Question 1

In the circuit shown in Figure 7-26,if R1 opens 1 opens   A)  the collector voltage will be 10 V. B)  the collector voltage will be 0 V. C)  the base voltage will be 10 V. D)  the emitter voltage will be 10 V." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   the collector voltage will be 10 V.
B)   the collector voltage will be 0 V.
C)   the base voltage will be 10 V.
D)   the emitter voltage will be 10 V.E) A) and D)
F) A) and C)

Question 2

Collector-feedback bias is still sensitive to changes in current gain,but it is used because of its

Accepted Answer

A)   small size.
B)   low cost.
C)   simplicity.
D)   complexity.E) All of the above
F) B) and D)

Question 3

With ambiguous troubles,the troubleshooter very often must

Accepted Answer

A)   replace all suspected components.
B)   memorize the circuit diagram.
C)   disconnect one suspected component and test it.
D)   disconnect all suspected components and apply power.E) A) and C)
F) A) and B)

Question 4

In Figure 7-21,what effect do the capacitors have on the bias voltage in each stage?

Accepted Answer

A)   increase
B)   decrease
C)   causes a cutoff condition
D)   no effectE) A) and B)
F) A) and C)

Question 5

In order to determine the emitter current for the circuit shown in Figure 7-21,you must

Accepted Answer

A)   subtract 0.7 V from 15 V and then divide by 20 kW.
B)   subtract 0.7 V from 15 V and then divide by 10 kW.
C)   subtract 0.7 V from 15 V and then divide by 33 kW.
D)   add 0.7 V to 15 V and then divide by 20 kW.E) A) and B)
F) A) and C) A

Question 6

What should a troubleshooter do if the base,collector,and emitter voltages in a transistor circuit all measure 0 V?

Accepted Answer

A)   replace the transistor
B)   check supply voltage and leads
C)   disconnect base resistors
D)   check collector resistorE) A) and B)
F) C) and D)

Question 7

To prevent meter loading,a voltmeter used to make transistor circuit voltage measurements should have an input impedance of ________.

Accepted Answer

A)   10 kW
B)   100 kW
C)   1 MW
D)   10 MWE) B) and C)
F) C) and D) D

Question 8

Using a firm voltage divider means that the collector current will be approximately

Accepted Answer

A)   5 percent lower than the stiff value.
B)   10 percent lower than the stiff value.
C)   50 percent lower than the stiff value.
D)   10 percent higher than the stiff value.E) B) and D)
F) B) and C)

Question 9

If RE is adjusted to its maximum value in Figure 7-16,the Q point moves toward saturation.

Accepted Answer

A) True 
 B)False

Question 10

Collector-feedback bias is also called

Accepted Answer

A)   self-bias.
B)   collector follower.
C)   negative collector.
D)   voltage-divider.E) All of the above
F) A) and C)

Question 11

The biasing configuration shown in Figure 7-18 is derived from emitter bias and is referred to as

Accepted Answer

A)   emitter derived bias (ED
B)  .
B)   bi-polar emitter bias (BPE
B)  .
C)   two-supply emitter bias (TSE
B)  .
D)   one-supply emitter bias (OSE
B)  .E) A) and B)
F) A) and C)

Question 12

While troubleshooting the circuit shown in Figure 7-26,the base voltage measures 1.8 V and the collector voltage measures 10 V,what should the technician do? E C)  check R1 D)  check voltage source and leads" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   replace the transistor
B)   replace RE
C)   check R1
D)   check voltage source and leadsE) C) and D)
F) A) and D) A

Question 13

Collector-feedback bias is also called

Accepted Answer

A)   collector-follower bias.
B)   emitter-feedback bias.
C)   voltage-divider bias.
D)   self-bias.E) A) and D)
F) None of the above

Question 14

A well-designed voltage-divider bias circuit is one in which the voltage divider appears stiff to the input resistance of the base.

