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Worksheets

MALVINO 2

Total questions: 151

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

The barrier potential across each silicon depletion layer is

a)

0

b)

0.3 V

c)

0.7 V

d)

1 V

2.

The emitter diode is usually

a)

Forward-biased

b)

Reverse-biased

c)

Nonconducting

d)

Operating in the breakdown region

3.

For normal operation of the transistor, the collector diode has to be

a)

Forward-biased

b)

Reverse-biased

c)

Nonconducting

d)

Operating in the breakdown region

4.

The base of an npn transistor is thin and

a)

Heavily doped

b)

Lightly doped

c)

Metallic

d)

Doped by a pentavalent material

5.

Most of the electrons in the base of an npn transistor flow

a)

Out of the base lead

b)

Into the collector

c)

Into the emitter

d)

Into the base supply

6.

Most of the electrons in the base of an npn transistor do not recombine because they

a)

Have a long lifetime

b)

Have a negative charge

c)

Must flow a long way through the base

d)

Flow out of the base

7.

Most of the electrons that flow through the base will

a)

Flow into the collector

b)

Flow out of the base lead

c)

Recombine with base holes

d)

Recombine with collector holes

8.

The current gain of a transistor is the ratio of the

a)

Collector current to emitter current

b)

Collector current to base current

c)

Base current to collector current

d)

Emitter current to collector current

9.

Increasing the collector supply voltage will increase

a)

Base current

b)

Collector current

c)

Emitter current

d)

None of the above

10.

The fact that only a few holes are in the base region means the base is

a)

Lightly doped

b)

Heavily doped

c)

Undoped

d)

None of the above

11.

In a normally biased npn transistor, the electrons in the emitter have enough energy to overcome the barrier potential of the

a)

Base-emitter junction

b)

Base-collector junction

c)

Collector-base junction

d)

Recombination path

12.

When a free electron recombines with a hole in the base region, the free electron becomes

a)

Another free electron

b)

A valence electron

c)

A conduction-band electron

d)

A majority carrier

13.

What is the most important fact about the collector current?

a)

It is measured in milliamperes.

b)

It equals the base current divided by the current gain.

c)

It is small.

d)

It approximately equals the emitter current.

14.

If the current gain is 200 and the collector current is 100 mA, the base current is

a)

0.5 mA

b)

2 mA

c)

2 A

d)

20 A

15.

The base-emitter voltage is usually

a)

Less than the base supply voltage

b)

Equal to the base supply voltage

c)

More than the base supply voltage

d)

Cannot answer

16.

The collector-emitter voltage is usually

a)

Less than the collector supply voltage

b)

Equal to the collector supply voltage

c)

More than the collector supply voltage

d)

Cannot answer

17.

The power dissipated by a transistor approximately equals the collector current times

a)

Base-emitter voltage

b)

Collector-emitter voltage

c)

Base supply voltage

d)

0.7 V

18.

A small collector current with zero base current is caused by the leakage current of the

a)

Emitter diode

b)

Collector diode

c)

Base diode

d)

Transistor

19.

A transistor acts like a diode and a

a)

Voltage source

b)

Current source

c)

Resistance

d)

Power supply

20.

If the base current is 100 mA and the current gain is 30, the collector current is

a)

300 mA

b)

3 A

c)

3.33 A

d)

10 A

21.

The base-emitter voltage of an ideal transistor is

a)

0

b)

0.3 V

c)

0.7 V

d)

1 V

22.

If you recalculate the collector-emitter voltage with the second approximation, the answer will usually be

a)

Smaller than the ideal value

b)

The same as the ideal value

c)

Larger than the ideal value

d)

Inaccurate

23.

In the active region, the collector current is not changed significantly by

a)

Base supply voltage

b)

Base current

c)

Current gain

d)

Collector resistance

24.

The base-emitter voltage of the second approximation is

a)

0

b)

0.3 V

c)

0.7 V

d)

1 V

25.

If the base resistor is open, what is the collector current?

a)

0

b)

1 mA

c)

2 mA

d)

10 mA

26.

The current gain of a transistor is defined as the ratio of the collector current to the

a)

Base current

b)

Emitter current

c)

Supply current

d)

Collector current

27.

The graph of current gain versus collector-current indicates that the current gain

a)

Is constant

b)

Varies slightly

c)

Varies significantly

d)

Equals the collector current divided by the base current

28.

When the collector current increases, what does the current gain do?

a)

Decreases

b)

Stays the same

c)

Increases

d)

Any of the above

29.

As the temperature increases, the current gain

a)

Decreases

b)

Remains the same

c)

Increases

d)

Can be any of the above

30.

