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ESE ME 2018 Achiever Study Plan: Theory of Machines Quiz 2

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Question 1

Heisler charts are used to determine transient heat flow rate and temperature distribution when:

Question 2

The characteristic length for computing Grashof number in the case of horizontal cylinder is

Question 3

Match List –I with List-II and select the correct answer using the code given below the lists:
List-I
A) Heat Exchangers
B) Turbulent flow
C) Free convection
D) Radiation heat transfer
List-II
1) View factor
2) Effectiveness
3) Nusselt number
4) Eddy diffusivity

Question 4

Air at 1 atmospheric pressure and 27 °C blows across a 12 mm diameter sphere at a free stream velocity of 4 m/s. A small heater inside the sphere maintains the surface temperature at 77 °C. With k = 0.026 W/m (kelvin) and with (Nu) = 31.4, the heat loss by the sphere would be

Question 5

The Poisson’s equation of general conduction heat transfer applies to the case

Question 6

Assertion (A) : Dropwise condensation is associated with higher heat transfer rate as compared to the heat transfer rate in flim condensation.
Reason (R) : In drop condensation there is free surface through which direct heat transfer takes place.

Question 7

Consider the diagram given below. Which one of the following is correct?

Question 8

In a counter flow heat exchanger, hot gases enter at 250 °C and leave at 100 °C. Atmospheric air enters at 50 °C and leaves at 80 °C. The heat capacity of hot fluid is less than cold fluid. The effectiveness of the heat exchanger will be

Question 9

For steady, uniform flow through pipes with constant heat flux supplied to the wall, what is the value of Nusseit number?

Question 10

A copper block and an air mass block having similar dimensions are sublected to symmetrical heat transfer from one face of each block. The other face of the block will be reaching to the same temperature at a rate

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ESE & GATE ME Theory of Machines & Vibrations

Jun 4ESE & GATE ME