Friday 20 April 2012

ELECTRICAL ENERGY GENERATION UTILIZAION AND CONSERVATION - QB


QUESTION BANK
Department of Electrical & Electronics Engineering
Sub. Name with code: EE-1451 ELECTRICAL ENERGY
GENERATION UTILIZAION AND CONSERVATION     Class: IV EEE
UNIT-1
PART-A
1.      Give any two reasons to go for non-conventional sources for power generation.
2.      Draw a typical daily load curve.
3.      Give two examples of renewable energy sources.
4.      What is the minimum wind velocity required for power generation through the wind mill.
5.      Give four sources non-conventional energy.
6.      Name the various semi-conductors used for photovoltaic conversion.
7.      Mention any two advantages of non-conventional energy sources.
8.      Define co-efficient of performance with respect to wind mill.
9.      What is the difference between condensing and non-condensing type steam power plants?
  1. What is thermal efficiency?
  2. Name the fuels used for gas turbines?
  3. What are the types of wind mills?
  4. What is the power generating station?
  5. What is the steam condenser?
  6. Mention any two advantages of non conventional energy sources.
16.   

PART-B
1.      Explain with a neat sketch the principle of MHD power generation.[16]
2.      Give the working of wind electric generating plant. Discuss the operational problems associated with this plant.[16]
3.      (i) What are the basic components of solar PV system?[8]
(ii) Explain the basic solar PV system used for power generation.                                                                                                                     [8]
4.      Give a brief review of generation of electrical power by any two conventional methods.[16]
5.      Describe briefly the generation of electrical power by conventional methods [16].
6.      Describe with a neat sketch the working of a wind energy conversion system.[16]
7.      Explain in detail about the electric energy generation by tidal and wind power.[16]
8.      Write about the concept of distributed generation and its effect on system operation.[16]







UNIT-2
PART-A
1.    What is meant by geothermal energy?
2.    State the advantages of power factor improvement.
3.    State a few methods of improving the power factor in the industry.
4.    What are the different types of tariffs?
5.    Define load factor.
6.    What are the causes of low power factor?
7.    What is meant by load curve?
8.    Why is electrical energy conservation important?
9.    What do you mean by Economics of power generation?
10.  Explain the term depreciation.
11.  Define energy audit.

PART-B
1.      Explain how energy conservation is carried out for a HT industry.[16]
2.      (i) Discuss the various methods for power factor improvement.[8]
(ii) Write a brief note on power quality.[8]
3.      Discuss the following tariffs: [16]
(i)                 Two part tariff.
(ii)               Three part tariff.
(iii)             Flat demand tariff.
(iv)             Straight meter rate tariff.
4.      (i) Explain briefly about different energy auditing methods in use.[8]
(ii) Bring out the important of energy conservation measures in electric energy consuming industry.[8]
5.      (i) Write a short note on the need for energy conservation.[8]
(ii) Discuss briefly about energy auditing.[8]
6.      (i) Discuss the various methods for power factor improvement.[8]
(ii) Define power quality and explain related terms.[8]
7.      A generating station has the following daily loads.
0-6 hrs.4000kW
6-8 hrs.3000kW
8-12 hrs.        8000kW
12-14 hrs.      2000kW
14-18 hrs. 7500kW
18-20 hrs.      3000kW
20-24 hrs.      4500kW
Sketch the load duration curve and determine the load factor. Assume the capacity of the plant 11000kW.[16]
8.      The maximum demand of power plant is 40MW. The capacity factor is 0.5 and the utilisation factor is 0.8. find
(i)                 Load factor.
(ii)               Plant capacity factor.
(iii)             Reserve capacity.      [16]



UNIT-3
PART-A
1.      What are the properties of heating materials?
2.      State the laws of illumination.
3.      Define illumination.
4.      State the advantages of electric heating.
5.      Define the term Lux.
6.      List four merits of electrically produced heat.
7.      Define solid angle.
8.  Distinguish between direct lighting and indirect lighting.
9.  Write short note on infrared heating.
10.  What is the basic principle of induction heating?
11.  What are the different types of welding?
12.  Compare DC welding and AC welding.
13.  What are the modern welding techniques?
14.  What is LASER welding?


