Code No: R05211401
R05
Set No. 2
in
II B.Tech I Semester Examinations,December 2011 THERMAL SCIENCE Common to Mechatronics, Production Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
or
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1. A piston and cylinder machine contains a fluid system, which passes through a complete cycle of four process. During a cycle, the sum of all heat transfer is - 150 KJ and the system completes 100 cycles per minute. Complete the following table and calculate the net rate of work output. Process Q (kJ/min) W (kJ/min) dU(kJ/min) 1-2 0 2150 ————— 2-3 20,000 0 —————– 3-4 -2,000 ———36,000 4-1 —————————————[16] 2. (a) How much work can be saved with multistage compression with inter cooling in a gas turbine power plant? Explain.
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(b) A gas turbine plant receives air at 1 bar and 293 K. The maximum temperature is 1100 K. Find thermal efficiency and work ratio if the pressure ratio is 4 and polytropic index is 1.4. [8+8] 3. (a) State and prove second law of thermodynamics (b) Define Clausius inequality and prove it (c) A heat engine receives 100 Kw of heat at constant temperature of 2850 C. The heat is rejected at 50 C. [5+5+6] The possible heat rejected are
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i. 840KW ii. 492 kw iii. 300Kw comment on the result.
Aj
4. (a) How two stroke S.I.engine indicator diagram differs from that of four stroke cycle engine . (b) Explain the following terms. i. ii. iii. iv.
Flywheel Governor Connecting rod piston
[8+8]
5. (a) Explain about the re-heating and regeneration of a steam cycle with help of neat diagrams?
1
Code No: R05211401
R05
Set No. 2
(b) Obtain an expression for the efficiency of Joule’s cycle in terms of pressure ratio. [8+8]
in
6. A cycle consists of three processes. The first is an expansion that is carried out according to the relation PV = constant from an initial condition of 500 KPa and 0.2 m3 to a final pressure of 250 KPa. The second process is a constant pressure compression that returns the gas to the volume that it had at the beginning of the first process. The cycle is closed with a constant volume process that returns the to its state at the beginning of first process. Sketch the cycle on P-V coordinates, and calculate the net work of the cycle. [16]
ld .
7. (a) Represent Otto Cycle on P-V and T-S diagram. Analyze the cycle and deduce an expression for air standard efficiency in terms of compression ratio?
(b) An oil engine working on the dual combustion cycle has a compression ratio 14 and the explosion ratio obtained from an indicator card is 1.4. If the cut off occur at 6 percent of stroke. Find the ideal efficiency take for air γ = 1.4 [6+10]
or
8. (a) Compare the air swirl in C.I. Engine with turbulence in S.I. Engine.
(b) Why the second stage of combustion in C.I. Engine is called uncontrolled combustion. Explain. [8+8]
Aj
nt
uW
?????
2
Code No: R05211401
R05
Set No. 4
in
II B.Tech I Semester Examinations,December 2011 THERMAL SCIENCE Common to Mechatronics, Production Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
or
ld .
1. A piston and cylinder machine contains a fluid system, which passes through a complete cycle of four process. During a cycle, the sum of all heat transfer is - 150 KJ and the system completes 100 cycles per minute. Complete the following table and calculate the net rate of work output. Process Q (kJ/min) W (kJ/min) dU(kJ/min) 1-2 0 2150 ————— 2-3 20,000 0 —————– 3-4 -2,000 ———36,000 4-1 —————————————[16] 2. (a) Represent Otto Cycle on P-V and T-S diagram. Analyze the cycle and deduce an expression for air standard efficiency in terms of compression ratio?
uW
(b) An oil engine working on the dual combustion cycle has a compression ratio 14 and the explosion ratio obtained from an indicator card is 1.4. If the cut off occur at 6 percent of stroke. Find the ideal efficiency take for air γ = 1.4 [6+10] 3. (a) Explain about the re-heating and regeneration of a steam cycle with help of neat diagrams? (b) Obtain an expression for the efficiency of Joule’s cycle in terms of pressure ratio. [8+8]
nt
4. (a) How much work can be saved with multistage compression with inter cooling in a gas turbine power plant? Explain.
Aj
(b) A gas turbine plant receives air at 1 bar and 293 K. The maximum temperature is 1100 K. Find thermal efficiency and work ratio if the pressure ratio is 4 and polytropic index is 1.4. [8+8]
5. A cycle consists of three processes. The first is an expansion that is carried out according to the relation PV = constant from an initial condition of 500 KPa and 0.2 m3 to a final pressure of 250 KPa. The second process is a constant pressure compression that returns the gas to the volume that it had at the beginning of the first process. The cycle is closed with a constant volume process that returns the to its state at the beginning of first process. Sketch the cycle on P-V coordinates, and calculate the net work of the cycle. [16]
6. (a) How two stroke S.I.engine indicator diagram differs from that of four stroke cycle engine . 3
Code No: R05211401
R05
Set No. 4
(b) Explain the following terms. Flywheel Governor Connecting rod piston
[8+8]
7. (a) State and prove second law of thermodynamics (b) Define Clausius inequality and prove it
in
i. ii. iii. iv.
i. 840KW ii. 492 kw iii. 300Kw comment on the result.
ld .
(c) A heat engine receives 100 Kw of heat at constant temperature of 2850 C. The heat is rejected at 50 C. [5+5+6] The possible heat rejected are
or
8. (a) Compare the air swirl in C.I. Engine with turbulence in S.I. Engine.
(b) Why the second stage of combustion in C.I. Engine is called uncontrolled combustion. Explain. [8+8]
Aj
nt
uW
?????
