Surprise Test - 18ECC102J Electronic Devices

Name

Register Number

For a transistor to operate in an active region what is the essential possible condition of biasing?

• a. Collector-base and emitter-base junctions are reverse biased.
• b. Collector-base junction is reverse biased and the emitter-base is forward biased
• c. Collector-base and emitter-base junctions are forward biased
• d. Collector-base junction is forward biased and emitter-base is reverse biased

What is the collector current when the base resistor is open?

• a. 1 mA
• b. 2 mA
• c. 0
• d. 10 mA

Amplifiers and oscillators using BJT, operate in ...... region

• a. Inverted mode
• b. Active
• c. Cut off
• d. Saturation

In a tansistor, IC = 100 mA and IE = 100.2 mA. The value of β is …………

• a. 100
• b. 50
• c. about 1
• d. 200

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

• a. 100 mA
• b. 100.1 mA
• c. 110 mA
• d. 120 mA

The relation between β and α is …………..

• a. β = 1 / (1 – α )
• b. β = (1 – α ) / α
• c. β = α / (1 – α )
• d. β = α / (1 + α )

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

• a. electron current in the emitter
• b. electron current in the collector
• c. hole current in the emitter
• d. donor ion current

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

• a. common emitter
• b. common collector
• c. common base
• d. none of the above