PART-B
1.      Draw a neat sketch of AJAX-WYATT induction furnace and explain its working.[16]
2.      (i) Explain the working low pressure mercury vapour lamp with necessary circuit diagram.[8]
(ii) Two street lamps are 20m apart and fitted with a 500 C.P. lamp at a height of 8m above the ground. Find the illumination at a point under the lamp post and midway between the lamps.[8]
3.      (i)Explain the working low pressure mercury vapour lamp with necessary circuit diagram.[8]
(ii) A lamp of 500 C.P. is hung 8*6 m2 at a height of 3m from the floor. Calculate the maximum and minimum illumination produced and mention the places where it occurs. [8]
4.      (i) Explain the working high pressure sodium vapour lamp with necessary circuit diagram.[8]
(ii) A lamp of 500 C.P. is placed at the centre of room (20*10*5) m3. Calculate illumination in each corner of the room. [8]
5.      (i) Derive the expressions for distance ‘d’ and length ‘l’ of a heating element.[8]
(ii) Explain construction and operation principle of welding transformer and its characteristics. [8]
6.      A 30kW, 3 phase 440 V resistance oven is to employ nichrome strip 0.025 cm thick for the three star connected heating elements. If the wire temperature is to be 1100oC and that of charge is to be 700oC. Estimate a suitable width for a strip. Assume resistivity as 1.016*10-6 Ωm, emissivity 0.9 and radiating efficiency 0.5   [16].
7.      A 30kW, 3 phase 400 V oven is to employ nichrome strip 0. 254 mm thick for the three star connected heating elements. If the wire temperature is to be 1100oC and that of charge is to be 700oC. Estimate a suitable width for a strip. Assume conductivity 0.9 and radiating efficiency 0.5. What would be the temperature of the wire if the charge were cold? [16]
8.      A 27kW, 3 phase 400 V resistance oven is to employ nichrome strip 0. 25 mm thick for the three star connected heating elements. If the wire temperature is to be 1000oC and that of charge is to be 600oC. Estimate a suitable width for a strip. Assume resistivity as 101.6*10-8 Ωm, emissivity 0.9 and radiating efficiency 0.5. [16]




UNIT-4
PART-A
1.      Explain the terms dead weight and adhesive weight as applied to a locomotive.
2.      What is scheduled speed of train?
3.      With respect to traction systems, explain the term ‘free running’.
4.      What is voltage level used in traction distribution network?
5.      Define tractive effort.
6.      What is meant by specific energy consumption?
7.      List two merits of series-parallel starting of traction motors.
8.      What are the factors affecting specific energy consumption?

PART-B
1.      (i) Explain different methods of traction motor control. [10]
(ii) Write in detail about mechanics of train movement. [6]
2.      Describe in detail the recent trends available in electric traction system. [16]
3.      (i) Draw a typical speed-time curve and explain its salient features. [8]
(ii) An electric train is accelerated at 1.5 kmphps and is brake 3 kmphps. The train has an average speed of 45 kmphs on track of 1500 metres between stations. Determine the maximum speed and distance travelled before applying brakes. [8]
4.      (i) What are the merits of electric braking? [6]
(ii) Describe briefly about regenerative braking and how this can be applied to D.C. series traction motors. [10]
5.      (i) What are the requirements of an ideal traction system?         [8]
(ii) An electric train has an average speed of 42 kmph on a level track between stops 1400 m apart. It is accelerated at 1.7 kmphs and is braked at 3.3 kmphs. Draw the speed-time curve for the train. [8]
6.      (i) What is specific energy consumption? Enumerate the factors which affect the specific energy consumption of train operating at a given scheduled speed. [8]
(ii) The peripheral speed of railway traction motor cannot be allowed to exceed 42 m/s. if the gear ratio is 16/64, motor armature diameter 40 cm and wheel diameter 88 cm, calculate the limiting valve of the train speed. [8]
7.      A train runs at an average speed of 45 kmph between stations 2.5 km apart. The train accelerated at 2 kmphps and retard at 3 kmphps. Find its crest speed assuming trapezoidal speed time curve. Calculate also the distance travelled before the brakes were applied. [16]
8.      A locomotive accelerates a 350 tonne train up a gradient of 1 in 100 to 0.8 kmphps. Assuming coefficient of adhesion to be 0.25 determine the minimum adhesive weight of the locomotive. Assume train resistant 44.5 Newton/tonne and allow 10% for rotational inertia. [16]


UNIT-5
PART-A
1.      What is load equalization?
2.      Distinguish between individual drive and group drive.
3.      Give the merits and demerits of group drive.
4.      What are the advantages of individual drive?
5.      What type of electrical drive is in (a) Cranes (b) Blowers?
6.      Write the application of DC shunt motor.
7.      Name two types of loads, related to electrical drives.

PART-B
1.      Discuss in detail the classification of electrical drives. [16]
2.      (i) State the important factors on which the selection of electrical drives depends. [8]
(ii) Draw and explain different electrical and mechanical characteristics of various DC motors. [8]
3.      Mention the criteria to be considered while selecting a motor for a specific application. Explain with example. [16]
4.      Discuss various methods of speed control of industrial drives. Write typical examples for each drives. [16]
5.      Discuss in detail the various factors governing the selection of a motor a particular application. Explain with an example. [16]
6.      Discuss the modern methods of speed control of industrial drives. [16]
7.      Explain the different factors to be considered for selection of electric drives for a specific application. [16]
8.      A 200 V, 875 rpm, 150 A D.C motor has an armature resistance of 0.06Ω. It is fed from a single phase fully controlled rectifier with an A.C source voltage of 220 V, 50 Hz. Calculate the firing angle for rated motor torque at 750 rpm. [16]



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