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?
- What
is thermal efficiency?
- Name
the fuels used for gas turbines?
- What
are the types of wind mills?
- What
is the power generating station?
- What
is the steam condenser?
- 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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