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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

Mechanical Engineering MCQs prepared for job test and interview preparation, especially for fresh graduates, students, and candidates appearing in competitive exams. These multiple-choice questions cover key topics such as Machine Design, Theory of Machines, Hydraulic Machines, and other important mechanical engineering concepts.

Alkaline pyrogallate is used in Orsat’s apparatus for absorption of _________________?

A C02

B CO

C 02

D N2

Review Detailed Answer

Correct Answer: 02

Hygrometery deals with the_________________?

A Hygroscopic substances

B water vapour in air

C temperature of air

D pressure of air

Review Detailed Answer

Correct Answer: water vapour in air

The increase in pressure _________________?

A lowers the boiling point of a liquid

B raises the boiling point of a liquid

C .does not affect the boiling point of a liquid

D reduces its volume

Review Detailed Answer

Correct Answer: raises the boiling point of a liquid

Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________?

A and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2

B and its corresponding conversion into dry steam at desired boiler pressure

C conversion into steam at atmospheric condition

D conversion into steam at the same pres-sure at which feed water is supplied

Review Detailed Answer

Correct Answer: and its corresponding conversion into dry saturated steam at 100°C and 1.033 kg/cm2

Water boils when its vapour pressure ___________________?

A equals that of the surroundings

B equals 760 mm of mercury

C equals to atmospheric pressure

D equals the pressure of water in the container

Review Detailed Answer

Correct Answer: equals that of the surroundings

The state of vapour under saturation condition is described by_______________?

A pressure alone

B temperature alone

C pressure and temperature

D pressure and dryness fraction

Review Detailed Answer

Correct Answer: pressure and dryness fraction

Heating wet steam at constant temperature is heating it at constant_________________?

A volume

B pressure

C entropy

D enthalpy

Review Detailed Answer

Correct Answer: pressure

In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?

A 40%

B 25%

C 50%

D 80%

Review Detailed Answer

Correct Answer: 80%

At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?

A maximum

B minimum

C zero

D depends on temperature also

Review Detailed Answer

Correct Answer: zero

Latent heat of dry steam at atmospneric pressure is equal to____________________?

A 539 kcal/kg

B 539 BTU/lb

C 427 kcal/kg

D 100 kcal/kg

Review Detailed Answer

Correct Answer: 539 kcal/kg

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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

All Topics 1919

All Topics 1919

Alkaline pyrogallate is used in Orsat’s apparatus for absorption of _________________?

Hygrometery deals with the_________________?

The increase in pressure _________________?

Equivalent evaporation of water is the evaporation “for a feed water supply at 100°C__________________?

Water boils when its vapour pressure ___________________?

The state of vapour under saturation condition is described by_______________?

Heating wet steam at constant temperature is heating it at constant_________________?

In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?

At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?

Latent heat of dry steam at atmospneric pressure is equal to____________________?