Accepted Answer

A) True 
 B)False

Question 15

With the switch in the position as shown in Figure 7-4 (a),the LED is on.

Accepted Answer

A) True 
 B)False

Question 16

Whenever you have a circuit with npn transistors,you can often use the same circuit with pnp transistors and

Accepted Answer

A)   a negative power supply.
B)   and an ac source.
C)   a positive power supply.
D)   a floating ground.E) A) and B)
F) B) and C)

Question 17

Once the base voltage has been calculated for the circuit shown in Figure 7-29 (b) ,emitter voltage can be calculated by

Accepted Answer

A)   adding 0.7 V to the base voltage.
B)   subtracting 0.7 V from the base voltage.
C)   adding 0.3 V to the base voltage.
D)   subtracting 0.3 V from the base voltage.E) A) and B)
F) A) and C)

Question 18

The intent of emitter-feedback bias is to

Accepted Answer

A)   reduce the source voltage.
B)   swamp out the variations in current gain.
C)   swamp out the base current.
D)   increase current gain.E) B) and D)
F) All of the above

Question 19

Voltage-divider bias is really emitter bias in disguise.

Accepted Answer

A) True 
 B)False

Question 20

Since voltage-divider bias is derived from emitter bias,the Q point is virtually immune to changes in current gain.

Accepted Answer

A) True 
 B)False

Exam 7: BJT Biasing

In the circuit shown in Figure 7-26,if R1 opens

Correct AnswerverifiedShow Answer

Collector-feedback bias is still sensitive to changes in current gain,but it is used because of its

Correct AnswerverifiedShow Answer

With ambiguous troubles,the troubleshooter very often must

Correct AnswerverifiedShow Answer

In Figure 7-21,what effect do the capacitors have on the bias voltage in each stage?

Correct AnswerverifiedShow Answer

In order to determine the emitter current for the circuit shown in Figure 7-21,you must

Correct AnswerverifiedA

What should a troubleshooter do if the base,collector,and emitter voltages in a transistor circuit all measure 0 V?

Correct AnswerverifiedShow Answer

To prevent meter loading,a voltmeter used to make transistor circuit voltage measurements should have an input impedance of ________.

Correct AnswerverifiedD

Using a firm voltage divider means that the collector current will be approximately

Correct AnswerverifiedShow Answer

If RE is adjusted to its maximum value in Figure 7-16,the Q point moves toward saturation.

Correct AnswerverifiedShow Answer

Collector-feedback bias is also called

Correct AnswerverifiedShow Answer

The biasing configuration shown in Figure 7-18 is derived from emitter bias and is referred to as

Correct AnswerverifiedShow Answer

While troubleshooting the circuit shown in Figure 7-26,the base voltage measures 1.8 V and the collector voltage measures 10 V,what should the technician do?

Correct AnswerverifiedA

Collector-feedback bias is also called

Correct AnswerverifiedShow Answer

A well-designed voltage-divider bias circuit is one in which the voltage divider appears stiff to the input resistance of the base.

Correct AnswerverifiedShow Answer

With the switch in the position as shown in Figure 7-4 (a),the LED is on.

Correct AnswerverifiedShow Answer

Whenever you have a circuit with npn transistors,you can often use the same circuit with pnp transistors and

Correct AnswerverifiedShow Answer

Once the base voltage has been calculated for the circuit shown in Figure 7-29 (b) ,emitter voltage can be calculated by

Correct AnswerverifiedShow Answer

The intent of emitter-feedback bias is to

Correct AnswerverifiedShow Answer

Voltage-divider bias is really emitter bias in disguise.

Correct AnswerverifiedShow Answer

Since voltage-divider bias is derived from emitter bias,the Q point is virtually immune to changes in current gain.

Correct AnswerverifiedShow Answer

In the circuit shown in Figure 7-26,if R₁ opens

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D

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If R_E is adjusted to its maximum value in Figure 7-16,the Q point moves toward saturation.

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A

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