Rungta College of Engineering and

Technology, Bhilai

Department of Electrical
Engineering

Question Bank

B.Tech (Electrical) - 8th Semester

Subject Name – Installation, Maintenance and Testing of Electrical Equipment
Subject Code - D024811(024)

UNIT-I : Overview of Site Management, Electrical Safety

1. What is electrical shocks? Distinguish between primary and secondary shocks. Describe
the causes behind severity behind of shocks.
2. Explain the safety procedure during erection and commissioning phase of project
construction.
3. Explain the safety management inter phase with operation and maintenance.
4. Explain the types earthing used in industry. Explain the pipe earthing with suitable diagram
also list advantages and disadvantages of pipe earthing.
5. Explain
(i) Step potential and touch potential,
(ii) what are the permissible earth resistance for different installation.
6. Describe the various types of maintenance of Electrical Equipment.
7. Define Electrical Shocks. Describe Safety precautions against electrical shocks in HV
installation.
8. Describe safety procedure commissioning phase and operation and maintenance phase.
9. What do you mean by programmed preventive maintenance & also explain scope and
advantage of programmed preventive maintenance.
10. What is Touch potential and Step potential? What are the causes of Electrical shocks?
Explain it.

UNIT-II : Transformer
1. State and explain various causes of trouble and failure of power transformer.
2. Explain the filtering process and filtering plant for transformer oil filtrations.
3. Explain typical maintenance schedule for transformer up to 1000kVA.
4. Explain dry out and various commissioning test on a power transformer.
5. Explain maintenance schedule for attended and un-attended transformers.
6. Explain the procedure of inspection, storage and handling of power transformer.
7. Explain any one procedure of transformer oil filtration with neat sketch.
8. Explain typical maintenance schedule for transformer above to 1000kVA.
9. Write complete maintenance schedule for power transformer.
10. Write important steps in maintenance of power transformer and causes of failure.

UNIT-III : Switchgear, Circuit Breaker

1. Explain various types of commissioning test of outdoor circuit breakers.
2. Explain the principle of vacuum circuit breaker. Explain its construction part also what
are the ratings of vacuum circuit breakers.
3. State and explain maintenance requirements of SF-6 circuit breaker.
4. Explain the principle of air circuit breaker. Explain its construction part also what are the
ratings of air circuit breakers.
5. Explain various trouble shooting of substation equipment.
6. Discuss trouble, causes and remedial action for outdoor circuit breaker in brief.
7. State the difference between type test, routine test and commissioning test of high voltage
A.C. circuit breakers.
8. Describe possible troubles, causes and remedial actions for outdoor circuit breakers.
9. Explain the installation process of switch gears.
10. Explain various steps in maintenance of circuit breaker.

UNIT-IV : Rotating Machines

1. Write the procedure for mechanical maintenance of rotating machines
2. State the various categories of tests of tests on three phase induction motor.
3. Write down the typical maintenance schedule for synchronous motors
4. Explain the trouble, causes, remedies and protection devices during respective abnormal
condition in low voltage induction motor.
5. Explain the followings:
(i) Dry out test of rotating machines,
(ii) Insulation resistance measurement.
6. Explain various steps in the drying out of a generator.
7. Explain the procedure of dismantling of a large rotating machine, dispatching in fully
assembled conditions.
8. Describe the various categories of test of three phase induction motor.
9. Describe the trouble, causes, remedies and protective devices during respective abnormal
condition in low voltage Synchronous Motor.
10. Define cooling. Explain the need of cooling system for Electrical machines. Explain the
principle of cooling systems.

UNIT-V : Hotline Maintenance and Safety against Electric Fire

1. What is hot line maintenance? What are the safety procedure taken during hot line
maintenance?
2. Describe special tools required for hot line maintenance and also explain the work permit
system while working in hot line.
3. Explain the firefighting to extinguish electrical fire. Explain the dry powder fire
extinguisher.
4. Write the principle of hot line maintenance and state the special types of non-conducting
materials used for preparing tools for hot line maintenance.
5. Explain the followings:
(i) Electrical accidents,
(ii) Safety regulation.
6. Explain dry powder type fire-extinguisher for preventing electrical fire.
7. Discuss special types of tools and non-conducting materials used for preparing tools for
hot line maintenance.
8. What are various types of hot line operation? Explain.
9. Explain safety during hot line maintenance and also write different tools which are used in
hot line maintenance.
10. What do you mean by hot line? Write the advantages of hot line maintenance.
Subject Name – EHV AC and DC Transmission
Subject Code - D024831(024)

UNIT - 1 : Fundamentals of EHV AC & DC

Q1. What are the advantages and limitations of HVDC systems?
Q2. Compare EHV AC and HVDC transmission on the basis of technical performance.
Q3. Explain Graetz circuit.
Q4. What are the different types of links used in HVDC system?
Q5. Describe briefly DC transmission system.
Q6. Explain the conduction of thyristor without over-lapping in GRAETZ circuit.
Q7. Write the applications of EHVAC and EHVDC transmission systems.
Q8. Describe power handling capacity.
Q9. Describe the relative merits of AC and DC modes of transmission. What is the need EHV
transmission?
Q10. Describe the problems posed in EHV AC transmission.

