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Electronics and Communication Engineering - Exam Questions Papers

Exercise : Exam Questions Papers - Exam Paper 7
6.
In a certain network not containing any dependent sources, number of nodes = 4 and number of branches is equal to 6.
4
2
3
5
Answer: Option
Explanation:

No. of independent loop currents is 6 - 4 + 1 = 3.

7.
The following statements are true with respect to "Cascode Amplifier".
  1. The reduction in h12 and Miller capacitance result in negligible reverse internal feedback.
  2. A's is large loads cannot be connected.
  3. As a narrow band amplifier, it provides small range of cμ is reduced.
  4. As a narrow band amplifier it provides small range of frequencies parameters the effect of cμ reduces.
only 1
only 1 and 4
only 2 and 4
only 1 and 3
Answer: Option
Explanation:

Cascode is a wide band amplifier and it provides wide range of frequencies than CE stage and as is large, large loads can be connected.

8.
A 4 cm by 3 cm rectangular waveguide with air cavity, is operating at 12 GHz with TE11 mode. The cut-off frequency is:
6.25 GHz
4.75 GHz
1.5 GHz
8.75 GHz
Answer: Option
Explanation:

.

9.
For a bipolar transistor, avalanche multiplication factor depends on __________ .
VCE
VCB
VBE
none of these
Answer: Option
Explanation:

Avalanche multiplication factor

where, βVCBO = collector - emitter breakdown voltage with open circuited base.

10.
In the following transistor circuit VBE = 0. 7 V, rc = 25mV/IE, and β and the capacitance are very large

The mid-band voltage gain of the amplifier is approximately
- 180
- 120
- 90
- 60
Answer: Option
Explanation:

Midband voltage gain =

R'L = 3k || 3k = RC || RL = 1.5k

Thus .

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