected to forward bias a diode as follows:

Shunting the ac component away from the load is the task of a:

What is the current through the zener diode?

The PIV rating of a diode in a full-wave bridge rectifier is more than that required for a full-wave center-tapped configuration.

When checking a diode, low resistance readings both ways indicate the diode is:

The characteristic curve for the complex model of a silicon diode shows that

What is the peak output voltage for this half-wave rectifier?

Thermal shutdown occurs in an IC regulator if:

An LED can be tested with an ohmmeter.