Electronics and Communication Engineering - Exam Questions Papers

11. 

For the BJT shown in figure, β = 50, the value of VCE is:

A. 3.13 V
B. 4.24 V
C. 5.18 V
D. none

Answer: Option D

Explanation:

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12. 

An average response rectifier type electronic voltameter has a d.c. voltage of 10 V applied to it. What is the meter reading?

A. 7.1 V
B. 10 V
C. 11.1 V
D. 22.2 V

Answer: Option C

Explanation:

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13. 

Consider the common emitter amplifier shown below with the following circuit parameters: β = 100, gm = 0.3861 A/V, r0 = ∞ rp = 259 Ω, Rs = 1 kΩ, RB = 93 kΩ, RC = 250 Ω, RL = 1 kW, C1 = ∞ and C2 = 4.7mF.

The lower cut-off frequency due to C2 is

A. 33.9 Hz
B. 27.1 Hz
C. 13.6 Hz
D. 16.9 Hz

Answer: Option A

Explanation:

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14. 

Number of fundamental cut-sets of any graph will be

A. same as the number of twigs
B. same as the number of tree branches
C. same as the number of nodes
D. equal to one

Answer: Option A

Explanation:

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15. 

Consider a silicon p-n junction at room temperature having the following parameters:
Doping on the n-side = 1 x 1017 cm-3
Depletion width on the n-side = 0.1 μm
Depletion width on the p-side = 1.0 μm
Intrinsic carrier concentration = 1.4 x 1014F. cm-1.
Thermal voltage = 26mV
Permittivity of free space = 8.85 x 10-14F. cm-1.
Dielectric constant of silicon = 12. A built in potential of the junction.

A. is 0.70V
B. is 0.76V
C. is 0.82V
D. cannot be estimated from the data given

Answer: Option B

Explanation:

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