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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

The thermal efficiency of a gas turbine as compared to a diesel plant is__________________?
A same
B more
C less
D depends on other factors
Correct Answer: less
Gas turbine blades are given a rake___________________?
A equal to zero
B in the direction of motion of blades
C opposite to the direction of motion of blades
D depending on the velocity
Correct Answer: in the direction of motion of blades
Mechanical efficiency of gas turbines as compared to I.C engines is____________________?
A higher
B lower
C same
D depends on on odier considerations
Correct Answer: higher
The fuel consumption in gas turbines is accounted for by___________________?
A low.er heating value
B higher heating value
C heating value
D higher calorific value
Correct Answer: low.er heating value
The pressure ratio for an open cycle gas turbine compared to closed cycle gas turbine of same h.p. is_______________?
A low
B high
C same
D low/high depending on make and type
Correct Answer: low
The work ratio of a gas turbine plant is defined as the ratio of__________________?
A net work output and heat supplied (6) net work output and work done by tur¬bine
B
C actual heat drop and isentropic heat drop
D net work output and isentropic heat drop
Correct Answer: net work output and isentropic heat drop
Rotary compressors are suitable for ____________________?
A large discharge at high pressure
B low discharge at high pressure
C large discharge at low pressure
D low discharge at low pressure
Correct Answer: large discharge at low pressure
Gas turbine works on______________?
A Brayton or Atkinson cycle
B Carnot cycle
C Rankine cycle
D Erricsson cycle
Correct Answer: Brayton or Atkinson cycle
Gas turbine works on_______________?
A Brayton or Atkinson cycle
B Carnot cycle
C Rankine cycle
D Erricsson cycle
Correct Answer: Brayton or Atkinson cycle
The pressure ratio of an ideal vaned compressor with increase in mass flow rate_________________?
A increases
B decreases
C remains constant
D first decreases and then increases
Correct Answer: remains constant
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