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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 5
11.
The current through a PN Junction diode with v volts applied to the P region to the N region, where (I0 is the reverse saturation current to the diode, m the ideality factor, k the Boltzmann constant, T the absolute temperature and q the magnitude of charge on an electron) is
I0 (e-qv/mkT - 1)
I0 e-qv/mkT
I0 (1 - eqv/mkT)
I0 (eqv/mkT - 1)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
The ratio of diffusion constant for hole DP to the mobility for holes is proportional to
T2
T
1/T
T3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
The carrier mobility in a semiconductor is 0.4 m2/Vs. Its diffusion constant at 300k will be (in m2/s).
0.43
0.16
0.04
0.01
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
During induction heating of metals which of the following is abnormally high?
Frequency
Voltage
Current
Power factor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.

Assertion (A): Alkali metals are used as emitters in phototubes.

Reason (R): Alkali metals have low work functions.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not a correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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