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 06
Duration: 3 hrs.
1. Fill in the blanks
a. Temperature coefficient of a metal conductor increases with __________in temperature.
b. A _________ cell is one that cannot be charged.
c. E.M.F of cell is always ______ than its terminal voltage.
d. While applying kickoffs laws direction of current flow may be assumed either clockwise or __________
e. The unit of electric flux ___________
f. Ferromagnetic materials lose their _______ property at a _____ known as curie point.
g. When even flux linked with a circuit changes an ______ is always induced in it.
h. The self –induction of a coil is also called its ________ inertia.
i. The average valve of a symmetrical sinusoidal alternating current is ______
j. In a series R-L circuit always _______ behind the applied voltage.
Note: Attempt any six questions
a. How potential differences is maintained in an electric circuit.
b. State and explain ohm’s law
c. Two coil connected in series have a resistance of 18Ω and when connected in parallel have a resistance of 4 Ω. Find the resistance of the coil.
d. Explain construction of lead acid battery.
e. Derive an expression for the force acting between two parallel current carrying conductors.
f. State and explain faraday’s laws of electromagnetic inductions.
g. What do you mean by alternating voltage and current.
3. Explain care and maintenance of lead acid battery.
Explain the following
a. Lenz’s law
b. Fleming’s right hand rule
4. Define the following term as applied to alternating current:
a. Wave form
b. Instantaneous valve
e. R.M.S valve
A coil having resistance of 5 Ω ohm and an inductance of 31.8 m H is connected across a 200 v 50 Hz supply calculate
a. Current taken
b. Power factor
c. Power consumed
5. Write the short note on any two
a. Advantages of 3 phase over single phase system
b. Power factor improvement
c. Causes of low power factor
d. Application of lead acid battery.
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