The conductivity of intrinsic semiconductor is given by eni(?p - ?n) eni(?p + ?n

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Question
The conductivity of intrinsic semiconductor is given by
Options
A. en_i(?_p - ?_n)
B. en_i(?_p + ?_n)
C. n_i(?_p + ?_n)
D. n_i(?_p?_n)

Correct Answer

en_i(?_p + ?_n)

Explanation

For intrinsic semiconductor,

Conductivity = (Electron charge) x (Number of charge carriers) x (Sum of mobilities of holes and electrons).

More questions

2. The directive gain of a transmitting antenna is
Options
A. proportional to wavelength
B. inversely proportional to wavelength
C. proportional to square of wavelength
D. inversely proportional to square of wavelength

3. Assertion (A): An artificial transmission line can be used as a pulse generator.
Reason (R): A pulse function is used very frequently in network analysis.
Options
A. Both A and R are correct and R is correct explanation of A
B. Both A and R are correct but R is not correct explanation of A
C. A is correct but R is wrong
D. A is wrong but R is correct

4. In a broadcast superheterodynes receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 100. If the intermediate frequency is 455 kHz. The rejection ratio at 25 MHz will be
Options
A. 1.116
B. 1.386
C. 2.116
D. 2.386

5.

	List I (Theorems)		List II (Property of Network)
A.	h₁₁	1.	1/(r_e + r_d)
B.	h₁₂	2.	r_b + r_e
C.	h₂₁	3.	?_bc
D.	h₂₂	4.	?_cb

Options
A. A-2, B-1, C-4, D-3
B. A-4, B-3, C-2, D-1
C. A-2, B-3, C-4, D-1
D. A-4, B-1, C-2, D-3

6. Which element exhibits the property of inertia?
Options
A. Resistance
B. Capacitance
C. Inductance
D. Both resistance and inductance

7. The input impedance of short-circuited line of length l where ?/4 < l < ?/2, is
Options
A. resistive
B. inductive
C. capacitive
D. none of the above

8. At a frequency equal to cutoff frequency in a rectangular wave guide
Options
A. the flow of electromagnetic energy is zero
B. the flow of electromagnetic energy is infinite
C. the flow of electromagnetic energy is 50% of maximum
D. the flow of electromagnetic energy is 10% of maximum

9. A directional coupler is used
Options
A. to transmit microwave signals
B. to generate microwave signals
C. to measure amplitude and phase of a travelling wave
D. both (a) and (b)

10. Match the following:

	List I		List II
A.	Direct addressing	1.	MOV A, M
B.	Register addressing	2.	MOV C, A
C.	Register indirect addressing	3.	LDA 7
D.	Immediate addressing	4.	STA FFC

Options
A. A-1, B-2, C-3, D-4
B. A-4, B-2, C-1, D-3
C. A-2, B-3, C-4, D-1
D. A-3, B-2, C-1, D-4

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