» Thermal Engineering 2 solved MCQs

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Question: What is Mach number? A. speed of object * speed of sound B. speed of object /speed of sound C. speed of object + speed of sound D. speed of object- speed of sound Answer» b. speed of object…

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Question: A mass of 4kg rests on a horizontal plane. The plane is gradually inclined until at an angle θ= 15° with the horizontal, the mass just begins to slide. What is the coefficient of static friction between the block…

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Question: The evaporation process is a A. constant volume reversible process B. constant pressure reversible process C. adiabatic throttling process D. reversible adiabatic process Answer» b. constant pressure reversible process Note: The above multiple-choice question is for all general and…

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Question: The Prandtl Number approximates A. momentum diffusivity to thermal diffusivity B. thermal diffusivity to momentum diffusivity C. shear stress to thermal diffusivity D. thermal diffusivity to kinematic viscosity Answer» a. momentum diffusivity to thermal diffusivity Note: The above multiple-choice…

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Question: Compounding efficiency at low speed. A. decrease B. increase C. maximizes D. none of the mentioned Answer» b. increase Note: The above multiple-choice question is for all general and Competitive Exams in India. 

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Question: What is the function of Blow down valve of a boiler? A. to remove sludge B. to build sediments C. to remove flue gas D. to remove ash Answer» a. to remove sludge Note: The above multiple-choice question is…

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Question: Why is wet compression not preferred? A. the liquid refrigerant can be trapped in the head of cylinder B. this may damage the valves or cylinder head C. liquid refrigerant can wash away the lubricating oil thus accelerating wear…