Free Convection Boiling - MCQ Practice Test with solutions, GATE ME Heat
MCQ Practice Test & Solutions: Test: Free Convection Boiling (10 Questions)
You can prepare effectively for Mechanical Engineering Heat Transfer with this dedicated MCQ Practice Test (available with solutions) on the important topic of "Test: Free Convection Boiling". These 10 questions have been designed by the experts with the latest curriculum of Mechanical Engineering 2026, to help you master the concept.
Test Highlights:
- - Format: Multiple Choice Questions (MCQ)
- - Duration: 10 minutes
- - Number of Questions: 10
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When evaporation takes place at the liquid-vapor interface, the heat transfer is solely due to free convection and the film coefficient follows the relation
Detailed Solution: Question 1
Detailed Solution: Question 2
A 0.10 cm diameter and 15 cm long wire has been laid horizontally and submerged in water at atmospheric pressure. The wire has a steady state voltage drop of 14.5 V and a current of 42.5 A. Determine the heat flux of the wire.
The following equation applies for water boiling on a horizontal submerged surface
H = 1.54 (Q/A) 0.75 = 5.58 (d t) 3 W/m2 K where Q/A is the heat flux rate in W/m2 and d t is the temperature difference between surface and saturation
The following equation applies for water boiling on a horizontal submerged surface
H = 1.54 (Q/A) 0.75 = 5.58 (d t) 3 W/m2 K where Q/A is the heat flux rate in W/m2 and d t is the temperature difference between surface and saturation
Detailed Solution: Question 3
Consider the above problem, find the excess temperature of the wire
Detailed Solution: Question 4
Natural convection heat transfer coefficients over surface of a vertical pipe and a vertical flat plate for same height. What is/are the possible reasons for this?
(i) Same height
(ii) Both vertical
(iii) Same fluid
(iv) Same fluid flow pattern
Select the correct answer
(i) Same height
(ii) Both vertical
(iii) Same fluid
(iv) Same fluid flow pattern
Select the correct answer
Detailed Solution: Question 5
The heat flux in nucleate boiling varies in accordance with
Detailed Solution: Question 6
Detailed Solution: Question 7
Identify the wrong statement with respect to boiling heat transfer?
Detailed Solution: Question 8
Estimate the peak heat flux for water boiling at normal atmospheric pressure. The relevant thermo-physical properties are
p f (liquid) = 958.45 kg/m3
p g (vapor) = 0.61 kg/m3
h f g = 2.25 * 10 6 J/kg
σ = 0.0585 N/m
p f (liquid) = 958.45 kg/m3
p g (vapor) = 0.61 kg/m3
h f g = 2.25 * 10 6 J/kg
σ = 0.0585 N/m
Detailed Solution: Question 9
A 1.0 mm diameter and 300 mm long nickel wire is submerged horizontal in water at atmospheric pressure. At burnout, the wire has a current of 195 A. Calculate the voltage at burnout. The relevant thermos-physical properties are
p f (fluid) = 959.52 kg/m3
p g (vapor) = 0.597 kg/m3
h f g = 2257000 J/kg
σ = 0.0533 N/m
p f (fluid) = 959.52 kg/m3
p g (vapor) = 0.597 kg/m3
h f g = 2257000 J/kg
σ = 0.0533 N/m
Detailed Solution: Question 10
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