In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?

Byadmin March 2, 2019August 24, 2021

In case of _______________ boiling, the liquid temperature is below the saturation temperature and the boiling takes place in the vicinity of the heated surface?

A. Nucleate
B. Local
C. Pool
D. Saturated

Chemical Heat Transfer

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?

A. 0.35
B. 0.45
C. 0.55
D. 0.85

Read More Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be_________________?
Chemical Heat Transfer

Which of the following has the lowest Prandtl number ?

Which of the following has the lowest Prandtl number ?

A. Molten sodium (a coolant used in fast breeder reactor)
B. Water
C. Transformer oil
D. Dilute H2SO4

Read More Which of the following has the lowest Prandtl number ?
Chemical Heat Transfer

A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is ________________?

A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is ________________?

A. 0
B. R2/(R1+R2)
C. 1
D. (R1/R2)2

Read More A sphere of radius ‘R1’ is enclosed in a sphere of radius ‘R2’. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is ________________?
Chemical Heat Transfer

The absorptivity of a body is equal to its emissivity _________________?

The absorptivity of a body is equal to its emissivity _________________?

A. At a particular temperature
B. For circular bodies
C. Under thermal equilibrium
D. None of these

Read More The absorptivity of a body is equal to its emissivity _________________?
Chemical Heat Transfer

LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________________?

LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________________?

A. 0
B. 1
C. > 1
D. < 1

Read More LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is __________________?
Chemical Heat Transfer

Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?

Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?

A. Aluminium foil
B. Refractory bricks
C. Iron plate
D. Coke breeze

Read More Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?

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