104 + Mcqs in Diode Applications Page 1 McqOptions

1.	The quiescent point (Q-point) is defined by a(n) ________.
A.	ac network
B.	dc network
C.	ac and dc network
D.	None of the above
Answer» C. ac and dc network

Discussion

2.	The load line is defined by the ________ and a characteristic curve is defined by the ________.
A.	quiescent point, device
B.	device, network
C.	network, device
D.	None of the above
Answer» D. None of the above

Discussion

3.	The intersection of the load line with the characteristic curve determines the ________ of the system.
A.	point of operation
B.	load-line analysis
C.	characteristic curve
D.	forward bias
Answer» B. load-line analysis

Discussion

4.	The slope of the load line depends on the ________.
A.	type of the diode used
B.	characteristic curve
C.	load resistor
D.	source voltage
Answer» D. source voltage

Discussion

5.	What is the voltage measured from the negative terminal of C4 to the negative terminal of the transformer?
A.	–10 V
B.	–20 V
C.	10 V
D.	20 V
Answer» C. 10 V

Discussion

6.	In a voltage regulator network with fixed RL and R, what element dictates the minimum level of source voltage?
A.	VZ
B.	IZ
C.	IZM
D.	None of the above
Answer» B. IZ

Discussion

7.	With this Zener diode in its "on state," what is the level of IZ for the maximum load resistance?
A.	0 mA
B.	Undefined
C.	Equal to IRL
D.	IZM
Answer» E.

Discussion

8.	Calculate IL and IZ.
A.	2 mA, 0 mA
B.	4 mA, 2 mA
C.	2 mA, 2 mA
D.	2 mA, 4 mA
Answer» E.

Discussion

9.	Determine the total discharge time for the capacitor in a clamper having C = 0.01 F and R = 500 k.
A.	5 ms
B.	25 ms
C.	2.5 ms
D.	50 ms
Answer» C. 2.5 ms

Discussion

10.	Determine Vo if E1 = E2 = 10 V.
A.	9.3 V
B.	10 V
C.	–10 V
D.	0 V
Answer» C. –10 V

Discussion

11.	Determine ID1.
A.	0 mA
B.	29.40 mA
C.	14.70 mA
D.	14.09 mA
Answer» B. 29.40 mA

Discussion

12.	Determine the current through each diode if E1 = E2 = 0 V.
A.	4.65 mA
B.	9.3 mA
C.	18.6 mA
D.	0.7 mA
Answer» B. 9.3 mA

Discussion

13.	Determine ID2.
A.	29.40 mA
B.	30.30 mA
C.	14.70 mA
D.	None of the above
Answer» D. None of the above

Discussion

14.	Determine V2.
A.	3.201 V
B.	0 V
C.	4.3 V
D.	1.371 V
Answer» E.

Discussion

15.	A diode is in the "________" state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol, and VD ≥ 0.7 V for Si and VD ≥ 0.3 V for Ge.
A.	off
B.	on
C.	neutral
D.	quiescent
Answer» C. neutral

Discussion

16.	Determine ID.
A.	0 mA
B.	1.893 mA
C.	2.036 mA
D.	2.143 mA
Answer» C. 2.036 mA

Discussion

17.	Determine the current level if E = 15 V and R = 3 k.
A.	0 A
B.	4.76 mA
C.	5 mA
D.	5 A
Answer» C. 5 mA

Discussion

18.	Use the information provided here to determine the value of IDQ.
A.	0 mA
B.	4.3 mA
C.	5 mA
D.	10 mA
Answer» C. 5 mA

Discussion

19.	In a particular problem, which mode has the highest level of IDQ?
A.	Ideal
B.	Approximate equivalent
C.	Exact mode using characteristic curve
D.	None of the above
Answer» B. Approximate equivalent

Discussion

20.	In this voltage multiplier, measuring from the top of the transformer winding will provide ________ multiples of Vm at the output, whereas measuring the output voltage from the bottom of the transformer will provide ________ multiples of the peak Vm.
A.	odd, even
B.	even, odd
C.	odd, odd
D.	even, even
Answer» B. even, odd

Discussion

21.	The full-wave voltage doubler provides ________ filtering action than (as) the half-wave voltage doubler.
A.	better
B.	poorer
C.	the same
D.	None of the above
Answer» B. poorer

Discussion

22.	A Zener diode is in a ________ impedance region in the forward bias while it has a ________ impedance region in the reverse bias.
A.	very large, low
B.	very large, very large
C.	low, low
D.	low, very large
Answer» E.

