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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

During storage, the heating value of coal __________________?
A increases
B decreases
C remains constant
D may increase or decrease depending upon the method of storage
Correct Answer: decreases
Film boling occurs at _______________________?
A very low pressure
B atmospheric pressures
C medium pressures
D very high pressures
Correct Answer: very high pressures
For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?
A more heating surface
B less heating surface
C equal heating surface
D heating surface depends on other parameters
Correct Answer: more heating surface
The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
A increases
B decreases
C remains unchanged
D increases/decreases depending on steam temperature requirements
Correct Answer: decreases
The feed check valve is used in order to ______________________?
A regulate flow of boiler water
B check level of water in boiler drum
C recirculate unwanted feed water
D allow high pressure feed water to flow to drum and not allow reverse flow to take place
Correct Answer: allow high pressure feed water to flow to drum and not allow reverse flow to take place
In water wall furnace, the heat is transferred to the water-walls by _________________?
A convection
B radiation
C conduction
D radiation and conducton
Correct Answer: radiation
Fire tube boilers are limited to a maximum design working pressure of ____________________?
A 1 kg/cm
B 6 kg/cm
C 17 kg/cm2
D 100 kg/cm2
Correct Answer: 17 kg/cm2
The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?
A increases
B decreases
C remains unaffected
D first increases and then decreases
Correct Answer: decreases
The steam temperature with increase in load in case of a boiler fitted with radiation super heater________________?
A increases
B decreases
C remains unaffected
D first increases and then decreases
Correct Answer: decreases
A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?
A 100 kg/cm2 and 540°C
B 1 kg/cm2 and 100°C
C 218 kg/cm2 abs and 373°C
D 218 kg/cm2 abs and 540°C
Correct Answer: 218 kg/cm2 abs and 373°C
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