Introduction to Transistor

Q.

The emitter-base junction of a transistor is ...... biased while the collector-base junction is ....... biased .

1. Reverse, forward

2. Forward, reverse

3. Reverse, reverse

4. Forward, forward

Q.

Least doped region in a transistor

1. Either emitter or collector

2. Base
3. Emitter
4. Collector

Q.

What is the cause of heating effect of electric current?

Q.

A transformer is an electrical device, which is used for changing

1. Alternating voltages

2. Direct voltages

3. Either (a) or (b)

4. Neither (a) nor (b)

Q. Which is the smallest segment of a transistor?

1. a
2. b
3. c
4. d

Q.

A coil of inductive reactance $31\Omega$ has a resistance of $8\Omega$. It is placed in series with a condenser of capacitive reactance $25\Omega$. The combination is connected to an $a.c.$. source of $110$ volts. The power factor of the circuit is.

1. $0.80$

2. $0.33$

3. $0.56$

4. $0.64$

Q.

Prove that the heat produced in a conductor of resistance $R$ on passing current $I$ through it for time $t$ is $H=I^{2}Rt$.

Q.

In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is

1. 0.2 mA
2. 0.29 mA
3. 0.4 mA
4. 0.35 mA

Q.

What is the difference between the amplifier and oscillator?

Q.

A charge of $90,000coulombs$ flows through a conductor at a potential difference of $60V$ for one hour. What is the magnitude of heat energy produced?

Q. The monitor of a computer is connected to it by a ____________.

1. Wire
2. Cable
3. Bus
4. Line driver
5. Moderm

Q. what are all difference between solonoid and a torroi

Q.

In the case of constants a and b of a transistor

1. a = b
2. b < 1 a > 1
3. ab = 1
4. b > 1 a < 1

Q.

Are all transistors the same?

Q.

In a common emitter transistor, the current gain is 80. What is the change in collector current, when the change in base current is 250 mA

1. 80 ´ 250 mA

2. (250 - 80) mA
3. (250 + 80) mA
4. 250/80 mA

Q.

1. 

2. 

3. 

4. 

Q.

An oscillator is nothing but an amplifier with

1. Positive feed back

2. Large gain

3. No feedback

4. Negative feedback

Q.

In Lenzs Law, the effect means___

Q. Which TTL sub-family has maximum speed ________________.

1. Standard TTL
2. Schottky-clamped TTL
3. High speed TTL
4. Low power TTL