DIPLOMA IN ELECTRICAL AND ELECTRONICS ENGINEERING
SUBJECT CODE : 23051
SEMESTER : V
SEMESTER
SUBJECT TITLE :
POWER SYSTEM-1
STAFF-IN-CHARGE: N.SURESH KUMAR
IMPORTANT
QUESTIONS
UNIT-I
PART-A
1.
State any two advantage of thermal power
plant.-OCT 2013
2.
List out the different renewable energy
sources. .-OCT 2013
3.
What is grid system? .-OCT 2013
4.
Define diversity factor. .-OCT 2013
5.
What Is The Electrical Machine Used In
Winding Mill? - APRIL 2014
6.
Which Type Of Boilers Is Used In Thermal
Power Plant? - APRIL 2014
7.
Define Plant Capacity Factor. - APRIL 2014
8.
Mention The Applications Of Fuel Cells. -
APRIL 2014
9.
What
are the conventional sources to general Electrical power?
10.
What
is the purpose of surge tank?
11.
Give
any two disadvantages of hydroelectric power plant.
12.
What
is meant by stand-alone system?
13.
Give
the renewable energy sources for generating Electrical power.
14.
What
is meant by grid?
15.
What
is meant by Tariff?
16.
State Kelvin’s law
PART-B
1. What
Are The Point To Be Consider For The Selection Of Site For A Thermal Power
State Its Merits And Demerits.(12)-OCT 2013
2. Draw
The Schematic Diagram Of A Nuclear Power Plant And Explain Its Working. (12)-OCT
2013
3.
Explain The Renewable Energy Source Which
Are Suitable For Direct Electrical Conversion (12) -APRIL 2014
4.
Write Notes On A)Pumped Storage Scheme B)
Load Despatch Centre (12)-APRIL 2014
5.
List and explain the advantages of
interconnected system.(12)
6.
Draw and explain the schematic
arrangement of thermal power plant. (12)
7.
Draw
and explain the schematic diagram of nuclear power plant. (12)
8.
A
generating station has a maximum demand of 50 mw. Given the following data,
calculate the cost per unit delivered. Capital cost – Rs. 95x105. Annual cost
of fuel and oil Rs. 9x105 Taxes, wages and salaries – Rs. 6 x 105 Rate of
Interest and depreciation – 10% Annual Load factor -50%. (12)
UNIT-II
PART-A
1.
State Kelvin’s Law. .-OCT 2013
2.
What Is Ferranti Effect? .-OCT 2013
3.
What Are The Merits Of ACSR Conductor
Material Used For Transmission? .-OCT 2013
4.
Why The Transmission Line Conductors Are
Interchanged At Regular Interval Along The Line? .-OCT 2013
5.
Mention The Type Of Supports Used In Oh
Line. - APRIL 2014
6.
Classify Oh Transmission Line- APRIL 2014
7.
Mention Any Two Advantages Of Dc
Transmission Over Ac Transmission- APRIL 2014
8.
What Do You Understand By The Term Dc Link?
- APRIL 2014
9.
List
the elements of a transmission line.
10.
Give
any two limitations of Kelvin’s law.
11.
Give
the types of line supports.
12.
Write
the span lengths allowable for R.C.C. Poles.
13.
Give
the properties of conductor materials used for O.H. transmission
14.
What
is ferranti effect?
15.
Give
any two advantages of suspension Insulators.
16.
What
is string efficiency?
PART-B
1. Draw The Layout
Of Ac Power Supply Scheme And Explain The Various Stage. (12)-OCT 2013
2. Explain The
Following Line Supports With Merits And Demerits (I) Steel Tubular Poles (Ii)
Rcc Poles And (Iii) Steel Tower. (12)-OCT 2013
3.
Dicuss In Detail About A) Ferranti Effect
B)Corona (12)-APRIL 2014
4.
An Over Head 3 Phase Transmission Line
Delivers 5000 Kw At 22kv At 0.8 Pf Lagging. The Resistance And Reactance Of
Each Conductor Is 4 Ohm And 6 Ohm Respectively. Determine 1) Percentage
Regulation % 2) Transmission Efficiency (12)-APRIL 2014
5.
Derive
an expression for the sag in a transmission line conductor suspended between
two supports at the same level. (12)
6.
Explain
how to find the regulation and efficiency of short transmission lines. (12)
7.
State
and explain Kelvin’s law. (12)
8. Compare constant
current and constant voltage HVDC systems. (12)
UNIT-III
PART-A
1.
What Are The Materials Used For
Manufacturing Insulator? .-OCT 2013
2.
Define String Efficiency. .-OCT 2013
3.
How Cables Are Classified According To
Voltage Range? .-OCT 2013
4.
What Is Mean By Grading Of Cables? .-OCT
2013
5.
Mention The Materials Suitable For Line
Insulator. - APRIL 2014
6.
