GTU previous question papers -BE- Sem-Vth -Conventional Power Engineering -Nov/Dec-2011

GTU previous question papers


BE SEM-V Examination-Nov/Dec.-2011

Subject code: 151906 

Subject Name: Conventional Power Engineering



1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1 (a) Describe a modern coal based thermal power plant , giving its layout,                           

Inputs , outputs, various circuits and systems.

(b) Explain the ideal and actual Brayton cycles withT-S diagrams.                           

Derive expressions for air standard efficiencies for both cases.

Q.2 (a) A gas turbine power plant operates between temperatures 15 C and                           

1100 C . Calculate the following: (i) The optimum pressure ratio for

the cycle for maximum power output, (ii) Compressor work, Turbine

work, Shaft work and Work Ratio, and (iii) Plant efficiency.

Take for air , Cp=1.005 kJ/kg-K and k = Cp / Cv = 1.4.

(b) Explain the processes in simple Rankine Cycle on p-v and T- S                           

diagrams and derive an expression for thermal efficiency.

Name the significant parameters to improve thermal efficiency

of the power plant.?


(b) Explain the principle of conversion of nuclear energy into electrical                           

energy in atomic power plant? Also, compare the merits and demerits

of nuclear power plants with the coal-based thermal power plants.

Q.3 (a) What is governing of water turbines? Discuss briefly methods used                           

in the governing of Pelton turbines.

(b) What is compounding of steam turbines? Describe pressure-velocity                           

compounding of steam turbines.


Q.3 (a) List different systems used in the working of a diesel power plant.                           

Describe with diagrams its (i) Lubrication System and (ii) Cooling System

(b) Give classification of hydraulic turbines. Describe working of a Kaplan                           

turbine with diagrams, showing its components and velocity triangles.

Q.4 (a) Describe the significance of load curves in planning and determining the                           

sizes of Units in power plants. Define base load, intermediate load and peak

loads, with load curves.

(b) Explain the working of open-cycle and closed – cycle gas turbine power                           

plants with suitable diagrams. Which fuels can be used in these plants?


Q.4 (a) Describe CANDU type nuclear reactor with the help of suitable diagram.                           

Give names of various nuclear fuels used in nuclear power plants.

(b) What are classifications of steam turbines ? Explain the working of                           

Curtis type impulse turbine with suitable velocity diagrams.

Q.5 (a) A power plant has following annual factors:                           

(i) Utilisation Factor = 0. 60, (ii ) Capacity factor = 0.50, (iii) Load factor =0.70

It has peak load of 20000 kW.

Find : (i) Annual energy generation, (ii) Reserve capacity, and ( iii) Time period

the plant was utilized in the year.

(b) What are advantages and disadvantages of diesel power plants over other                           

types? Describe working of a diesel power plant with suitable diagrams.


(a) Define “degree of reaction” of steam turbines. Derive an expression for                           

calculating degree of reaction in terms of velocities. Give a brief comparison

of impulse and reaction steam turbines?

(b) Suppose you are Minister for Power in the Government of Gujarat.                           

Discuss your plans to increase electric power generation in the State,

taking into account the resources available within the State.


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