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QUESTION: 1

For a BJT, what is typically the shape of the power dissipation curve, if it’s plotted on the output characterisics?

Solution:

Power Dissipation in a BJT is given by P=V_{CE}.I_{C}. This is in the form of k=xy which is the equation of a hyperbola.

QUESTION: 2

What is the region on the output characteristics below I_{C} = I_{CEO} line called?

Solution:

The region below I_{C} = I_{CEO} is called the cutoff region.

QUESTION: 3

What is the region on the output characteristics for V_{CE} < V_{CEsat} called?

Solution:

The region below V_{CE} < V_{CEsat} is called the saturation region.

QUESTION: 4

In a BJT amplifier the power gain from base to collector is 4000. The power gain in dB is

Solution:

Gain in dB = 10 log (4000).

QUESTION: 5

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

Solution:

P=V_{CE}.I_{C} => 300mW = (12V)I_{C} => I_{C}=300/12 mA = 25 mA.

QUESTION: 6

Given that the collector power dissipation is 300 mW, what is the value of collector to emitter voltage for collector current = 50 mA?

Solution:

P=V_{CE}.I_{C} => 300mW = V_{CE}(50 mA) => V_{CE} = 300/50 = 6 V.

QUESTION: 7

From the given curve tracer response, what is the value of β for I_{C} = 7 mA and V_{CE} = 5 V?

Solution:

From the curve, we get change in I_{C} = (8.2-6.4) mA and change in I_{B} = 10 uA. Hence, /beta; = (1.8/0.01) = 180.

QUESTION: 8

If the positive lead of a DMM, with the mode set to ohmmeter is connected to the base and the negative lead to the emitter and a low resistance reading is obtained, then what is the type of transistor that is being tested?

Solution:

If the positive lead of a DMM, with the mode set to ohmmeter is connected to the base and the negative lead to the emitter and a low resistance reading is obtained, then what is the type of transistor that is being tested is npn.

QUESTION: 9

If the positive lead of a DMM, with the mode set to ohmmeter is connected to the base and the negative lead to the emitter and a high resistance reading is obtained, then what is the type of transistor that is being tested?

Solution:

If the positive lead of a DMM, with the mode set to ohmmeter is connected to the base and the negative lead to the emitter and a low resistance reading is obtained, then what is the type of transistor that is being tested is npn.

QUESTION: 10

For the given transistor, what is the correct sequence of the pins from left to right?

Solution:

With the curved side facing away the correct lead sequence is base, collector, emitter.

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