When the base resistor decreases, the collector voltage will probably

a)

Decrease

b)

Stay the same

c)

Increase

d)

Do all of the above

31.

If the base resistor is very small, the transistor will operate in the

a)

Cutoff region

b)

Active region

c)

Saturation region

d)

Breakdown region

32.

Ignoring the bulk resistance of the collector diode, the collector-emitter saturation voltage is

a)

0

b)

A few tenths of a volt

c)

1 V

d)

Supply voltage

33.

Three different Q points are shown on a load line. The upper Q point represents the

a)

Minimum current gain

b)

Intermediate current gain

c)

Maximum current gain

d)

Cutoff point

34.

If a transistor operates at the middle of the load line, an increase in the base resistance will move the Q point

a)

Down

b)

Up

c)

Nowhere

d)

Off the load line

35.

If a transistor operates at the middle of the load line, an increase in the current gain will move the Q point

a)

Down

b)

Up

c)

Nowhere

d)

Off the load line

36.

If the base supply voltage increases, the Q point moves

a)

Down

b)

Up

c)

Nowhere

d)

Off the load line

37.

Suppose the base resistor is open. The Q point will be

a)

In the middle of the load line

b)

At the upper end of the load line

c)

At the lower end of the load line

d)

Off the load line

38.

If the base supply voltage is disconnected, the collector-emitter voltage will equal

a)

0 V

b)

6 V

c)

10.5 V

d)

Collector supply voltage

39.

If the base resistor is shorted, the transistor will probably be

a)

Saturated

b)

In cutoff

c)

Destroyed

d)

None of the above

40.

If the collector resistor decreases to zero in a base-biased circuit, the load line will become

a)

Horizontal

b)

Vertical

c)

Useless

d)

Flat

41.

The collector current is 10 mA. If the current gain is 100, the base current is

a)

1 microamp

b)

10 microamp

c)

100 microamp

d)

1 mA

42.

The base current is 50 microamp. If the current gain is 125, the collector current is closest in value to

a)

40 microamp

b)

500 microamp

c)

1 mA

d)

6 mA

43.

When the Q point moves along the load line, the voltage increases when the collector current

a)

Decreases

b)

Stays the same

c)

Increases

d)

Does none of the above

44.

When there is no base current in a transistor switch, the output voltage from the transistor is

a)

Low

b)

High

c)

Unchanged

d)

Unknown

45.

A circuit with a fixed emitter current is called

a)

Base bias

b)

Emitter bias

c)

Transistor bias

d)

Two-supply bias

46.

The first step in analyzing emitter-based circuits is to find the

a)

Base current

b)

Emitter voltage

c)

Emitter current

d)

Collector current

47.

If the current gain is unknown in an emitter-biased circuit, you cannot calculate the

a)

Emitter voltage

b)

Emitter current

c)

Collector current

d)

Base current

48.

If the emitter resistor is open, the collector voltage is

a)

Low

b)

High

c)

Unchanged

d)

Unknown

49.

If the collector resistor is open, the collector voltage is

a)

Low

b)

High

c)

Unchanged

d)

Unknown

50.

When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current

a)

Remains almost the same

b)

Decreases by a factor of 6

c)

Increases by a factor of 6

d)

Is zero

51.

If the emitter resistance decreases, the collector voltage

a)

Decreases

b)

Stays the same

c)

Increases

d)

Breaks down the transistor

52.

If the emitter resistance decreases, the

a)

Q point moves up

b)

Collector current decreases

c)

Q point stays where it is

d)

Current gain increases

53.

the emitter resistance decreases, the

a)

Q point moves up

b)

Collector current decreases

c)

Q point stays where it is

d)

Current gain increases

54.

For emitter bias, the voltage across the emitter resistor is the same as the voltage between the emitter and the

a)

Base

b)

Collector

c)

Emitter

d)

Ground

55.

For emitter bias, the voltage at the emitter is 0.7 V less than the

a)

Base voltage

b)

Emitter voltage

c)

Collector voltage

d)

Ground voltage

56.

With voltage-divider bias, the base voltage is

a)

Less than the base supply voltage

b)

Equal to the base supply voltage

c)

Greater than the base supply voltage

d)

Greater than the collector supply voltage

57.

VDB is noted for its

a)

Unstable collector voltage

b)

Varying emitter current

c)

Large base current

d)

Stable Q point

58.

With VDB, an increase in emitter resistance will

a)

Decrease the emitter voltage

b)

Decrease the collector voltage

c)

Increase the emitter voltage

d)

Decrease the emitter current

59.