Discussion

23.	In a half-wave voltage doubler, the voltage across output capacitor C2 drops across the load during the ________ half cycle and the capacitor is recharged up to ________ during the ________ half cycle.
A.	negative, 2Vm, positive
B.	positive, Vm, negative
C.	positive, 2Vm, negative
D.	negative, Vm, positive
Answer» D. negative, Vm, positive

Discussion

24.	With the Zener diode in the "on" state, increasing IL will ________ IZ and ________IR.
A.	decrease, increase
B.	increase, decrease
C.	decrease, keep the same level of
D.	increase, keep the same level of
Answer» D. increase, keep the same level of

Discussion

25.	Zener diodes are used in regulator networks to ________.
A.	generate voltage
B.	consume power
C.	maintain a fixed voltage across the load resistor
D.	protect the load
Answer» D. protect the load

Discussion

26.	For the "off" state of a Zener diode, the voltage across the diode should be ________.
A.	greater than VZ
B.	zero
C.	less than VZ but greater than zero
D.	None of the above
Answer» D. None of the above

Discussion

27.	Once the Zener diode is in the "on" state, VZ is always ________ VL.
A.	larger than
B.	smaller than
C.	the same as
D.	None of the above
Answer» D. None of the above

Discussion

28.	In a diode clamper, the capacitor retains a charge approximately equal to the peak value of the input.
A.	True
B.	False
Answer» B. False

Discussion

29.	The ratio of the total swing of the output of a clamper to its input total swing is ________.
A.	1
B.	2
C.	0.5
D.	0
Answer» B. 2

Discussion

30.	VRRM is the same as PIV rating.
A.	True
B.	False
Answer» B. False

Discussion

31.	A clamping network must have ________.
A.	a capacitor
B.	a diode
C.	a resistive element
D.	All of the above
Answer» E.

Discussion

32.	For greatest reliability, and longest life, diodes should be operated at their maximum ratings.
A.	True
B.	False
Answer» C.

Discussion

33.	For a given input frequency, a half-wave rectifier is easier to filter than a full-wave rectifier.
A.	True
B.	False
Answer» C.

Discussion

34.	Voltage multipliers take a dc input voltage, and provide a dc output voltage at a multiple of the input.
A.	True
B.	False
Answer» C.

Discussion

35.	Diode limiters add a dc level to an ac signal.
A.	True
B.	False
Answer» C.

Discussion

36.	Ripple voltage is caused by the charging and discharging of the filter capacitor.
A.	True
B.	False
Answer» B. False

Discussion

37.	The output voltage of a center-tapped full-wave rectifier equals the secondary output voltage.
A.	True
B.	False
Answer» C.

Discussion

38.	A single diode in a half-wave rectifier conducts for 180° of the input cycle.
A.	True
B.	False
Answer» B. False

Discussion

39.	A diode conducts current when reverse-biased and blocks current when forward-biased.
A.	True
B.	False
Answer» C.

Discussion

40.	What is the VRRM (PIV rating) for the 1N4001 rectifier diode?
A.	50 V
B.	100 V
C.	200 V
D.	400 V
E.	none of the above
Answer» B. 100 V

Discussion

41.	For the ideal diode the transition between states will occur at the point on the characteristic curve when VD = ________ V and ID = ________ A.
A.	0.3, 0
B.	0, 0
C.	0.7, 0
D.	0.7, 0.3
Answer» C. 0.7, 0

Discussion

42.	What is the PIV for each diode in a full-wave center-tapped rectifier? Note: Vp(out) = peak output voltage.
A.	Vp(out) – 0.7 V
B.	Vp(out) + 0.7 V
C.	2Vp(out) – 0.7 V
D.	2Vp(out) + 0.7 V
Answer» E.

Discussion

43.	A silicon diode has a voltage to ground of –117 V from the anode. The voltage to ground from the cathode is –117.7 V. The diode is
A.	open.
B.	shorted.
C.	forward-biased.
D.	reverse-biased.
Answer» D. reverse-biased.

Discussion

44.	Refer to the figure given below. Which diode arrangement will supply a negative output voltage?
A.	a
B.	b
C.	c
D.	d
Answer» D. d

Discussion

45.	The PIV rating of the diodes in a full-wave rectifier must be larger than ________ Vm.
A.	0.318
B.	0.636
C.	2
D.	1
Answer» E.

Discussion

46.	The dc voltage level of a silicon diode is ________ its ideal model.
A.	smaller than
B.	larger than
C.	the same as
D.	None of the above
Answer» C. the same as

Discussion

47.	Refer to the figure given below. If the voltmeter across the transformer reads 0 V, the probable trouble, if any, would be
A.	one of the diodes is open.
B.	a diode is shorted.
C.	an open transformer secondary.
D.	the filter capacitor is shorted.
E.	no trouble exists.
Answer» D. the filter capacitor is shorted.

Discussion

48.	Refer to the figure given below. The probable trouble, if any, indicated by these voltages is
A.	one of the diodes is open.
B.	a diode is shorted.
C.	an open transformer secondary.
D.	the filter capacitor is shorted.
E.	no trouble exists.
Answer» E. no trouble exists.

