Applied Thermodynamics - II, Question Paper of Mechanical Engineering 4th Semester, Download Question Paper Applied Thermodynamics 6

Roll No.

Total No. of Questions: 09

B. Tech. (ME) (Sem.-4th)

APPLIED THERMODYNAMICS - I

Subject Code: BTME-404

Paper ID: [A1214]

Time: 3 Hrs.

INSTRUCTION TO CANDIDATES :

1. SECTION-A is COMPULSORY consisting of TEN questions carrying

TWO marks each.

2. SECTION-B contains FIVE questions carrying FIVE marks each and

students has to attempt any FOUR questions.

3. SECTION-C contains THREE questions carrying TEN marks each and

students has to attempt any TWO questions.

SECTION-A

l. Answer briefly :

(a) What are the advantages of multi-stage compression?

(b) State at least four applications of compressed air.

(c) List the positive displacement type rotary compressors.

(d) Write the steady flow energy equation & explain various terms?

(e) Explain the terms pre-whirl & slip factor.

(f) Explain the term surging used in centrifugal compressors.

(g) What is stalling in case of axial flow compressor?

(h) List the different components of axial flow compressor.

(i) What is semi-closed gas turbine ?

(j) Name the two solid propellants used in rockets.

SECTION-B

2. Show that the optimum intermediate pressure of a two-stage compressor

for minimum work is the geometric mean of the suction & discharge

pressures.

3. Define degree of reaction as applied to axial flow compressor and show

that the blades are symmetrical for 50% reaction.

4. Explain the function of impeller and diffuser in the centrifugal compressor.

5. Discuss the methods of improving the work ratio, specific, output & cycle

thermal efficiency by employing multi-stage system gas turbines with

intercooling and reheating.

6. Discuss advantages and disadvantages of Jet propulsion system over

other propulsion system.

SECTION-C

7. A single cylinder double acting reciprocating compressor compresses

3 kg/min of air. From 1 bar, 300 k to 6 bar. The clearance volume is

such that the maximum pressure at the end of compression cannot exceed

15 bar. Calculate the power input, the volumetric efficiency & the cylinder

dimensions, when the compressor runs at 300 r.p.m. The index of compression

& expansion is equal to 1.3 & stroke/bore ratio is 1.5.

8. In an oil gas turbine installation, ambient pressure is 1 bar & 300 K &

compressed to a pressure of 4 bar. The oil with a calorific value of

42000 KJ/kg is burnt in the combustion chamber to raise the temperature

of air to 550°C. If the air flows at the rate of 1.2 kg/s; Find the net

power of the installation. Also find air fuel ratio. Take Cp=1.05 KJ/kg-K.

9. (a) Explain the working difference between propeller-jet, turbo-jet and

turbo-prop.

(b) Explain the advantages of dual turbine system.