VDB has a stable Q point like

a)

Base bias

b)

Emitter bias

c)

Collector-feedback bias

d)

Emitter-feedback bias

60.

VDB needs

a)

Only three resistors

b)

Only one supply

c)

Precision resistors

d)

More resistors to work better

61.

VDB normally operates in the

a)

Active region

b)

Cutoff region

c)

Saturation region

d)

Breakdown region

62.

The collector voltage of a VDB circuit is not sensitive to changes in the

a)

Supply voltage

b)

Emitter resistance

c)

Current gain

d)

Collector resistance

63.

If the emitter resistance increases in a VDB circuit, the collector voltage

a)

Decreases

b)

Stays the same

c)

Increases

d)

Doubles

64.

Base bias is associated with

a)

Amplifiers

b)

Switching circuits

c)

Stable Q point

d)

Fixed emitter current

65.

If the emitter resistance doubles in a VDB circuit, the collector current will

a)

Double

b)

Drop in half

c)

Remain the same

d)

Increase

66.

If the collector resistance increases in a VDB circuit, the collector voltage will

a)

Decrease

b)

Stay the same

c)

Increase

d)

Double

67.

The Q point of a VDB circuit is

a)

Hypersensitive to changes in current gain

b)

Somewhat sensitive to changes in current gain

c)

Almost totally insensitive to changes in current gain

68.

The base voltage of two-supply emitter bias (TSEB) is

a)

0.7 V

b)

Very large

c)

Near 0 V

d)

1.3 V

69.

If the emitter resistance doubles with TSEB, the collector current will

a)

Drop in half

b)

Stay the same

c)

Double

d)

Increase

70.

If a splash of solder shorts the collector resistor of TSEB, the collector voltage will

a)

Drop to zero

b)

Equal the collector supply voltage

c)

Stay the same

d)

Double

71.

If the emitter resistance increases with TSEB, the collector voltage will

a)

Decrease

b)

Stay the same

c)

Increase

d)

Equal the collector supply voltage

72.

If the emitter resistor opens with TSEB, the collector voltage will

a)

Decrease

b)

Stay the same

c)

Increase slightly

d)

Equal the collector supply voltage

73.

In TSEB, the base current must be very

a)

Small

b)

Large

c)

Unstable

d)

Stable

74.

The Q point of TSEB does not depend on the

a)

Emitter resistance

b)

Collector resistance

c)

Current gain

d)

Emitter voltage

75.

The majority carriers in the emitter of a pnp transistor are

a)

Holes

b)

Free electrons

c)

Trivalent atoms

d)

Pentavalent atoms

76.

The current gain of a pnp transistor is

a)

The negative of the npn current gain

b)

The collector current divided by the emitter current

c)

Near zero

d)

The ratio of collector current to base current

77.

Which is the largest current in a pnp transistor?

a)

Base current

b)

Emitter current

c)

Collector current

d)

None of these

78.

The currents of a pnp transistor are

a)

Usually smaller than npn currents

b)

Opposite npn currents

c)

Usually larger than npn currents

d)

Negative

79.

With pnp voltage-divider bias, you must use

a)

Negative power supplies

b)

Positive power supplies

c)

Resistors

d)

Grounds

80.

For dc, the current in a coupling circuit is

a)

Zero

b)

Maximum

c)

Minimum

d)

Average

81.

The current in a coupling circuit for high frequencies is

a)

Zero

b)

Maximum

c)

Minimum

d)

Average

82.

A coupling capacitor is

a)

A dc short

b)

An ac open

c)

A dc open and an ac short

d)

A dc short and an ac open

83.

In a bypass circuit, the top of a capacitor is

a)

An open

b)

A short

c)

An ac ground

d)

A mechanical ground

84.

The capacitor that produces an ac ground is called a

a)

Bypass capacitor

b)

Coupling capacitor

c)

Dc open

d)

Ac open

85.

The capacitors of a CE amplifier appear

a)

Open to ac

b)

Shorted to dc

c)

Open to supply voltage

d)

Shorted to ac

86.

Reducing all dc sources to zero is one of the steps in getting the

a)

DC equivalent circuit

b)

AC equivalent circuit

c)

Complete amplifier circuit

d)

Voltage-divider biased circuit

87.

The ac equivalent circuit is derived from the original circuit by shorting all

a)

Resistors

b)

Capacitors

c)

Inductors

d)

Transistors

88.

When the ac base voltage is too large, the ac emitter current is

a)

Sinusoidal

b)

Constant

c)

Distorted

d)

Alternating

89.

In a CE amplifier with a large input signal, the positive half cycle of the ac emitter current is

a)

Equal to the negative half cycle

b)

Smaller than the negative half cycle

c)

Larger than the negative half cycle

d)

Equal to the negative half cycle

90.

