In a bipolar transistor which current is largest collector current base current

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Question
In a bipolar transistor which current is largest
Options
A. collector current
B. base current
C. emitter current
D. base current or emitter current

Correct Answer

emitter current

Explanation

Emitter current is larger, collector current is slightly less than emitter current and base current is very small.

Electronic Devices and Circuits problems

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1. In the circuit of figure the function of resistor R and diode D are
Options
A. to limit the current and to protect LED against over voltage
B. to limit the voltage and to protect LED against over current
C. to limit the current and protect LED against reverse breakdown voltage.
D. none of the above.

2. At room temperature the current in an intrinsic semiconductor is due to
Options
A. holes
B. electrons
C. ions
D. holes and electrons

3. The amount of photoelectric emission current depends on
Options
A. frequency of incident radiation
B. intensity of incident radiation
C. both frequency and intensity of incident radiation
D. none of the above

4. In p-n-p transistor the current I_E has two components viz. I_EP due to injection of holes from p-region to n-region and I_E due to injection of electrons from n-region to p-region. Then
Options
A. I_Ep and I_En are almost equal
B. I_Ep >> I_En
C. I_En >> I_Ep
D. either (a) or (c)

5. In an n-p-n transistor, the majority carriers in the base are
Options
A. electrons
B. holes
C. both holes and electrons
D. either holes or electrons

6. Assertion (A): The conductivity of p type semiconductor is higher than that of intrinsic semiconductor.
Reason (R): The addition of donor impurity creates additional energy levels below conduction band.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

7. A transistor has two p-n junctions. The batteries should be connected such that
Options
A. both junctions are forward biased
B. both junctions are reverse biased
C. one junction is forward biased and the other is reverse biased
D. none of the above

8. A transistor has a current gain of 0.99 in the CB mode. Its current gain in the CC mode is
Options
A. 100
B. 99
C. 1.01
D. 0.99

9. A p-n junction diode has
Options
A. low forward and high reverse resistance
B. a non-linear v-i characteristics
C. zero forward current till the forward voltage reaches cut in value
D. all of the above

10. Assertion (A): The reverse saturation current in a semiconductor diode is 4nA at 20�C and 32 nA at 50�C.
Reason (R): The reverse saturation current in a semiconductor diode doubles for every 10�C rise in temperature.
Options
A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

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