29-06-2012, 11:33 AM
Electrical and Electronics Engineering
UTILIZATIONOFELECTRICALENERGY.pdf (Size: 189.17 KB / Downloads: 67)
1. a) What is an electric drive? Classify various types of electric drives and discuss their
merits and demerits.
b) A 200 V shunt motor has an armature resistance of 0.5 Ohm. It takes a current of
16 amps on full load and runs at 600 r.p.m. If a resistance of 0.5 Ohm is placed in
the armature circuit, find the ratio of the stalling torque to the full load torque. And
derive the expression used.
2. a) What are the applications of high frequency eddy current heating? Also explain the
principle of high frequency eddy current heating.
b) Give relative advantages and disadvantages of direct and indirect electric arc
furnaces.
3. a) What are the advantages and disadvantages of electric welding processes.
b) Describe briefly the various types of arc welding processes used in industry.
4. a) What are polar curves? Explain Rousseau’s diagram and its importance in
illumination engineering.
b) A lamp fitted with 120 degrees angled cone reflector illuminates circular area of
200 meters in diameter. The illumination of the disc increases uniformly from 0.5
meter-candle at the edge to 2 meter-candle at the center. Determine
i. the total light received
ii. Average illumination of the disc
iii. Average c.p. of the source
5. a) Compare a tungsten filament lamp with fluorescent lamp in detail.
b) Enumerate the various factors, which have to be considered while designing any
lighting scheme. [8+8]
6. a) Discuss about electric traction system in India. How it is different from distribution
system.
b) Explain the requirements of ideal traction and show which drive satisfies almost all
the requirements.