Wednesday, August 31, 2016
- Wednesday, August 31, 2016
- PunjabtechnicalUniversity ajay gour
- 3rd Semester AE(D), Elements Of Electrical And Electronics Engineering
- No comments
S.B. Roll No. _____________
ELEMENTS OF ELECTRICAL AND ELECTRONICS ENGINEERING
Duration 3 Hrs.
1. Fill in the blanks
a. In order to make up the level of acid in a lead acid cell_______is added.
b. In a R-L series circuit, current ______ behind the applied voltage.
c. If the frequency of an alternating current is 200 KHZ, its time period will be ____
d. The direction of rotation of 3 phase induction motor can be changed by ______
e. Highly skilled labour is required in _______ wiring system.
f. A ____________ is provided in an electrical circuit for safe guarding the installation against heavy currents.
g. Transformer core is made of laminations to reduce ______.
h. A PN junction conducts in _____ direction only.
i. An SCR or Thermistor is a _________ junction device.
j. An electric lamp of 60 watts will consume 1.8 units of energy in _____ hours.
Note : Attempt any five questions
a. Explain the working principle of transformer with neat diagram and also define transformation ratio.
b. Explain the terms cycle, frequency, amplitude and instantaneous value with diagram
c. Define the following terms specify their units
d. Name the various methods of earthing? Explain any one method in detail.
e. Explain light fan circuit, single phase power circuit and sub circuits used n domestic electrical instalaion.
f. What is a zener diode? Mention its application.
g. Define power factor and explain how power factor can be improved by using capacitors?
h. What is the difference between high voltage and low voltage distribution system?
Note : Attempt any three questions
3. Why is a starter required for starting a 3 phase induction motor? Draw a neat sketch of a star delta starter and explain its working
a. Explain any one method of charging of battery with neat circuit diagram.
b. Explain the advantages of electrical energy over other type of energy
a. Draw and explain volt ampere characteristic of a thyristor?
b. Describe electric shock and their preventive measures?
a. What are the various accessories and parts of domestic installation?
b. What is the necessity of transformer? Explain oil immersed natural cooling?
7. Wrote short note on any two:
a. Steeper motor
b. Differentiate between single phases and three phases supply
c. Faraday’s laws of electromagnetic indication.
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