MECHANICAL ENGINEERING MODELS PAPER FOR UPCOMING ENGINEERING EXAM.
01. In white cast iron, presence of carbon is in form of
cementite.
02. The hot tearing in a metal casting is due to
wide range of solidification temperature.
03. Misrun is a casting defect which occurs due to
insufficient fluidity of the molten metal.
04. During heat treatment of steel, the hardness of various structures in increasing order is
spherodite, coarse pearlite, fine pearlite, martensite.
05. Hardness of steel greatly improves with
cyaniding.
06. Fluid is a substance that flows under the
action of
Shearing forces.
07. Which of the following measuring deviceis used for measuring the rate of flow of a fluid flowing through a pipe
venturi meter
&
Orifice meter
SOLUTION
Pitot tube generally measured the velocity at a point in the flow.
08. Which of the following methods can be used to increase efficiency of a Brayton cycIe?
Regeneration
Increasing pressure ratio
Heat exchanger
SOLUTION
A heat exchanger that acts as a counter-flow energy recovery device positioned within the supply and exhaust air streams of an air handling system, in order to recover the waste heat.
09. Engineering material is mostly ductile in nature. The decreasing order of ductility of basic crystalline structure of engineering material
FCC>HCP>BCC
SOLUTION
BCC material is almost brittle in nature
and FCC has the highest ductility.
The correct order is FCC>HCP>BCC.
10. The compression test is carried out on
Brittle material.
11. A four cylinder 4 stroke inline engine is
not balanced for what kind of forces/couples?
secondary forces
SOLUTION
In case of 4 cylinder 4 srtoke inline
engine, only secondary forces remain
unbalanced.
Even though primary forces primary couples
secondary couples are balanced.
12. The defect responsible for slip which cause plastic deformation is widely known as
dislocation.
SOLUTION
Plastic deformation is a phenomenon
in which material undergoes permanent deformation and is main caused due to dislocation of the crystal structure.
13. On the motors with low starting torque,the type of clutch to be used
centrifugal clutch.
SOLUTION
Centrifugal clutch are used with low
starting torque.
14. During solidification of a pure molten metal, the grains in the casting near the mould wall are
coarse and randomly oriented.
15. Shear stress in fluids is directly proportional to
rate of shear strain.
SOLUTION
According to Newton's law of viscosity
Shear stress is directly proportional to
rate of shear strain.
16. Which of the following curves are used to calculate the size of riser
Caine curve.
SOLUTION
Caine curve gives the relation between
volume ratio, freezing ratio and shape
factor. It will give optimum results.
17. The"Jominy test"is used to find
Hardenability.
18. Metal removal in electric discharge
machining takes place through
melting and vaporization.
19. The resultant upward pressure of a fluid on a floating body is equal to the weightof the fluid displaced by the body. This isknown as
Buoyancy force.
20.A Household Fan is an example of
pump
SOLUTION
A household fans blades pushes and turns the air in the direction of the blade motion, therefore it acts as a pump not a blower. Blower forced away the air
radially.
01. In white cast iron, presence of carbon is in form of
cementite.
02. The hot tearing in a metal casting is due to
wide range of solidification temperature.
03. Misrun is a casting defect which occurs due to
insufficient fluidity of the molten metal.
04. During heat treatment of steel, the hardness of various structures in increasing order is
spherodite, coarse pearlite, fine pearlite, martensite.
05. Hardness of steel greatly improves with
cyaniding.
06. Fluid is a substance that flows under the
action of
Shearing forces.
07. Which of the following measuring deviceis used for measuring the rate of flow of a fluid flowing through a pipe
venturi meter
&
Orifice meter
SOLUTION
Pitot tube generally measured the velocity at a point in the flow.
08. Which of the following methods can be used to increase efficiency of a Brayton cycIe?
Regeneration
Increasing pressure ratio
Heat exchanger
SOLUTION
A heat exchanger that acts as a counter-flow energy recovery device positioned within the supply and exhaust air streams of an air handling system, in order to recover the waste heat.
09. Engineering material is mostly ductile in nature. The decreasing order of ductility of basic crystalline structure of engineering material
FCC>HCP>BCC
SOLUTION
BCC material is almost brittle in nature
and FCC has the highest ductility.
The correct order is FCC>HCP>BCC.
10. The compression test is carried out on
Brittle material.
11. A four cylinder 4 stroke inline engine is
not balanced for what kind of forces/couples?
secondary forces
SOLUTION
In case of 4 cylinder 4 srtoke inline
engine, only secondary forces remain
unbalanced.
Even though primary forces primary couples
secondary couples are balanced.
12. The defect responsible for slip which cause plastic deformation is widely known as
dislocation.
SOLUTION
Plastic deformation is a phenomenon
in which material undergoes permanent deformation and is main caused due to dislocation of the crystal structure.
13. On the motors with low starting torque,the type of clutch to be used
centrifugal clutch.
SOLUTION
Centrifugal clutch are used with low
starting torque.
14. During solidification of a pure molten metal, the grains in the casting near the mould wall are
coarse and randomly oriented.
15. Shear stress in fluids is directly proportional to
rate of shear strain.
SOLUTION
According to Newton's law of viscosity
Shear stress is directly proportional to
rate of shear strain.
16. Which of the following curves are used to calculate the size of riser
Caine curve.
SOLUTION
Caine curve gives the relation between
volume ratio, freezing ratio and shape
factor. It will give optimum results.
17. The"Jominy test"is used to find
Hardenability.
18. Metal removal in electric discharge
machining takes place through
melting and vaporization.
19. The resultant upward pressure of a fluid on a floating body is equal to the weightof the fluid displaced by the body. This isknown as
Buoyancy force.
20.A Household Fan is an example of
pump
SOLUTION
A household fans blades pushes and turns the air in the direction of the blade motion, therefore it acts as a pump not a blower. Blower forced away the air
radially.
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