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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

Surging phenomenon in centrifugal com-pressor depends on ___________________?
A mass flow rate
B pressure ratio
C change in load
D stagnation pressure at the outlet
Correct Answer: stagnation pressure at the outlet
Gas turbines for power generaion are normally used___________________?
A to supply base load requirements
B to supply peak load requirements
C to enable start thermal power plant
D in emergency
Correct Answer: to supply peak load requirements
Open cycle gas turbine works on___________________?
A Brayton or Atkinson cycle
B
C Carnot cycle
D Erricsson cycle
Correct Answer: Brayton or Atkinson cycle
The work ratio of simple gas turbine cycle depends on_________________?
A pressure ratio
B maximum cycle temperature
C minimum cycle temperature
D all of the above
Correct Answer: all of the above
The vloumetric efficiency of compressor with increase in compression ratio will ___________________?
A increase
B decrease
C remain same
D may increase/decrease depending on clearance volume
Correct Answer: decrease
Axial flow compressor resembles____________________ ?
A centrifugal pump
B reciprocating pump
C turbine
D sliding vane compressor
Correct Answer: turbine
Atmospheric pressure is 1.03 kg/cm and vapour pressure is 0.03 kg/cm . The air pressure will be_____________________ ?
A 1.03 kg/cm2
B 1.06 kg/cm2
C 1.00 kg/cm2
D 0.53 kg/cm2
Correct Answer: 1.00 kg/cm2
Axial flow compressor has the following advantage over centrifugal compressor__________________?
A larger air handling ability per unit frontal area
B higher pressure ratio per stage
C aerofoil blades are used
D higher average velocities
Correct Answer: larger air handling ability per unit frontal area
Maximum delivery pressure is a rotary air compressor is of the order of__________________?
A 6 kg/cm2
B 10 kg/cm2
C 16 kg/cm2
D 25 kg/cm2
Correct Answer: 10 kg/cm2
The thermodynamic efficiency of rotary compressor is based on_______________?
A isothermal compression
B adiabatic compression
C isentropic compression
D polytropic compression
Correct Answer: adiabatic compression
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