Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2171910 Power Plant Engineering Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2171910 Date: 06/12/2018
Subject Name: Power Plant Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of Mollier chart and steam table is permissible.
Q.1 (a) Explain the function of following equipments in a thermal power plant :
Reheater, control room and air-preheater.
03
(b) Explain the principle of fluidized bed combustion. 04
(c) Name two indirectly heated high pressure boilers and explain construction and
working of any one of them.
07
Q.2 (a) What are the requirements of a good ash handling plant. 03
(b) Describe the unit pulverized coal handling system. 04
(c) Explain cyclone burner with neat diagram. 07
OR
(c) Write a short note on electrostatic precipitator. 07
Q.3 (a) Derive the expression for the velocity in terms of enthalpy drop for a flow
through the nozzle.
03
(b) With a neat diagram explain balanced draught. Also explain pressure
distribution in balanced draught.
04
(c)
Steam at a pressure of 15 bar and dryness fraction 0.95 is discharged through a
convergent-divergent nozzle to a back pressure of 0.5 bar. The mass flow rate is
9 kg/kwhr. If the power developed is 200 kW, determine :
(i) Throat pressure
(ii) Number of nozzles required if each nozzle has a throat of
rectangular cross-section of 4 mm ? 8 mm.
(iii) If 10% of overall isentropic enthalpy drop reheats by friction
the steam in divergent portion, find the cross-section of the
exit rectangle
07
OR
Q.3 (a) Explain the principle of operation of steam turbine. 03
(b) Differentiate between forced and induced draft. 04
(c) A single row impulse turbine develops 135 kW at a blade speed of 180 m/sec
using 2 kg of steam per second. Steam leaves the nozzle at 400 m/sec. Velocity
coefficient of the blades is 0.9. Steam leaves the turbine blades axially.
Determine
(i) Nozzle angle
(ii) Blade angles at entry and exit assuming no shock.
07
Q.4 (a) Explain the working principle of plain Labyrinth glands used in steam turbine. 03
(b) Explain downflow surface condenser. 04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2171910 Date: 06/12/2018
Subject Name: Power Plant Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Use of Mollier chart and steam table is permissible.
Q.1 (a) Explain the function of following equipments in a thermal power plant :
Reheater, control room and air-preheater.
03
(b) Explain the principle of fluidized bed combustion. 04
(c) Name two indirectly heated high pressure boilers and explain construction and
working of any one of them.
07
Q.2 (a) What are the requirements of a good ash handling plant. 03
(b) Describe the unit pulverized coal handling system. 04
(c) Explain cyclone burner with neat diagram. 07
OR
(c) Write a short note on electrostatic precipitator. 07
Q.3 (a) Derive the expression for the velocity in terms of enthalpy drop for a flow
through the nozzle.
03
(b) With a neat diagram explain balanced draught. Also explain pressure
distribution in balanced draught.
04
(c)
Steam at a pressure of 15 bar and dryness fraction 0.95 is discharged through a
convergent-divergent nozzle to a back pressure of 0.5 bar. The mass flow rate is
9 kg/kwhr. If the power developed is 200 kW, determine :
(i) Throat pressure
(ii) Number of nozzles required if each nozzle has a throat of
rectangular cross-section of 4 mm ? 8 mm.
(iii) If 10% of overall isentropic enthalpy drop reheats by friction
the steam in divergent portion, find the cross-section of the
exit rectangle
07
OR
Q.3 (a) Explain the principle of operation of steam turbine. 03
(b) Differentiate between forced and induced draft. 04
(c) A single row impulse turbine develops 135 kW at a blade speed of 180 m/sec
using 2 kg of steam per second. Steam leaves the nozzle at 400 m/sec. Velocity
coefficient of the blades is 0.9. Steam leaves the turbine blades axially.
Determine
(i) Nozzle angle
(ii) Blade angles at entry and exit assuming no shock.
07
Q.4 (a) Explain the working principle of plain Labyrinth glands used in steam turbine. 03
(b) Explain downflow surface condenser. 04
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2
(c) Write a short note on Zeolite ion exchange process.
07
OR
Q.4 (a) What are the sources of air leakage in a condenser ? 03
(b) Write a note on fast breeder reactor. 04
(c) Differentiate between nuclear fusion and fission. 07
Q.5 (a) What is the need of cooling gas turbine blades ? Explain transpiration cooling
of gas turbine blades.
03
(b) What do you mean by thrust augmentation ? State the methods for thrust
augmentation in a turbojet engine and discuss any one of them.
04
(c) A gas turbine operates on Brayton cycle. The temperature range is 1050 K and
288 K. Find pressure ratio for maximum power output. Also determine thermal
efficiency, work ratio and power output, if the mass flow rate of air is 20 kg/sec.
Take Cp = 1.005 kJ/kg K and ? = 1.4 for compression and expansion process.
07
OR
Q.5 (a) State classification of rocket engines. 03
(b) State the advantages of combined gas and steam power plant. 04
(c) What do you understand by the term tariff ? State the various methods for
calculation of tariff and discuss any three of them.
07
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This post was last modified on 20 February 2020