In an n-p-n transistor, the majority carriers in the base are electrons holes bo

CuriousTab

CuriousTab

Home Aptitude

Discussion

Home ‣ Electronics and Communication Engineering ‣ Electronic Devices and Circuits Comments

Question
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

Correct Answer

electrons

Explanation

Emitter is n type and emits electrons which diffuse through the base.

Electronic Devices and Circuits problems

Search Results

1. A zener diode is used in
Options
A. voltage regulator circuit
B. amplifier circuits
C. both voltage regulator and amplifier circuit
D. none of the above

2. Consider the common emitter amplifier shown below with the following circuit parameters: ? = 100, g_m = 0.3861 A/V, r₀ = ? r_p = 259 ?, R_s = 1 k?, R_B = 93 k?, R_C = 250 ?, R_L = 1 kW, C₁ = ? and C₂ = 4.7mF.

The resistance seen by the source Vs is
Options
A. 258 ?
B. 1258 ?
C. 93 k?
D. ?

5. In the circuit shown, in switch S is open for a long time and is closed at t = 0. The current i(t) for t ? 0⁺ is
Options
A. i(t) = 0.5 - 0.125e^-1000t A
B. i(t) = 1.5 - 0.125e^-1000t A
C. i(t) = 0.5 - 0.5e^-1000t A
D. i(t) = 0.375e^-1000t A

6. 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)

7. 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

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

9. 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.

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

Comments

There are no comments.

More in Electronics and Communication Engineering: