Part A: I. Select the correct answer from the choices given: 15 x 1 = 15 1. Name a unipolar device. a) Diode b) BJT c) FET d) TRIAC
2. For faithful amplification the operating point is chosen at the a) Centre of the active region b) Cut off region c) Saturation region d) Inversion region
3. What is the phase difference between input and output of a transistor CB amplifier? a) 0 b) 600 c) 900 d) 1800
4. What happens to the input impedance of an amplifier when voltage series negative feedback is applied? a) Remains same b) Increases c) Decreases d) Oscillates
5. Virtual ground concept relates voltage at the inverting terminal VA to the voltage at noninverting terminal VB by the relation a) VA > VB b) VA – VB = 0 c) VA < VB d) VA – VB = 1
6. Mention the output of an integrator if the sine wave is given to its input. a) Cosine wave b) Sine wave c) Square wave d) Triangular wave
7. Mention the high frequency stability oscillator a) Crystal oscillator b) Hartley oscillator c) Wein bridge oscillator d) Colpitts oscillator
8. Which layer of the ionosphere is called Kennelly-Heaviside layer? a) D layer b) E layer c) F1 layer d) F2 layer
9. How many sidebands present in AM? a) 1 b) 2 c) 3 d) ∞
10. A SCR has a) Two junctions and three layers b) Three junctions and three layers c) Three junctions and four layers d) Four junctions and three layers
11. Gray code is used in shaft position a) Multiplexer b) decoder c) encoder d) de-multiplexer
12. Logic expression for the output of XOR gate is a) Y = A̅̅̅̅B̅ b) Y = A̅̅̅+̅̅̅B̅ c) Y = A̅B + AB̅ d) Y = A̅B̅ + AB
13. How many timers are present in 8051 microcontroller? a) 1 b) 2 c) 3 d) 4
14. Size of an integer in C programming is a) 1 byte b) 2 byte c) 4 byte d) 8 byte
15. Shapes of cells in mobile network operation system is a) Octagonal b) Circular c) Oval d) Hexagonal
II. Fill in the blanks by choosing appropriate answer from those given in the bracket: 5 x 1 = 5 [ a) data b) modulation c) biasing d) impedance e) switching speed ]
16. FET has high ………………. 17. Application of suitable voltage across the terminals of a transistor is called …………… 18. CC amplifier is used to match ………… 19. Process of changing some characteristics of carrier in accordance with instantaneous value of the signal is called ……… 20. Flip-Flops are used to store …………
Part B: III. Answer any FIVE questions: 5 x 2 = 10 21. Mention any two advantages of voltage divider biasing. 22. Write the steps involved in drawing DC equivalent circuit of an amplifier. 23. Calculate gain of a negative feedback amplifier with an internal gain, A = 100 and feedback factor β = 0.1. 24. Determine frequency of Hartley oscillator. Given L1 = 4 mH, L2 = 2 mH and C =10 nf 25. Compare forward characteristics of power diode for two different junction temperatures. 26. Write minterm designation table for two input variables. 27. Write any two comparisons between Microprocessor and Microcontroller. 28. Mention any four operators used in C programming. 29. Distinguish between uplink and downlink signals.
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