Free Heat Transfer Operations MCQs with Answers
645 Heat Transfer Operations MCQs from Chemical Engineering, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Laminar flow
- B. Co-current flow
- C. Heat flow rate is independent of nature of flow
- D. Turbulent flow
Explanation: Turbulent flow enhances mixing and reduces the thermal boundary-layer resistance, giving a higher convective heat-transfer coefficient…
Correct answer: Turbulent flow- A. T0.5
- B. T
- C. T1.5
- D. T2
Explanation: Kinetic theory gives gas molecules an average speed proportional to the square root of absolute temperature.
Correct answer: T0.5- A. 10.73 kJ
- B. 16.15 kJ
- C. 18.11 kJ
- D. 18.33 kJ
Explanation: The heat released is obtained by integrating the heat capacity over the temperature drop: Q = 26.693(600) + (7.365 × 10^-3/2)(773.15² −…
Correct answer: 18.11 kJ- A. Hour
- B. Minute
- C. Day
- D. Second
Explanation: One ton of refrigeration is the cooling rate required to melt one ton of ice at 0C in 24 hours.
Correct answer: Day- A. Molten potassium
- B. Molten lead
- C. Mercury
- D. Molten sodium
Explanation: Among the listed liquid metals, molten sodium has the highest thermal conductivity, making it effective for high-temperature heat…
Correct answer: Molten sodium- A. Both A. & B.
- B. Of increased diameter
- C. With greater number of blades
- D. Neither A. nor B.
Explanation: A larger fan with more blades can deliver the required air flow at a lower rotational speed, reducing blade-passage turbulence and noise.
Correct answer: Both A. & B.- A. Shaft furnace
- B. Rotary hearth furnace
- C. Tunnel kiln
- D. Muffle furnace
Explanation: A tunnel kiln provides continuous, controlled preheating and drying of large quantities of refractory bricks as they move through…
Correct answer: Tunnel kiln- A. Sidefired
- B. Recirculating
- C. Covered
- D. Underfired
Explanation: When combustion occurs below the hearth and the hot gases rise into the heating chamber, the furnace is underfired.
Correct answer: Underfired- A. Sankey diagram
- B. Cox chart
- C. Ostwald chart
- D. None of these
Explanation: A Sankey diagram represents an energy or heat balance by showing input energy and its useful and wasted outputs in proportionate widths.
Correct answer: Sankey diagram- A. Conduction
- B. Radiation of heat from the roof of the combustion chamber
- C. Natural convection
- D. None of these
Explanation: In a reverberatory furnace, the flame and hot gases heat the roof, which then radiates heat onto the charge.
Correct answer: Radiation of heat from the roof of the combustion chamber- A. 350
- B. 750
- C. 1050
- D. 1250
Explanation: Metallic recuperators are generally limited to about 750°C because oxidation and high-temperature corrosion become severe above this…
Correct answer: 750- A. Use of non-preheated combustion air
- B. Use of pulverised solid fuels
- C. Use of excessive positive draft in the furnace
- D. Imperfect mixing of fuel & air and infiltration of air
Explanation: Complete combustion would require perfect fuel-air mixing and no air leakage, conditions that are not achieved in practical furnaces.
Correct answer: Imperfect mixing of fuel & air and infiltration of air- A. Muffle furnace
- B. Annealing furnace
- C. Reheating furnace
- D. Rotary kiln
Explanation: An annealing furnace is specifically designed for heat treatment, in which controlled heating and cooling soften the material and relieve…
Correct answer: Annealing furnace- A. Resistance
- B. Low frequency induction
- C. Arc
- D. None of these
Explanation: An arc furnace generates heat through an electric arc between electrodes and the charge.
Correct answer: Arc- A. Heat release rate of the fuel
- B. Preheat temperature of fuel & air
- C. All A., B. and C.
- D. Method of mixing the fuel & air
Explanation: The chamber must provide enough volume for the required heat release and residence time, both of which are affected by fuel-air mixing and…
Correct answer: All A., B. and C.- A. Preheating of cold stock
- B. Preheating of combustion air
- C. Steam generation in waste heat boilers
- D. All A., B. and C.
Explanation: Flue-gas heat can be recovered by heating the stock, preheating combustion air, or producing steam in a waste-heat boiler.
Correct answer: All A., B. and C.- A. Pot
- B. Induction
- C. Arc
- D. Resistance
Explanation: Arc, induction, and resistance furnaces convert electrical energy into heat.
Correct answer: Pot- A. Permits the use of high ash content coal
- B. Accelerates the burning rate and economises on fuel consumption
- C. Permits the use of low fusion point ash coal
- D. All A., B. and C.
Explanation: Pulverising coal greatly increases its surface area, so combustion is faster and more complete, reducing fuel consumption.
Correct answer: Accelerates the burning rate and economises on fuel consumption- A. Blast furnace
- B. Steam boiler
- C. Salt bath furnace
- D. Annealing furnace
Explanation: In a salt-bath furnace, the workpiece is immersed in molten salt, which acts as the liquid heat-transfer medium and gives rapid, uniform…
Correct answer: Salt bath furnace- A. Type of fuels viz. solid, liquid or gaseous
- B. Flue gas temperature
- C. Emissivity of refractory walls
- D. Initial temperature of the charged stock
Explanation: The heat-transfer relation is governed directly by temperatures, area, and surface emissivity, not by whether the fuel is solid, liquid…
Correct answer: Type of fuels viz. solid, liquid or gaseousHeat Transfer Operations MCQs: common questions
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There are 645 Heat Transfer Operations MCQs in the Chemical Engineering bank, shown 20 to a page with the correct answer and an explanation on each.
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