questions from each section. Question no. 1 and 5 are compulsory. Non-programmable scientific calculator is allowed. three
SECTION A 1.
(a) With the help of a neat diagram, explain the principle, construction and working of D.C. Generator.
10
(b) A 50 kVA, single phase transformer has 500 turns on the primary and 100 turns on the secondary. The primary is connected to 2100 V, 50 Hz supply. Calculate :
5
(i)
The secondary voltage for open circuit
(ii)
The current flowing through the two windings on full load
(iii) The peak value of flux B NA-013
1
P.T.O.
2.
(a) State and explain Kirchhoff's laws with example.
5
(b) Using node voltage method, find the current in 3 S2 resistance for the network shown in Figure 1.
5
2V 2
T
4V
4V Figure 1
3.
(a) What do you mean by an ideal ammeter ? How do you convert a given galvanometer into an ammeter ? Explain briefly.
5
(b) A moving coil meter has a resistance of 2 f2 and gives full scale deflection with 10 mA. Show how it can be used to measure voltage up to 250 V. 5 4.
(a) Discuss the concept of self and mutual inductance.
5
(b) In a given R — L circuit R = 2.5 SI and L = 0.2 H. Find the current through the circuit and power factor, if an alternating voltage v = 230 / 30° V having frequency 50 Hz is applied across the circuit. 5 ,
BNA-013
2
SECTION B
5.
6.
(a) What is the need of modulation ? Explain the modulation index, upper and lower side band frequencies in case of amplitude modulation.
10
(b) Explain the circuit operation of full wave bridge rectifier with proper waveshapes.
5
(a) What is a transistor ? Explain input and output characteristics of an NPN transistor in a common base configuration.
5
(b) The current gain of a transistor in a common base arrangement is 0.95. Find the voltage gain and power gain, if the load resistance of the output circuit is 500 kQ and input resistance is 100 O. 5 7.
(a) Write a short note on electromagnetic waves.
5
(b) The pulse repetition frequency (PRF) of a pulsed radar is 750 Hz. Find the maximum range in kilometers that the radar can detect a target. Also determine the range in miles (nmi). 5 8.
Write short notes on any two of the following : 2x5=10 (a)
Term-End Examination ... (b) A 50 kVA, single phase transformer has. 500 turns on the primary and 100 turns on. the secondary. The primary is connected to. 2100 V, 50 Hz supply. ... How do you convert a given galvanometer ... inductance. 5.
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