4
Code No: R05211401
R05
Set No. 1
in
II B.Tech I Semester Examinations,December 2011 THERMAL SCIENCE Common to Mechatronics, Production Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) How much work can be saved with multistage compression with inter cooling in a gas turbine power plant? Explain.
ld .
(b) A gas turbine plant receives air at 1 bar and 293 K. The maximum temperature is 1100 K. Find thermal efficiency and work ratio if the pressure ratio is 4 and polytropic index is 1.4. [8+8] 2. (a) Compare the air swirl in C.I. Engine with turbulence in S.I. Engine.
or
(b) Why the second stage of combustion in C.I. Engine is called uncontrolled combustion. Explain. [8+8] 3. (a) Explain about the re-heating and regeneration of a steam cycle with help of neat diagrams?
uW
(b) Obtain an expression for the efficiency of Joule’s cycle in terms of pressure ratio. [8+8] 4. (a) Represent Otto Cycle on P-V and T-S diagram. Analyze the cycle and deduce an expression for air standard efficiency in terms of compression ratio? (b) An oil engine working on the dual combustion cycle has a compression ratio 14 and the explosion ratio obtained from an indicator card is 1.4. If the cut off occur at 6 percent of stroke. Find the ideal efficiency take for air γ = 1.4 [6+10]
Aj
nt
5. A cycle consists of three processes. The first is an expansion that is carried out according to the relation PV = constant from an initial condition of 500 KPa and 0.2 m3 to a final pressure of 250 KPa. The second process is a constant pressure compression that returns the gas to the volume that it had at the beginning of the first process. The cycle is closed with a constant volume process that returns the to its state at the beginning of first process. Sketch the cycle on P-V coordinates, and calculate the net work of the cycle. [16]
6. A piston and cylinder machine contains a fluid system, which passes through a complete cycle of four process. During a cycle, the sum of all heat transfer is - 150 KJ and the system completes 100 cycles per minute. Complete the following table and calculate the net rate of work output. Process Q (kJ/min) W (kJ/min) dU(kJ/min) 1-2 0 2150 ————— 2-3 20,000 0 —————– 3-4 -2,000 ———36,000 4-1 —————————————[16] 5
Code No: R05211401
R05
Set No. 1
7. (a) State and prove second law of thermodynamics (b) Define Clausius inequality and prove it (c) A heat engine receives 100 Kw of heat at constant temperature of 2850 C. The heat is rejected at 50 C. [5+5+6] The possible heat rejected are
in
i. 840KW ii. 492 kw iii. 300Kw comment on the result.
ld .
8. (a) How two stroke S.I.engine indicator diagram differs from that of four stroke cycle engine . i. ii. iii. iv.
Flywheel Governor Connecting rod piston
or
(b) Explain the following terms.
Aj
nt
uW
?????
6
[8+8]
Code No: R05211401
R05
Set No. 3
in
II B.Tech I Semester Examinations,December 2011 THERMAL SCIENCE Common to Mechatronics, Production Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Represent Otto Cycle on P-V and T-S diagram. Analyze the cycle and deduce an expression for air standard efficiency in terms of compression ratio?
ld .
(b) An oil engine working on the dual combustion cycle has a compression ratio 14 and the explosion ratio obtained from an indicator card is 1.4. If the cut off occur at 6 percent of stroke. Find the ideal efficiency take for air γ = 1.4 [6+10]
or
2. (a) Explain about the re-heating and regeneration of a steam cycle with help of neat diagrams? (b) Obtain an expression for the efficiency of Joule’s cycle in terms of pressure ratio. [8+8]
uW
3. A piston and cylinder machine contains a fluid system, which passes through a complete cycle of four process. During a cycle, the sum of all heat transfer is - 150 KJ and the system completes 100 cycles per minute. Complete the following table and calculate the net rate of work output. Process Q (kJ/min) W (kJ/min) dU(kJ/min) 1-2 0 2150 ————— 2-3 20,000 0 —————– 3-4 -2,000 ———36,000 4-1 —————————————[16]
nt
4. (a) How two stroke S.I.engine indicator diagram differs from that of four stroke cycle engine . (b) Explain the following terms. Flywheel Governor Connecting rod piston
Aj
i. ii. iii. iv.
[8+8]
5. A cycle consists of three processes. The first is an expansion that is carried out according to the relation PV = constant from an initial condition of 500 KPa and 0.2 m3 to a final pressure of 250 KPa. The second process is a constant pressure compression that returns the gas to the volume that it had at the beginning of the first process. The cycle is closed with a constant volume process that returns the to its state at the beginning of first process. Sketch the cycle on P-V coordinates, and calculate the net work of the cycle. [16] 7
Code No: R05211401
R05
Set No. 3
6. (a) Compare the air swirl in C.I. Engine with turbulence in S.I. Engine. (b) Why the second stage of combustion in C.I. Engine is called uncontrolled combustion. Explain. [8+8] 7. (a) How much work can be saved with multistage compression with inter cooling in a gas turbine power plant? Explain.
(b) Define Clausius inequality and prove it
ld .
8. (a) State and prove second law of thermodynamics
in
(b) A gas turbine plant receives air at 1 bar and 293 K. The maximum temperature is 1100 K. Find thermal efficiency and work ratio if the pressure ratio is 4 and polytropic index is 1.4. [8+8]
(c) A heat engine receives 100 Kw of heat at constant temperature of 2850 C. The heat is rejected at 50 C. [5+5+6] The possible heat rejected are
or
i. 840KW ii. 492 kw iii. 300Kw comment on the result.
Aj
nt
uW
?????
8
