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Mechanical Engineering Mcqs 1919 MCQs [All-Courses]

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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.

All Topics  1919

For water, at pressures below atmospheric___________________?
A melting point rises slightly and boiling point drops markedly
B melting point rises markedly and boiling point drops markedly
C melting point drops slightly and boiling point drops markedly
D melting point drops slightly and boiling point drops slightly
Correct Answer: melting point rises slightly and boiling point drops markedly
The saturation temperature of steam with increase in pressure increases____________________?
A linearly
B rapidly first and then slowly
C slowly first and then rapidly
D inversely
Correct Answer: rapidly first and then slowly
Superheating of steam is done at_________________?
A constant volume
B constant temperature
C constant pressure
D constant entropy
Correct Answer: constant pressure
Stoichiometric quantity of air is the___________________?
A air present in atmosphere at NTP conditions
B air required for complete combustion of fuel with no excess air
C air required for optimum combustion so as to have reasonable excess air
D air required to convert CO into C02
Correct Answer: air required for complete combustion of fuel with no excess air
The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?
A 0.1 to 0.2 kg
B 0.2 to 0.4 kg
C 0.6 to 0.8 kg
D 1.0 to 1.5 kg
Correct Answer: 0.6 to 0.8 kg
The specific volume of steam with increase in pressure decreases_____________________?
A linearly
B slowly first and then rapidly
C rapidly first and then slowly
D inversely
Correct Answer: rapidly first and then slowly
If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Dalton’s law, the pressure in condenser is equal to__________________?
A Ps-Pa
B pa-ps
C Pa+P
D non of these
Correct Answer: Pa+P
Heating of dry steam above saturation temperature is known as_____________________?
A enthalpy
B superheating
C supersaturation
D latent heat
Correct Answer: superheating
Carbonation of coal is the process of________________________?
A pulverising coal in inert atmosphere
B heating wood in a limited supply of air at temperatures below 300°C
C strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
D binding the pulverised coal into brick-ettes
Correct Answer: strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?
A less
B more
C equal
D may be less or more depending on temperature
Correct Answer: less
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