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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

Choose the correct statement ________________?
A gas turbine requires lot of cooling water
B gas turbine is capable of rapid start up and loading
C gas turbines have flat efficiency at part loads
D gas turbines have high standby losses and require lot of maintenance
Correct Answer: gas turbine is capable of rapid start up and loading
Pick up the correct statement ?
A large gas turbines use radial inflow turbines
B gas turbines have their blades similar to steam turbine
C gas .turbine’s blade will appear as impulse section at the hub and as a reaction section at tip
D gas turbines use both air and liquid cooling
Correct Answer: gas .turbine’s blade will appear as impulse section at the hub and as a reaction section at tip
Pick up the wrong statement ?
A pulsojet requires no ambient air for propulsion
B ramjet-engine has no turbine
C turbine drives compressor in a burbojet
D bypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy
Correct Answer: pulsojet requires no ambient air for propulsion
Pick up the false statement ?
A gas turbine is a self-starting unit
B gas turbine does not require huge quantity of water like steam plant
C exhaust losses in gas turbine are high due to large mass flow rate
D overall efficiency of gas turbine plant is lower than that of a reciprocating engine
Correct Answer: gas turbine is a self-starting unit
In jet engines the products of combustion after passing through the gas lurbine are discharged into_______________?
A atmosphere
B back to the compressor
C discharge nozzle
D vacuum
Correct Answer: discharge nozzle
If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix i and o stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity______________?
A Vi=V0B
B Vt>V0
C U,<V0
D V,= U0
Correct Answer: Vi=V0B
The working fluid in ai turbine is___________________?
A in two phases
B in three phases
C in a single phase
D in the form of air and water mixture
Correct Answer: in a single phase
The compression ratio in a gas turbine is of the roder of____________________?
A 3.5 : 1
B 5 : 1
C 8 : 1
D 12 : 1
Correct Answer: 8 : 1
Ram-jet engine__________________?
A is self-operating at zero flight speed
B is not self-operating at zero^flight speed
C requires no air for its operation
D produces a jet consisting of plasma
Correct Answer: is not self-operating at zero^flight speed
A simple turbo-jet engine is basically_________________?
A a propeller system
B gas-turbine engine equipped with a propulsive nozzle and diffuse*
C chemical rocket regine
D ram-jet enigne
Correct Answer: gas-turbine engine equipped with a propulsive nozzle and diffuse*
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