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Wednesday, August 31, 2016

S.B. Roll No. _____________

3rd Exam/Mech/Auto/5341/0353/0532/0932/Dec’11

Duration 3 Hrs.
Q1. Fill in the blanks:
a. KWH is the unit of __________.
b. Electrical appliances such as washing machines, light point, fan and TV etc are connected in__________ with the supply.
c. Voltmeter is always connected in __________with the load.
d. The direction of the induced emf can be determined by __________.
e. A current is said to be alternating when it changes __________.
f. Transformer core is made of __________.
g. Tappings are provided on the transformer for varying the __________ voltage.
h. The secondary distribution system is carried out by __________ system.
i. The number of terminals in the terminal box of an inductor motor (3 phase) is __________.
j. Fuse is meant for the __________ of electrical circuit.
k. In ACSR conductor, the function of steel
l. Proper insulation of cables __________the leakage current.
m. Miniature circuit breaker is an __________ device.
n. Capacity of battery is measured in __________.
o. A zener diode is used as __________.

Section B

Note: Attempt any six questions: 6x5
Q2 i. Mention the advantages of electrical energy over other type of energy.
ii. In an a.c. system, define the following
a. Amplitude b. Cycle
c. Time period d. Frequency
iii. An a.c. circuit consists of pure resistance of 20 ohms and is connected across an a.c. supply of 200 volts, 50 Hz, calculate
a. Current b. Power consumed
c. Max. value of volt Vm
iv. What  is the necessity of cooling the transformer? Explain any one method of cooling.
v. Explain the working principle of an auto transformer?
vi. In case of 400 / 230 v, 3 phase 4 wire system, what is the voltage between any two phase wire and between any one phase and neutral with the help of suitable diagram.
vii. Explain, the indication of a fully charged cell.
viii. Explain the advantage and disadvantage of conduit wiring.

Section C

Note: Attempt any three questions:
Q3 a. What is power factor? Discuss how the power factor can be improved.
b. Describe disc type PM type stepper motor?
Q4 a. What is the purpose of fuse in an electrical circuit? Discuss the
properties of fuse wire.
b. What is electrical shock? Disuses how it can be treated.
Q5 a. How the direction of rotation of a 3 phase induction motor can be
b. Describe C.E configuration and its characteristics.
Q6 a. Discuss the important application of a Thermistor?
b. Why a PN junction is known as crystal diode? Give the important application of a diode?
Q7 a. What is sub circuits? Differentiate between light – fan and power sub

b. Discuss the maintenance free batteries.



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