Hello students welcome to msbte news in this article we have provided 22510 Heat Transfer Mcq Questions and Answer. This Heat Transfer Mcq with Answers is ideal for Students who are in Third Year of Diploma in Chemical Engineering courses. By referring Heat Transfer Mcq pdf for Diploma you will get to know about the paper pattern of Msbte Mcq Winter 2021 exams.
with this Mcq on Heat Transfer Chemical Engineering 3rd year students can practice for their upcoming Winter 2021 exams. In this Heat Transfer engineering objective questions we have selected 30 important questions from previous year papers. We have Given Heat Transfer Mcq with Answers Pdf Download Link Below Feel Free to Download and Learn.
Table of Contents
22510 Heat Transfer Mcq Questions and Answer
1. Which of the following has maximum thermal conductivity at the same temperature?
(A) Steel
(B) Petrol
(C) Air
(D) All have the same conductivity
Correct!
Wrong!
2. A concentric double pipe heat exchanger as compared to the shell and tube heat exchanger for the same heat load requires
(A) Less heating surface
(B) More space
(C) Lower maintenance cost
(D) None of these
Correct!
Wrong!
3. Maximum water velocity in tubes of a 1-2 shell and tube heat exchanger may be around __________ metres/second.
(A) 1
(B) 10
(C) 20
(D) 30
Correct!
Wrong!
4. For the same heat load and mass flow rate in the tube side of a shell and tube heat exchanger, one may use multipass on the tube side, because it
(A) Decreases the pressure drop
(A) Decreases the pressure drop
(C) Increases the overall heat transfer coefficient
(D) None of these
Correct!
Wrong!
5. A tank painted with which of the following coloured paints, would heat up maximum by radiation from sun?
(A) Yellow paint
(B) White paint
(C) Black paint
(D) Grey paint
Correct!
Wrong!
6. Walls of a cubical oven are of thickness l, and they are made of material of thermal conductivity k. The temperature inside the oven is 100°C and the inside heat transfer co-efficient is ‘3k/l’. If the wall temperature on the outside is held at 25°C, what is the inside wall temperature in degree centigrade?
(A) 35.5
(B) 43.75
(C) 81.25
(D) 48.25
Correct!
Wrong!
7. Three materials A, B and C of equal thickness and of thermal conductivity of 20, 40 & 60 kcal/hr. m. °C respectively are joined together. The temperature outside of A and C are 30°C and 100°C respectively. The interface between B and C will be at a temperature of __________ °C.
(A) 40
(B) 95
(C) 70
(D) 50
Correct!
Wrong!
8. A graph between __________ is called Wilson plot.
(A) (1/U) Vs. (1/v0.8)
(B) (1/v0.8) Vs. U
(C) v0.8 Vs . U
(D) (1/U) Vs. (1/V)
Correct!
Wrong!
- The thermal radiation emitted by a body is proportional to Tn, where T is its absolute temperature. The value of ‘n’ is exactly 4 for
(A) Black painted bodies only
(B) All bodies
(C) Polished bodies only
(D) A black body
Correct!
Wrong!
10. For a laminar flow of fluid in a circular tube, ‘h1’ is the convective heat transfer co-efficient at velocity ‘V1’. If the velocity is reduced by half and assuming the fluid properties are constant, the new convective heat transfer co-efficient is
(A) 1.26 h1
(B) 0.794 h1
(C) 0.574 h1
(D) 1.741 h1
Correct!
Wrong!
- Pick out the correct statement.
(A) 1 kcal/hr.m.°C is equal to 1 BTU/hr. ft.°F
(B) In steady state heat conduction, the only property of the substance which determines the temperature distribution, is the thermal conductivity
(C) In unsteady state heat conduction, heat flows in the direction of temperature rise
(D) In heat transfer by forced convection, Grashoff number is very important
Correct!
Wrong!
12. Evaporation by thermo compression results in the
(A) Saving of steam
(B) Realisation of multiple effect economy in a single effect
(C) Both (A) and (B)
(D) None of these
Correct!
Wrong!
13. Fouling factor for a heat exchanger is given by (where, U1 = heat transfer co-efficient of dirty surface U2 = heat transfer co-efficient of clean surface).
(A) U1 – U2
(B) 1/U1 – 1/U2
(C) 1/U2 – 1/U1
(D) U2 – U1
Correct!
Wrong!
