For proper operation of the transistor, its collector should have ___________

Which of the following conditions must be satisfied for a transistor to be in saturation? 1. Its collector to base junction should be under forward bias 2. Its collector to base junction should be under reverse bias 3. Its emitter to base junction should be under reverse bias 4. Its emitter to base junction should be under forward bias Which of the above conditions are correct?

A

1 and 3

B

2 and 3

C

2 and 4

D

1 and 4

Choose the right option among the alternatives – A transistor conducts in its forward direction when its collector/emitter/base, is positive with respect to its collector/emitter/base, and when a turn-on voltage or current signal is applied to its collector/emitter/base.

A

Collector, base, emitter

B

Emitter, collector, base

C

Base, collector, emitter

D

Collector, emitter, base

For transistor action (a) Base, emitter, and collector regions should have similar size and doping concentrations. (b) The base region must be very thin and lightly doped. (c) The emitter-base junction is forward biased and the base-collector junction is reverse biased. (d) Both the emitter-base junction as well as the base-collector junction are forward biased. Which one of the following pairs of statements is correct?

A

(d), (a)

B

(a), (b)

C

(b), (c)

D

(c), (d)

Consider an NMOS transistor having kn= 2 mA/V2. Let the transistor be biased at VOV = 1V. For operation in saturation, what dc bias current ID results? If a +0.1-V signal is superimposed on VGS, find the corresponding increment in collector current by evaluating the total collector current ID and subtracting the dc bias current ID.

A

ID = 1mA and Increment = 0.21 mA

B

ID = 1mA and Increment = 0.42 mA

C

ID = 2mA and Increment = 0.21 mA

D

ID = 2mA and Increment = 0.42 mA

For a narrow base PNP BJT, the excess minority carrier concentrations (ΔnE for emitter, ΔpB for base, ΔnC for collector) normalized to equilibrium minority carrier concentrations (nE0 for emitter, pB0 for base, nC0 for collector) in the quasi-neutral emitter, base and collector regions are shown below. Which one of the following biasing modes is the transistor operating in?

A

Forward active

B

Saturation

C

Inverse active

D

Cutoff

The total thermal resistance of a power transistor and heat sink is 20°C/W. The ambient temperature is 25°C and (TJ)MAX=200°C. If VCE=4V, find the maximum collector current that the transistor can carry without destruction. What will be the allowed value of collector current if ambient temperature rises to 75°C?

A

3.67A

B

7.56A

C

2.19A

D

1.56A

In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives. The English language is ___________ complex in character that it can scarcely be learned by rule, and can __________ be mastered by the study of such idioms and phrases as are provided in this book; but just as care must be taken to place every accent or stress _________ the proper syllable in the ______________ of every word it contains, so must the stress or emphasis be placed on the proper word in ___________ sentence spoken. proper word in ___________ sentence spoken.

A

all

B

while

C

every

D

as

If the power rating of a transistor is 1W and collector current is 100mA, then maximum allowable collector voltage is ___________

A

1V

B

100V

C

20V

D

10V

Given collector resistance = 2kΩ, load resistance = 5kΩ, collector capacitance = 1μF, emitter capacitance = 20μF, collector current = 2mA, source resistance = 2kΩ. If the effect of blocking capacitor is ignored, find the applicable cut-off frequency.

A

22.73 Hz

B

612 Hz

C

673Hz

D

317 Hz

Given that the collector power dissipation is 300 mW, what is the value of collector current for the collector to emitter voltage = 12 V?

A

50 mA

B

0 mA

C

25 mA

D

100 mA

For proper operation of the transistor, its collector should have ___________

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