Ac emitter resistance equals 25 mV divided by the

a)

Quiescent base current

b)

DC emitter current

c)

AC emitter current

d)

Change in collector current

91.

To reduce the distortion in a CE amplifier, reduce the

a)

DC emitter current

b)

Base-emitter voltage

c)

Collector current

d)

AC base voltage

92.

If the ac voltage across the emitter diode is 1 mV and the ac emitter current is 0.1 mA, the ac resistance of the emitter diode is

a)

1 ohm

b)

10 ohm

c)

100 ohm

d)

1 kohm

93.

A graph of ac emitter current versus ac base-emitter voltage applies to the

a)

Transistor

b)

Emitter diode

c)

Collector diode

d)

Power supply

94.

The output voltage of a CE amplifier is

a)

Amplified

b)

Inverted

c)

180 degrees out of phase with the input

d)

All of the above

95.

The emitter of a CE amplifier has no ac voltage because of the

a)

DC voltage on it

b)

Bypass capacitor

c)

Coupling capacitor

d)

Load resistor

96.

The voltage across the load resistor of a CE amplifier is

a)

Dc and ac

b)

DC only

c)

AC only

d)

Neither dc nor ac

97.

The ac collector current is approximately equal to the

a)

AC base current

b)

AC emitter current

c)

AC source current

d)

AC bypass current

98.

The ac emitter current times the ac emitter resistance equals the

a)

Dc emitter voltage

b)

AC base voltage

c)

AC collector voltage

d)

Supply voltage

99.

The ac collector current equals the ac base current times the

a)

AC collector resistance

b)

DC current gain

c)

AC current gain

d)

Generator voltage

100.

The emitter is at ac ground in a

a)

CB stage

b)

CC stage

c)

CE stage

d)

None of these

101.

The output voltage of a CE stage is usually

a)

Constant

b)

Dependent on re'

c)

Small

d)

Less the one

102.

The voltage gain equals the output voltage divided by the

a)

Input voltage

b)

AC emitter resistance

c)

AC collector resistance

d)

Generator voltage

103.

The input impedance of the base increases when

a)

Beta increases

b)

Supply voltage increases

c)

Beta decreases

d)

AC collector resistance increases

104.

The emitter of a swamped amplifier

a)

Is grounded

b)

Has no de voltage

c)

Has an ac voltage

d)

Has no ac voltage

105.

A swamped amplifier uses

a)

Base bias

b)

Positive feedback

c)

Negative feedback

d)

A grounded emitter

106.

In a swamped amplifier, the effects of the emitter diode become

a)

Important to voltage gain

b)

Critical to input impedance

c)

Significant to the analysis

d)

Unimportant

107.

The feedback resistor

a)

Increases voltage gain

b)

Reduces distortion

c)

Decreases collector resistance

d)

Decreases input impedance

108.

The feedback resistor

a)

Stabilizes voltage gain

b)

Increases distortion

c)

Increases collector resistance

d)

Decreases input impedance

109.

The ac collector resistance of the first stage includes the

a)

Load resistance

b)

Input impedance of first stage

c)

Emitter resistance of first stage

d)

Input impedance of second stage

110.

If the emitter bypass capacitor opens, the ac output voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

111.

If the collector resistor is shorted, the ac output voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

112.

If the load resistance is open, the ac output voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

113.

If any capacitor is open, the ac output voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

114.

If the input coupling capacitor is open, the ac input voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

115.

If the bypass capacitor is open, the ac input voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

116.

If the output coupling capacitor is open, the ac input voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

117.

If the emitter resistor is open, the ac input voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

118.

If the collector resistor is open, the ac input voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal approximately zero

119.

If the emitter bypass capacitor is shorted, the ac input voltage will

a)

Decrease

b)

Increase

c)

Remain the same

d)

Equal zero

120.

An emitter follower has a voltage gain that is

a)

Much less than one

b)

Approximately equal to one

c)

Greater than one

d)

Zero

121.

The total ac emitter resistance of an emitter follower equals

a)

re'

b)

re

c)

re + re'

d)

RE

122.

The input impedance of the base of an emitter follower is usually

a)

Low

b)

High

c)

Shorted to ground

d)

Open

123.

The dc emitter current for class A emitter followers is

a)

The same as the ac emitter current

b)

VE divided by RE

c)

Vc divided by Rc

d)

The same as the load current

124.

The ac base voltage of an emitter follower is across the

a)

Emitter diode

b)

DC emitter resistor

c)

Load resistor

d)

Emitter diode and external ac emitter resistance

125.