UNIT – 2 : Line Compensation and FACTS Devices

Q1. Explain tuned power lines.
Q2. Explain voltage profile along a long EHV AC lines for loaded and unloaded conditions.
Q3. What are the different methods of reactive power compensation in EHV AC lines?
OR
Discuss the series and shunt compensation provided in EHVAC transmission system.
Q4. Explain FACTS (Flexible AC Transmission System) concepts and its applications.
Q5. Explain shunt reactors.
Q6. Explain the problems of extra-long compensated lines.
Q7. Write about compensation of lines.
Q8. What do you mean by voltage profile?
Q9. Explain the term FACTS.
Q10. What do you mean by extra-long compensated lines?
 UNIT – 3 : Travelling Waves and Over Voltages in Transmission Systems
Q1. What do you mean by travelling waves?
Q2. Explain the term “attenuation and distortion” of travelling waves.
Q3. Explain the following terms with travelling waves of transmission line:
a) Reflection coefficient
b) Refraction coefficient
Q4. Explain the protective measures for the control of lighting and switching over voltages in
transmission system.
Q5. Explain attenuation factor related with travelling waves on transmission line.
Q6. Explain over voltages in transmission system.
Q7. What do you mean by switching and temporary over voltage?
Q8. Write about the effect of junction and termination on propagation of travelling waves.
Q9. Explain lightning.
Q10. Write a short note on the shapes of travelling waves.

UNIT – 4 : Components and working of EHV DC System

Q1. Explain Multiterminal DC (MTDC) System.
Q2. Describe about the generation of harmonics and the designing to remove them.
Q3. Discuss various converter faults and their protection scheme in HVDC system.
Q4. Explain reactive power requirement.
OR
On what factors is the reactive power requirement of a converter station depending.
Q5. Describe the various converter control characteristics for series and parallel MTDC
system.
Q6. Write about commutation failure.
Q7. Write about the components of EHV DC system.
Q8. Explain rectifier and inverter valves.
Q9. Write a short note on converter faults.
Q10. Explain the following terms:
a) Filters
b) Ground return
 UNIT – 5 : Control of EHV DC System
Q1. Write about constant control.
Q2. Explain the desired features of control of EHV DC system.
Q3. Explain the parallel operation of HV AC and DC system.
Q4. Write short noted on:
a) Constant ignition angle control
b) Constant extinction angle control
Q5. Name the different types of faults occur in the converter valve.
Q6. Explain the problems associated with parallel operation of HV AC and DC system.
Q7. Write the advantages of parallel operation of HV AC and DC system.
Q8. Explain in detail constants current control.
Q9. Write about the characteristics of control of EHV DC system.
Q10. Write a short note on Faults on EHV DC system.
Subject Name – Electrical Estimation and Costing
Subject Code – D000837(024)

UNIT – 1 : Principles of Estimation and Residential Building Electrification

1. What is estimating? What is the purpose of estimating?
2. Define electrical schedule.
3. Explain the following
a) Contingencies
b) Overhead charge
c) Profit
d) Labour cost
4. What are the essential of estimating and costing?
5. What are the general rules to be followed for internal wiring? Explain.
6. Explain the principal of circuit design in lighting and power circuit.
7. Explain procedure for designing the circuit and deciding the number of circuit method of
drawing single line diagram
8. Discuss important point to be considered while determining the size of conductor for internal
wiring.
9. Explain selection of rating of main switch distribution board.
10. Draw a neat diagram showing the position of switchboard, distribution board and accessories
with necessary connection in looping system of a hall of 16 m x 6m x 4.5 m height. The hall
is to be fitted with fan and light points. Make your own assumption for a number of light and
fan point and other missing data.

UNIT – 2 : Electrification of Commercial Installation

1. What are the properties of a good conducting material?
2. Where is the flexible conduit used?
3. What is the earthing in electrical installation & earthing and grounding?
4. Explain the bus bar and bus bar chamber.
5. Design the consideration of electrical installation system for commercial building.
6. Explain in this detail, estimating and costing of commercial solution.
7. Compare various type of electrical wiring system for domestic installation.
8. How will you select the type of wire for electrification of commercial building? Explain
briefly about layout and wiring system?
9. What is the main point to be checked in an inspection of an electrical installation? Also
explain the various test required to be earthing.
10. What are the different method of earthing?

UNIT – 3 : Service Connection, Power Circuits, Inspection and Testing of Installation

1. Discuss the qualities of a good conductor?
2. What is service connection? Explain the power circuit.
3. Explain the concept and method of installation of service connection.
4. How to determine the rating of cable, rating of fuse, size of conduit?
5. Explain various types of service connection and their feature in detail.
6. Explain the various test to be performed on the on new wiring installation wiring.
7. What are the important consideration regarding motor installation wiring?
8. Explain the various component of overhead head line.
9. Write short notes about underground and overhead service connection.
10. Explain method of installation of service connection.

UNIT – 4 : Design of Overhead Transmission and Distribution Lines

1. What is the main component of overhead lines?
2. Discuss the use of lighting arrester. Define the insulator and enlist there type with example.
3. Enlist the main component of overhead lines.
4. What is guarding of overhead lines?
5. Describe the erection, repairing and jointing of conductor.
6. Discuss the following factor designing of a transmission line
a) Span, sag and tension
b) Clearance from the ground &
c) Type of insulators
7. Explain the transmission and distribution system.
8. A pole for an overhead 11 kV 3 phase 50 Hz Line is required to be earthed and a stay is to
be provided. Prepare a list of material required and estimated the cost
9. Describe the qualities of conductor material for overhead lines
10. Which factor are governing for factor governing height of pole, conductor material, cross
arms, pole bracket and clamp?

UNIT - 5 : Design and Estimation of Substation

1. Define substation. What are the different substation component? Explain.
2. Define air-break switch
3. Write a list of key elements of a substation. Also provide their graphical symbols.
4. What are the different insulation employed in substation?
5. Explain the selection and location of site for substation.
6. What are the equipment used for installation for substation?
7. Draw the key diagram for a 33 kv substation and explain
8. Differential between grid substation and town substation.
9. Estimate the quality of material and cost for the a 250 KVA pole mounted substation
10. Discuss the classification of substation in numerous ways