Electrical Studys

1➤ In a transistor if β = 100 and collector current is 10 mA, then IE is …………

1 pointA. 100 mA B. 110 mA C. 100.1 mAD. none of the above

2➤ The most commonly used transistor arrangement is …………… arrangement

1 pointA. common emitter B. common baseC. common collectorD. none of the above

3➤ The input impedance of a transistor connected in …………….. arrangement is the highest

1 pointA. common emitter B. common collector C. common baseD. none of the above

4➤ The output impedance of a transistor connected in ……………. arrangement is the highest

1 pointA. common emitter B. common collector C. common baseD. none of the above

5➤ The phase difference between the input and output voltages in a common base arrangement is ………

1 pointA. 180o B. 90o C. 270o D. 0o

6➤ The power gain in a transistor connected in ……………. arrangement is the highest

1 pointA. common emitter B. common baseC. common collector D. none of the above

7➤ The phase difference between the input and output voltages of a transistor connected in common emitter arrangement is …………

1 pointA. 0°B. 180°C. 90°D. 270°

8➤ The voltage gain in a transistor connected in………. arrangement is the highest

1 pointA. common base B. common collectorC. common emitterD. none of the above

9➤ As the temperature of a transistor goes up, the base-emitter resistance …………

1 pointA. decreases B. increasesC. remains the sameD. none of the above

10➤ The voltage gain of a transistor connected in common collector arrangement is ………

1 pointA. equal to 1 B. more than 10C. more than 100D. less than 1

11➤ The phase difference between the input and output voltages of a transistor connected in common collector arrangement is ………

1 pointA. 180o B. 0oC. 90o D. 270o

12➤ IC = β IB + ……

1 pointA. ICBO B. ICC. ICEOD. αIE

13➤ BC 147 transistor indicates that it is made of ……

1 pointA. germanium B. siliconC. carbonD. none of the above

14➤ ICEO = (………) ICBO

1 pointA. β B. 1 + αC. 1 + βD. none of the above

15➤ A transistor is connected in CB mode. If it is not connected in CE mode with same bias voltages, the values of IE, IB and IC will ……

1 pointA. remain the same B. increaseC. decreaseD. none of the above

16➤ In a transistor, signal is transferred from a …………… circuit

1 pointA. high resistance to low resistance B. low resistance to high resistanceC. high resistance to high resistance D. low resistance to low resistance

17➤ The arrow in the symbol of a transistor indicates the direction of ………….

1 pointA. electron current in the emitterB. electron current in the collectorC. hole current in the emitterD. donor ion current

18➤ The leakage current in CE arrangement is ……………. that in CB arrangement

1 pointA. more than B. less than C. the sameD. as none of the above

19➤ A heat sink is generally used with a transistor to ………

1 pointA. increase the forward currentB. decrease the forward currentC. compensate for excessive dopingD. prevent excessive temperature rise

20➤ The most commonly used semiconductor in the manufacture of a transistor is ………

1 pointA. germanium B. siliconC. carbonD. none of the above

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