Answer all questions
All questions carry equal marks
1 (a) Explain construction and the principle of operation of DC generator
(b) A 4 pole DC generator has a lap wound armature with 90 slots each containing 6 conductors. If the generator runs at 1500 r.p.m. The flux per pole is 0.03 Wb, Calculate the emf generated.
(b) Explain the speed control methods motor.
3 (a) Explain the principle of operation of single phase transformer
(b) The no load ratio of a 50 Hz, single phase transformer is 6000/250 V, estimate the number of turns in each winding if the maximum flux is 0.06 Wb in the core
(b) What are the losses in a transformer? Explain them.
5 (a) Derive the expression for maximum torque in induction motor.
(b) List out various applications of Induction motors.
(b) Define and explain slip of 3-phase induction motor.
7. Explain in detail about forward bias and reverse bias characteristics of PN junction diode. Also illustrate the Volt – Amp characteristics of the same.
11 (a) (i) Convert the binary number 101101.10101 in to decimal number.
(i) Add and subtract the binary numbers 101101.0101 and 10001.101
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