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1. Hartley oscillator is planned with L1= 2mH, L2= 20 H and the variable capacitance. Find out the range of capacitance values is frequency of oscillation is varied from 2050 KHz to 3050 KHz.

2. Sketch the circuit diagram of single tuned class A power amplifier using NPN transistors and describe its operation in detail.

3. Describe how UJT works as the relaxation oscillator.

4. (a) Simplify function using Karnaugh map:

f (A, B, C, D) =   (0, 2, 6, 10, 11, 12)

f (Don't Care) =   (3, 5, 7, 8).

(b) Solve the following function by using EX-OR and EX-NOR gates:

f (A, B, C, D) = A B C + A B C + A C D + A C D.

5. Get the relationship between currents and relationship between voltages in the delta connected system. Therefore deduce equation for power in such system.

6. With the help of a neat and suitable sketch describe the construction and operation of attraction type moving iron instrument.

7. describe the constructional features of dc machine with neat and suitable sketch.

8. Describe construction and working of the SCR with appropriate graphs.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M912120

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