Mechanical Engineering Viva Questions

20 TOP Heat Transfer LAB VIVA Questions Answers

20 TOP Heat Transfer LAB VIVA Questions Answers

Heat Transfer LAB VIVA Questions and Answers pdf:

1. Heat transfer rate per unit area by conduction is proportional to the normal temperature gradient.
2. A physical property of a substance that characterises the ability of the substance to transfer heat.
3. The ratio of (product of thermal conductivity and area) and the wall thickness.
4. Walls of several heterogeneous layers.
5. Mean rndius for heat transfer by conduction through hollow cylinder of radii r1 and r2.
6. Mean radius for heat transfer by conduction through hollow sphere of radii r1 and r2.
8. The ratio of (product of coefficient of heat transfer and length) and thermal conductivity.
9. Heat transfer taking place by means of electromagnetic waves.
15. Relationship for black bodies between monochromatic emissive power and different wavelengths.
16. The total emission from a black body per unit time varies directly as the fourth power of the absolute temperature.
17. At thermal equilibrium, the absorptivity and emissivity are
ANSWERS:
1. Fourier’s law
2. thermal conductivity
3. thermal conductance
4. composite
5. [(r2-r1) / Log (r2/r1)] 6. Root of r1r2
8. Nusselt Number
9. radiation
15. Planck’s law
16. Stefan Boltzman law
17. same

Compressors,Gas Turbines & Jet Engines LAB VIVA Questions and Answers pdf:

1. As the value of index of compression ‘n’ increases, the work done in compressing air
2. If n is the index of compression, then work done in compressing air is proportional to
3. Work input to compressor is minimum when the law of compression followed is
4. The compression law (pv)1.4 = constant on temperature – entropy diagram is represented by _____line.
5. The volumetric efficiency with fixed clearance volume and suction being from atmosphere and with increase in delivery pressure will
6. For the given pressure ratio, the leakage past the piston in multi stape compression in comparison to single stage compression is
7. If index of compression for first stage of compression is higher than second stage, then for perfect inter-cooling and minimum total work, the first stage shares work than second.
8. If m and n be the indices of compression for first and second stages of compression, then with perfect intercooling and for minimum work done, the ratio of first stage to second stage of work is ______.
9. Low value of ‘n’ (index of compression) is obtained by _______.
10. In case of compressor used with gas turbine ______ compression is preferable.
11. Amount of work done to compress a given mass of air under specified conditions is ______ .clearance ratio.

Answers:
1. increases
2. (n/n-1)
3. isothermal
4. vertical
5. decrease
6. less
7. more
8. [m(n – 1)/n(m-1)] 9. cooling the compressor cylinder
10. adiabatic
11. independent

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