Electric Power Utilization And Energy Auditing B.E Question Bank : selvamtech.com

Name of the College : Selvam College of Technology
Subject Code/Name : 080280079-Electric Power Utilization And Energy Auditing
Dept : Electrical And Electronics Engineering
Degree : B.E
Year: : IV YEAR
Website : selvamtech.com
Document Type : Question Bank

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Electric Power Utilization And Energy Auditing Question Bank

UNIT – I

1. Define light.
Light is defined as that radiant energy in the form of waves which produces a sensation of vision upon the human eye.
2. Define luminous flux.
Luminous flux is defined as the energy in the form of light waves radiated per second from a luminous body.(eg.: incandescent lamp).

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3. Define luminous intensity.
Luminous intensity is defined as the flux emitted by the source per unit solid angle.
4. Define light energy.
** It is the energy obtained in visual radiations in a given time
** It is expressed in lumen – hour.
** It is denoted by Q.

5. Define radiant efficiency.
It is defined as the ration of energy radiated in the form of light to the total energy radiated by the body.
Radiant efficiency = Energy radiated in the form of light/Total energy radiated by the body

6. Define luminous efficiency.
It is defined as the output in lumens per watt of the power consumed by thee source of light. It is measured in lumens per wattage.
Luminous efficiency = Lumens emitted by the source/Wattage of source per light

7. Define plane angle.
When two straight lines lying in the same plane meet at a point, there will be an angle between these converging lines at the meeting point. This angle is termed as plane angle .In the above figure the angle AOB is the plane angle.

8. Define solid angle.
The angle subtended at a point in space by an area is termed as solid angle. In plane angle it is the area which is enclosed by two lines, but in case of solid angle. It is the Volume enclosed by numerous lines lying on the surface and meeting at a point.

10. Define candle power.
Candle power is the light rendering capacity of a source in a given direction and is defined as the number of lumens given out by the source in a unit solid angle in a given direction.

11. Define illuminance (or) illumination (or) Degree of illumination.
When the light falls on a surface it is illuminated. The illuminance is defined as the luminous flux received per unit area. Illuminance is denoted by the symbol E and is measured in lumens/m2 or lux or metre-candle.

12. Define foot candle.
It is illumination produced by a uniform source of one CP on the inner surface of sphere of one foot radius.
1 foot candle = 1 lumens/ft2

15. Define lux. (April/May 2005)
It is a metre candle and is defined as the illumination of the inside of the sphere of radius 1 metre at the center of which there is a source of 1 CP.

Unit – II

1.i) State the types of electric lamps used for illumination in different applications.(B1 4.24)
ii) Draw the circuit diagram of low-pressure discharge tube used as light source. Explain the operating principle of this device. (B1 4.18)

2.i) Distinguish between MHCP and MSCP. (B1 4.8)
ii) Explain the operating principle of anyone type of photometer. (B1 4.11)
iii) Draw the circuit diagram of high – pressure neon lamp and describe its operating principle(B2 3.27)

3. Explain the construction and working of
i) Carban arc lamp(B2 3.19)
ii)Flame arc lamp(B2 3.19)
iii) Magnetic arc lamp. (B2 3.19)

4. i) Define MSCP and luminous efficiency. ( B1 4.8)
ii)When a 250 V lamp takes a current of 0.8A,it produces a total flux of 3260 lumens . Calculate a) MSCP of the lamp b )efficiency of the lamp.

5.i) What are the various types of lighting scheme? (B2 3.37)
ii) Enumerate the various factors, which have to be considered while designing lighting scheme. (B2 3.40)

6.i) Define candle power and lux. (B1 4.3)
ii) A workshop measuring 15m X 25m.,is lighted by 30 lamps of 200W, each having an efficiency of 15 lumens/watt. Assuming utilization factor of 0.5 and depreciation factor of 0.75. Find the illumination on the working plane.

7. Describe the salient features of ( B1 4.35)
a) Street lighting
b) Flood lighting

8. A corridor is lighted by lamps spaces 9.15m apart and suspended at a height of 4.575m above the centerlines of the floor. If each lamp gives 100 candle power in all directions below the horizontal . Find the maximum and minimum value of the illumination on the floor along the centerline.
9. A hall 30 metre long and 12 metre wide is to be illuminated and illumination required is 50 meter candles. compute the number, wattage, location and mounting height of lamps. Depreciation factor = 1.3 and utilization coefficient = 0.5. Light output of different lamps are given below.
10. i) Explain the construction and working of a sodium vapour lamp.(B1 4.21) (April-2005)