Discussion

49.	The process of removing one-half the input signal to establish a dc level is called ________.
A.	rectifier
B.	full-wave rectifier
C.	half-wave rectifier
D.	filtering
Answer» D. filtering

Discussion

50.	The absence of the Si or Ge and VD label on a diode denotes ________ notation.
A.	approximate model
B.	ideal model
C.	exact model
D.	None of the above
Answer» C. exact model

Discussion

Explore topic-wise MCQs in Active Filter Circuits.

The quiescent point (Q-point) is defined by a(n) ________.

The load line is defined by the ________ and a characteristic curve is defined by the ________.

The intersection of the load line with the characteristic curve determines the ________ of the system.

The slope of the load line depends on the ________.

What is the voltage measured from the negative terminal of C4 to the negative terminal of the transformer?

In a voltage regulator network with fixed RL and R, what element dictates the minimum level of source voltage?

With this Zener diode in its "on state," what is the level of IZ for the maximum load resistance?

Calculate IL and IZ.

Determine the total discharge time for the capacitor in a clamper having C = 0.01 F and R = 500 k.

Determine Vo if E1 = E2 = 10 V.

Determine ID1.

Determine the current through each diode if E1 = E2 = 0 V.

Determine ID2.

Determine V2.

A diode is in the "________" state if the current established by the applied sources is such that its direction matches that of the arrow in the diode symbol, and VD ≥ 0.7 V for Si and VD ≥ 0.3 V for Ge.

Determine ID.

Determine the current level if E = 15 V and R = 3 k.

Use the information provided here to determine the value of IDQ.

In a particular problem, which mode has the highest level of IDQ?

In this voltage multiplier, measuring from the top of the transformer winding will provide ________ multiples of Vm at the output, whereas measuring the output voltage from the bottom of the transformer will provide ________ multiples of the peak Vm.

The full-wave voltage doubler provides ________ filtering action than (as) the half-wave voltage doubler.

A Zener diode is in a ________ impedance region in the forward bias while it has a ________ impedance region in the reverse bias.

In a half-wave voltage doubler, the voltage across output capacitor C2 drops across the load during the ________ half cycle and the capacitor is recharged up to ________ during the ________ half cycle.

With the Zener diode in the "on" state, increasing IL will ________ IZ and ________IR.

Zener diodes are used in regulator networks to ________.

For the "off" state of a Zener diode, the voltage across the diode should be ________.

Once the Zener diode is in the "on" state, VZ is always ________ VL.

In a diode clamper, the capacitor retains a charge approximately equal to the peak value of the input.

The ratio of the total swing of the output of a clamper to its input total swing is ________.

VRRM is the same as PIV rating.

A clamping network must have ________.

For greatest reliability, and longest life, diodes should be operated at their maximum ratings.

For a given input frequency, a half-wave rectifier is easier to filter than a full-wave rectifier.

Voltage multipliers take a dc input voltage, and provide a dc output voltage at a multiple of the input.

Diode limiters add a dc level to an ac signal.

Ripple voltage is caused by the charging and discharging of the filter capacitor.

The output voltage of a center-tapped full-wave rectifier equals the secondary output voltage.

A single diode in a half-wave rectifier conducts for 180° of the input cycle.

A diode conducts current when reverse-biased and blocks current when forward-biased.

What is the VRRM (PIV rating) for the 1N4001 rectifier diode?

For the ideal diode the transition between states will occur at the point on the characteristic curve when VD = ________ V and ID = ________ A.

What is the PIV for each diode in a full-wave center-tapped rectifier? Note: Vp(out) = peak output voltage.

A silicon diode has a voltage to ground of –117 V from the anode. The voltage to ground from the cathode is –117.7 V. The diode is

Refer to the figure given below. Which diode arrangement will supply a negative output voltage?

The PIV rating of the diodes in a full-wave rectifier must be larger than ________ Vm.

The dc voltage level of a silicon diode is ________ its ideal model.

Refer to the figure given below. If the voltmeter across the transformer reads 0 V, the probable trouble, if any, would be

Refer to the figure given below. The probable trouble, if any, indicated by these voltages is

The process of removing one-half the input signal to establish a dc level is called ________.

The absence of the Si or Ge and VD label on a diode denotes ________ notation.

The load line is defined by the and a characteristic curve is defined by the .

In this voltage multiplier, measuring from the top of the transformer winding will provide multiples of Vm at the output, whereas measuring the output voltage from the bottom of the transformer will provide multiples of the peak Vm.

A Zener diode is in a impedance region in the forward bias while it has a impedance region in the reverse bias.

In a half-wave voltage doubler, the voltage across output capacitor C2 drops across the load during the half cycle and the capacitor is recharged up to during the half cycle.

With the Zener diode in the "on" state, increasing IL will IZ and IR.

For the ideal diode the transition between states will occur at the point on the characteristic curve when VD = V and ID = A.