Transistor: Working

Q. A transistor has a base current of 1 mA and emitter current 90 mA. The collector current will be

1. 90 mA
2. 1 mA
3. 89 mA
4. 91 mA

Q.

In the common base mode of a transistor, the collector current is 5.488 mA for an emitter current of 5.60 mA. The value of the base current amplification factor $\left(\beta \right)$ will be

1. 48

2. 49

3. 50

4. 51

Q.

A NPN transistor conducts when

1. Both collector and emitter are negative with respect to the base
2. Collector is positive and emitter is at same potential as the base
3. Collector is positive and emitter is negative with respect to the base
4. Both collector and emitter are positive with respect to the base

Q.

In an NPN transistor circuit, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, the emitter current (i_E) and base current (i_B) are given by

1. 

2. 

3. 

4. 

Q.

If a = 0.98 and current through emitter i_e = 20 mA, the value of B(beta) is

1. 4.9
2. 49
3. 96
4. 9.6

Q. Why is resistance less when resistors are joined in parallel?

Q.

When NPN transistor is used as an amplifier

1. Electrons move from based to collector

2. Holes move from emitter to base

3. Electrons move from collector to base

4. Holes move from base to emitter

Q.

In a common base amplifier, the phase difference between the input signal voltage and output voltage is

1. $\frac{\pi }{2}$

2. $0$

3. $\pi$

4. $\frac{\pi }{4}$

Q. A working transistor with its three legs marked P, Q and R is tested using a multi-meter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multi-meter. Which of the following is true for the transistor?

1. It is an p-n-p transistor with R as emitter
2. It is an n-p-n transistor with R as base
3. It is an n-p-n transistor with R as collector
4. It is an p-n-p transistor with R as collector