The output voltage of an emitter follower is across the

a)

Emitter diode

b)

DC collector resistor

c)

Load resistor

d)

Emitter diode and external ac emitter resistance

126.

If Beta = 200 and re = 150 ohm, the input impedance of the base is approximately

a)

30 kohm

b)

600 n

c)

3 kohm

d)

5 kohm

127.

The input voltage to an emitter follower is usually

a)

Less than the generator voltage

b)

Equal to the generator voltage

c)

Greater than the generator voltage

d)

Equal to the supply voltage

128.

The ac emitter current is closest to

a)

VG divided by re

b)

vin divided by re'

c)

VG divided by re'

d)

vin divided by re

129.

The output voltage of an emitter follower is approximately

a)

0

b)

VG

c)

vin

d)

Vcc

130.

The ac load line of an emitter follower is usually

a)

The same as the dc load line

b)

More horizontal than the dc load line

c)

Steeper than the dc load line

d)

Vertical

131.

If the input voltage to an emitter follower is too large, the output voltage will be

a)

Smaller

b)

Larger

c)

Equal

d)

Clipped

132.

If the Q point is at the middle of the dc load line, clipping will first occur on the

a)

Left voltage swing

b)

Upward current swing

c)

Positive half cycle of input

d)

Negative half cycle of input

133.

If an emitter follower has VCEQ = 5 V, ICQ = 1 mA, and re = 1 kohm, the maximum peak-to-peak unclipped output is

a)

1 V

b)

2 V

c)

5 V

d)

10 V

134.

If the load resistance of an emitter follower is very large, the external ac emitter resistance equals

a)

Generator resistance

b)

Impedance of the base

c)

DC emitter resistance

d)

DC collector resistance

135.

If an emitter follower has re' = 10 ohm and re = 90 ohm, the voltage gain is approximately

a)

0

b)

0.5

c)

0.9

d)

1

136.

A square wave out of an emitter follower implies

a)

No clipping

b)

Clipping at saturation

c)

Clipping at cutoff

d)

Clipping on both peaks

137.

A Darlington transistor has

a)

A very low input impedance

b)

Three transistors

c)

A very high current gain

d)

One VBE drop

138.

The ac load line of the emitter follower is

a)

The same as the dc load line

b)

Different from the dc load line

c)

Horizontal

d)

Vertical

139.

If the generator voltage is 5 mV in an emitter follower, the output voltage across the load is closest to

a)

5 mV

b)

150 mV

c)

0.25 V

d)

0.5 V

140.

If R1 is open in an emitter follower, which of these is true?

a)

DC base voltage is Vcc

b)

DC collector voltage is zero

c)

Output voltage is normal

d)

DC base voltage is zero

141.

Usually, the distortion in an emitter follower is

a)

Very low

b)

Very high

c)

Large

d)

Not acceptable

142.

The distortion in an emitter follower is

a)

Seldom low

b)

Often high

c)

Always low

d)

High when clipping occurs

143.

If a CE stage is direct coupled to an emitter follower, how many coupling capacitors are there between the two stages?

a)

0

b)

1

c)

2

d)

3

144.

A Darlington transistor has a Beta of 8000. If RE = 1 kohm and RL = 100 ohm, the input impedance of the base is closest to

a)

8 kohm

b)

80 kohm

c)

800 kohm

d)

8 Mohm

145.

The transistors of a class B push-pull emitter follower are biased at or near

a)

Cutoff

b)

The center of the dc load line

c)

Saturation

d)

The center of the ac load line

146.

Thermal runaway is

a)

Good for transistors

b)

Always desirable

c)

Useful at times

d)

Usually destructive

147.

The ac resistance of compensating diodes

a)

Must be included

b)

Is usually small enough to ignore

c)

Compensates for temperature changes

d)

Is very high

148.

A small quiescent current is necessary with a class B push-pull amplifier to avoid

a)

Thermal runaway

b)

Destroying the compensating diodes

c)

Crossover distortion

d)

Excessive current drain

149.

The zener current in a zener follower is

a)

Equal to the output current

b)

Smaller than the output current

c)

Larger than the output current

d)

Prone to thermal runaway

150.

In the two-transistor voltage regulator, the output voltage

a)

Is regulated

b)

Has much smaller ripple than the input voltage

c)

Is larger than the zener voltage

d)

All of the above

151.

For a class B push-pull emitter follower to work properly, the emitter diodes must

a)

Be able to control the quiescent current

b)

Have a power rating greater than the output power

c)

Have a voltage gain of I

d)

Match the compensating diodes

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