Friday, November 2, 2018

MECHANICAL ENGINEERING MCQ SECTION 38

381. What are the compact heat exchangers?

the heat exchangers having large surface area per unit volume.

382.What is the purpose of using baffles in shell-and-tube heat exchangers?

to maintain uniform spacing between tubes and enhance the heat transfer.

383.In parallel flow heat exchangers________


the exit temperature of hot fluid is always more than the exit temperature of cold fluid.

384.Fixed volumes is a characteristic of

Liquids & Solids.

385.Data loggers are helpful in

plotting a heating curve & cooling curve.

386. A much slower process than boiling that is called

Evaporation.

387.Liquids may become vapors

at a temperature below the boiling point of a liquid.

388.A constant temperature at which a pure liquid change into a gas that is called

boiling point.

389.Thermodynamic temperature scale in SI system is the

Kelvin Scale.

390.in an irreversible process, there is

loss of heat.


391.During thermodynamic throttling process

there is no change of internal energy
no work is done
heat exchange does not take place
All of these


392.In an isothermal process for perfect gas, sum of heat flow and work input is

Zero.


393. "Heat can flow from cold substance to hot substance with the aid of external work".

Clausius name is associated with the above statement.

394. One bar pressure is the same as

100,000 N/m2

395.  Air leaking from a punctured tube is an example of

Throttling process.

396. A diathermic wall permits

Heat exchange by all the three modes of heat transfer.

397. A Brayton cycle is also a reversed

Joule cycle.

398. In a Carnot cycle the heat is rejected at

Constant temperature.

399. In a Joule cycle, the heat is rejected at

Constant pressure.

400. Which one of the following is an indirect reaction device?

Propeller.

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Idioms mcq For Competitive Exams

Idioms mcq For Competitive Exams