Name of the University : Jadavpur University
Department : Power Engineering
Degree : B.E
Subject Name : Power Plant Operation And Maintenance-II
Sem : II
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/5518-POWER%20PLANT%20OPERATION%20AND%20MAINTENANCE-II_Seme2_2005.pdf
Jadavpur Power Plant Operation Question Paper
B. Power Engg. Final Examination, 2005 :
( 2nd Semester )
Time : Three hour
Full Marks : 100
Related : Jadavpur University Power Plant Layout & Material Handling B.E Question Paper : www.pdfquestion.in/5517.html
Model Questions
Answer any five questions. :
1. (a) Discuss in detail the role played by workshops and stores in formulating maintenance strategy by the concerned department. 10
(b) State how the temperature of the electrical apparatus and voltage rating of the meggerset affects the measurement of I.R. of the apparatus. 10
2. (a) Mention the important monitoring activities carried out in alternators through extensive instrumentation built into the machine. 10
(b) What are the reasons behind development of generator shaft current ? Why is it harmful ? Discuss the remedial measures. 10
3. (a) Describe the two types of protection testing normally undertaken in respect of high voltage switchgears. 10
(b) Elaborate the procedure adopted for calibration of ‘winding tenperature indicator’ in a transformer. 10
4. (a) State the parts which are to be inspected and attended while overhauling a motor. 10
(b) What are the reasons behind overheating of induction motors ? 5
(c) Discuss the co-ordination of motor lockedrotor protection with its starting time and cold/hot withstand time. 5
5. (a) What are the modes of changeover of auxiliary power supply system during start-up and shut-down of the plant. Discuss how that is effected. 15
(b) What is the role of a synchro-check relay while the changeover is in automatic mode ? 5
6. (a) Describe brushless excitation system of generators. 15
(b) How is diode failure in brushless excitation system detected ? 5
7. (a) What is meant by synchronising supersynchionously and sub-synchronously. Discuss their relevance vis-a-vis different application as regards synchronisation of steam-turbine or gas-turbine generators. 15
(b) Determine the slip frequency band for a load pick-up between 2% and 6%, with a speed droop of 5% and a system frequency of 50 Hz. 5
8. Write short notes on any four of the following :
(i) Buchholz relay in a transformer and its testing.
(ii) Power plant earthing system.
(iii) Follow-up circuits in AVR.
(iv) Stabilising winding in Y-Y transformer.
(v) Tuning of AVR.
(vi) Generator rotor earth fault protection.
(vii) Polarisation Index, 5×4
Syllabus
Pe/T/421 Power Plant Operation & Maintenance Management Syllabus :
Operation of feed pumps, condensate pumps and feed water heaters, Operation of FD, ID and PA fans, coal feeders and mills, coal, oil and gas burners. Bringing a boiler on load, Cold and Hot start-up and shutdown of turbogenerators, normal and emergency operation of powerplants.
Automatic voltage and frequency control, VAR-compensation during peak and off-peak hours and the voltage profile, Generator capability curve. Relay setting operation, Setting of under-voltage and under-frequency relays, Voltage collapse due to cascaded tripping and emergency measures, Automatic load-shedding, Resynchronization and Self-synchronization, oad scheduling and load dispatch.
Maintenance organization, routine and emergency maintenance of boilers, turbines and auxiliaries, like pumps, heat exchangers, mechanical shaft seals, ejectors etc. Economic operation of a plant, Optimization procedure for boiler and turbine operation, Maintenance records. Operation and maintenance of captive power plants, Maintenance of generators, transformers, Main and Transfer buses, Relay and circuit breakers and the drives, charging and discharging of storage cells and their maintenance.
PE/T/325 Power Plant Instrumentation And Control Syllabus :
Introduction – overview of power plant control loops, control loops, complex control schemes, PID controller, multivariable control. Instrumentation- General concepts and objectives, instrumentation of complex systems, different types of power plants and role of instrumentation in controlling and monitoring the power production, optimization and adaptation, Thermal power plant instrumentation, controlling and monitoring of boilers, turbines and generators, Transformers, condensers and power plant auxiliaries.
Furnace draft and temperature control, combustion control, drum and feed water level control, emergencies and actions, alarm and annunciation, safety, interlock and supervisory schemes, salient features of instrumentation of hydro-electric, nuclear and nonconventional power plants, Monitoring generation and load flow, plant efficiency, Excitation control and temperature profile, DCS, Fire Detection and Protection system, Plant Communication system. Study of P&I Diagram and presentation of Instrumentationon P&ID.