14. Use of transverse baffles in a shell and tube heat exchanger is done to increase the
(A) Rate of heat transfer
(B) Flow velocity
(C) Turbulence of shell side fluid
(D) All (A), (B) and (C)
Correct!
Wrong!
- All analogy equations connecting friction factor and heat transfer co-efficient apply only to
(A) Wall or skin friction
(B) Form friction
(C) Both (A) and (B)
(D) Turbulent flow
Correct!
Wrong!
16. Which of the following situations can be approximated to a steady state heat transfer system?
(A) A red hot steel slab (having outside surface temperature as 1300°C) exposed to the atmospheric air at 35°C
(B) 10 kg of dry saturated steam at 8 kgf/cm2 flowing through a short length of stainless steel pipe exposed to atmospheric air at 35°C
(C) Boiling brine kept in open vessel when the bottom surface temperature of the vessel is maintained constant at 180°C
(D) A sub-cooled refrigerant liquid at 8°C flowing at the rate of 6 Kg/minute through a copper pipe exposed to atmospheric air at 35°C
Correct!
Wrong!
17. Reason for operating an evaporator in multiple effects is to secure
(A) Increased steam economy
(B) Decreased steam consumption
(C) Both (A) and (B)
(D) Increased capacity
Correct!
Wrong!
- Heat transfer by __________ may not necessarily require the presence of a medium.
(A) Conduction
(B) Natural convection
(C) Forced convection
(D) Radiation
Correct!
Wrong!
19. Fluid motion in the natural convection heat transfer between a solid surface and a fluid in contact with it, results from the
(A) Existence of thermal boundary layer
(B) Temperature gradient produced due to density difference
(C) Buoyancy of the bubbles produced at active nucleation site
(D) None of these
Correct!
Wrong!
- Nusselt number is the ratio of the
(A) Temperature gradient of the wall to that across the entire pip
(B) Temperature difference to the temperature gradient at the wall
(C) Heat flux at the wall to that across the entire pipe
(D) None of these
Correct!
Wrong!
21. Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.
(A) Grashoff
(B) Reynolds
(C) Both ‘a’ & ‘b’
(D) Prandtl & Grashoff
Correct!
Wrong!
22. Prandtl number is the reciprocal of
(A) Thermal diffusivity/Momentum diffusivity
(B) Thermal diffusivity × Momentum
(C) Thermal diffusivity × Mass diffusivity
(D) Mass diffusivity × Momentum diffusivity
Correct!
Wrong!
23. In case of parallel flow heat exchanger, the lowest temperature theoretically attainable by the hot fluid is __________ the outlet temperature of the cold fluid.
(A) Equal to
(B) More than
(C) Less than
(D) Either more or less than (depending upon the fluid)
Correct!
Wrong!
24. Evaporator tubes are generally
(A) Horizontal
(B) Vertical
(C) Inclined
(D) Random
Correct!
Wrong!
25. Thermal conductivity of a gas at low density, __________ with increase in temperature.
(A) Decreases
(B) Increases
(C) Remains unchanged
(D) May increase or decrease; depends on the gas
Correct!
Wrong!
- Which of the following is the most widely used heat insulating material for pipelines carrying steam?
(A) Tar dolomite bricks followed by asbestos
(B) Fireclay refractory followed by aluminium sheet
(C) Cotton followed by aluminium foil
(D) 85% magnesia cement and glass wool
Correct!
Wrong!
27. The interchange factor for radiation heat transfer from surface ‘x’ to surface ‘y’ in case of an infinite parallel planes with emissivities εx & εy is given by
(A) εx + εy
(B) εx . εy
(C) 1/εx + 1/εy
(D) (εx + εy)/( εx + εy – εx . εy)
Correct!
Wrong!
28. If the thermal conductivity of a wall material is independent of temperature, the steady state temperature distribution in the very large thin plane wall having steady, uniform surface temperature follows __________ law.
(A) Parabolic
(B) Hyperbolic
(C) Linear
(D) Logarithmic
Correct!
Wrong!
29. With increase in temperature, the thermal conductivity of a gas
(A) Increases
(B) Decreases
(C) Remain same
(D) May increase or decrease depending on the type of gas
Correct!
Wrong!
30. Grashoff number is given by
(A) gD3.β.Δtρ2/μ2
(B) gD2βΔtρ/μ2
(C) gD2βΔtP2μ
(D) gD3βΔtP2/μ
Correct!
Wrong!
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22510 Heat Transfer Mcq with Answers Pdf
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