Tuesday, September 6, 2016
- Tuesday, September 06, 2016
- PunjabtechnicalUniversity ajay gour
- 3rd Semester Electrical(D), Electrical Engineering Materials Electrical(D) 3rd
- No comments
S.B. Roll No.______
ELECTRICAL ENGINEERING MATERIALS
3rd Exam/Elect/5206/May 10
Duration: 3 hrs.
1. Fill in the blanks
a. If a current of 100 mA flows through a resistance of 100 . the power consumed in the resistance is ______.
b. One kilowatt hour is 200 watts used for ________ hours.
c. In order to calculate The venin resistance, voltage source is replaced by _______
d. The unit of flux density is ________
e. In a composite magnetic circuit, the total reluctance will _________ of individual parts.
f. The energy stored in the magnetic field is __________
g. A lead acid cell should not be discharged beyond _____________ volts.
h. Wheat stone bridge is used to measure _________
i. In a pure inductive circuit, the voltage will ______ the current by 90
j. In two wattmeter method, when the point of the load is zero leading or lagging, the two wattmeter will give______ reading.
Note: Attempt any five questions
a. Explain Kirchhoff’s current law and Kirchhoff’s voltage law.
b. Define resistance and what are the factors affecting and resistance of a conductor?
c. Find the force per meter length between two conductors 0.05 m apart carrying 1000 A and 5000 A respectively.
d. Explain self induced e.mf. and mutually induced e.m.f.
e. What are the essentials of an electric cell? How the cell are classified?
f. Explain the terms amplitude, cycle, time period, frequency and phase difference as applicable to alternation wave forms.
g. Explain with mathematical expression that power consumed in a pure inductance is zero.
Note: Attempt any three questions
3. State and explain Norton’s theorem. Show that this theorem is just the converse of The venin’s theorem.
a. Explain eddy current loss
b. Give analog between electric and magnetic circuits.
5. Explain constant current and constant voltage method of charging a battery.
6. Explain constant current and constant voltage method of charging a battery.
7. Derive an expression for the total power in balanced 3 phase load.
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