What Are All The Tests To The Conductor On
Line Insulators- APRIL 2014
7.
Mention The Requirements Of UG Cable- APRIL
2014
8.
Mention The Type Of Grading Of Cables-
APRIL 2014
9.
What
is skin effect?
10.
Name
the types of Insulators.
11.
Give
any four reasons for failure of Insulators.
12. Give
any three properties of Insulating materials used in cables.
13.
Name
the types of pressure cable.
14.
Name
the types of grading of cables.
15.
What
is symmetrical faults in power system?
16. What
is meant by Recovery voltage?
PART-B
1. An Insulator
String Consist Of 3 Units Each Having Safe Working Voltage Of 15kv. The Ratio
Of Self Capacitance Of Each Unit Is 8:1. Find The Maximum Safe Working Voltage
Of The String Efficiency. (12)-OCT 2013
2. Explain With The
Neat Sketch The Construction Of A Three Conductor UG Cable With Description On
Various Parts. (12)-OCT 2013
3.
Discuss In Detail About The Properties And
Causes Of Failures Of Insulators(12)-APRIL 2014
4.
With Test Circuit Diagram Explain Murray
Loop Test (12)-APRIL 2014
5.
Bring
out the reasons for the failure of Insulator. (6)
6.
Explain
any two methods to improve the string efficiency. (6)
7.
Explain
the construction of belted cable. (6)
8. Explain
capacitance grading of U.G. Cables. (6)
9.
Explain
the various methods of testing of insulators. (12)
10. Explain
different types of laying of cables. (12)
UNIT-IV
PART-A
1.
What Is Function Of Switchgear? .-OCT 2013
2.
How The Circuit Breakers Are Classified? .-OCT
2013
3.
What Are The Requirements Of Fuse? .-OCT
2013
4.
Mention Any Two Causes For Over Voltage. .-OCT
2013
5.
Define The Term Current Chopping- APRIL
2014
6.
Mention The Types Of Ac Circuit Breakers -
APRIL 2014
7.
What Is The Problem In Braking Dc Voltage-
APRIL 2014
8.
Mention The Types Of Lightning Arresters-
APRIL 2014
9.
Name
the methods of laying underground cable
10.
What
is switch gear?
11.
What
are the factors responsible for the maintenance of arc between the contacts?
12.
Give
any three advantages of SF6 circuit breaker.
13.
What
is short time rating?
14.
Write
the desirable characteristics of fuse.
15.
List
the fundamental requirements of relay
16.
What
is meant by backup protection?
PART-B
1. Explain The
Construction And Working Of Cross Blast Air Circuit Breaker. State Its Merits And Demerits. (12)-OCT 2013
2. Explain With A
Neat Sketch The Working Of HRC Fuse With An Tripping Device. (12)-OCT2013
3.
With Neet Diagram Explain The Functionality
Of Vacuum CB (12)-APRIL 2014
4.
Write Note On 1) Hrc Cartridge Fuse 2)
Protection Against Lightning(12)-APRIL 2014
5.
Explain
the construction and working principle of sulphur hexa fluoride. (6)
6.
circuit
breaker and state its advantages. (6)
7. Explain
the construction and working of HRC fuse with tripping device. (12)
8.
Explain
the construction and working principle of vacuum Circuit breaker. (12)
9.
Explain
the construction and working of expulsion type lightning arrester. (12)
UNIT-V
PART-A
1.
What Are Basic Requirement Of A Fuse? .-OCT
2013
2.
Mention The Two Types Of Differential
Relay. .-OCT 2013
3.
Where Distance Relay Are Used? .-OCT 2013
4.
What Is The Function Of Earthing
Transformer? .-OCT 2013
5.
Classify The Relays Based On Operating Time-
APRIL 2014
6.
Mention The Advantages Of Static Relay -
APRIL 2014
7.
What Is The Uses Of Mho Relay - APRIL 2014
8.
Mention The Types Of Neutral Grounding-APRIL
2014
9.
What
is the function of a fuse?
10.
What
is static relay?
11.
What
is meant by Primary protection?
12.
What is meant by grounding?
13.
List
the types of Neutral grounding
14.
Give
the types of static relays.
15.
List
the effects of ungrounded Neutral.
16.
What
is static relay?
PART-B
1. Explain With A
Neat Sketch The Construction, Working And Application Of Directional Over
Current Relay. (12)-OCT 2013- APRIL 2014
2. Explain
The Following Of Grounding: (I) Resonant Grounding (Ii) System Grounding. (12)-OCT 2013
3.
Explain The Operation Of Differential Relay
With Simple Sketch (12)-APRIL 2014
4.
Explain
the construction and working principle of earth leakage relay. (12)
5. With necessary
diagram explain resistance grounding. (12)
6.
Explain
the construction and working principle of Earthing transformer. (12)
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