IAT2_hmt_2 MARKS

IAT2_hmt_2 MARKS

University

15 Qs

quiz-placeholder

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IAT2_hmt_2 MARKS

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Assessment

Quiz

Education

University

Medium

Created by

Mr. Vivek

Used 1+ times

FREE Resource

15 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The ratio of energy transferred by convection to that by conduction is called
Stanton number
Nusselt number
Biot number
Preclet number

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The average Nusselt number in laminar natural convection from a vertical wall at 180°C with still air at 20°C is found to be 48. If the wall temperature becomes 30°C, all other parameters remaining same, the average Nusselt number will be:
8
16
24
32

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

A 320 cm high vertical pipe at 150°C wall temperature is in a room with still air at 10°C. This pipe supplies heat at the rate of 8 kW into the room air by natural convection. Assuming laminar flow, the height of the pipe needed to supply 1 kW only is:
10 cm
20 cm
40 cm
80 cm

4.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Drop wise condensation usually occurs on
Glazed surface
Smooth surface
Oily surface
Coated surface

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In spite of large heat transfer coefficients in boiling liquids, fins are used advantageously when the entire surface is exposed to:
Nucleate boiling
Film boiling
Transition boiling
All modes of boiling

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

When a liquid flows through a tube with sub-cooled or saturated boiling, what is the process known?
Pool boiling
Bulk boiling
Convection boiling
Forced convection boiling

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

In a counter flow heat exchanger, for the hot fluid the heat capacity = 2 kJ/kg K, mass flow rate = 5 kg/s, inlet temperature = 150°C, outlet temperature = 100°C. For the cold fluid, heat capacity = 4 kJ/kg K, mass flow rate = 10 kg/s, inlet temperature = 20°C. Neglecting heat transfer to the surroundings, the outlet temperature of the cold fluid in °C is:
7.5
32.5
45.5
70

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