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Mechanical Engineering Engineering Mechanics Part-2
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Mechanical Engineering Engineering Mechanics Part-2
1
A single force and a couple acting in the same plane upon a rigid body
A
balance each other
B
cannot balance each other
C
produce moment of a couple
D
are equivalent
2
A body moves from rest with a constant acceleration of 5 m per sec. The distance covered in 5 sec is most nearly
A
38 m
B
62.5 m
C
6 m
D
124 m
3
The C.G. of a right circular solid cone of height h lies at the following distance from the base
A
h/2
B
J/3
C
h/6
D
h/4
4
A particle inside a hollow sphere of radius r having coefficient of friction -rr can rest upto height of
A
r/2
B
r/A
C
r/%
D
0.134 r
5
In actual machinesmechanical advantage is unity
A
mechanical advantage is greater than velocity ratio
B
mechanical advantage is equal to velocity ratio
C
mechanical advantage is less than velocity ratio
D
mechanical advantage is unity
6
The necessary condition for forces to be in equilibrium is that these should beboth (a) and (b) aboveall be equal
A
coplanar
B
meet at one point ;
C
both (a) and (b) above
D
all be equal
7
In ideal machines
A
mechanical advantage is greater than velocity ratio
B
mechanical advantage is equal to velocity ratio
C
mechanical advantage is less than velocity ratio
D
mechanical advantage is unity
8
The co-efficient of friction depends upon
A
nature of surfaces
B
area of contact
C
shape of the surfaces
D
ail of the above.
9
The C.G. of a plane lamina will not be at its geometrical centre in the case of a
A
right angled triangle
B
equilateral triangle
C
square
D
circle
10
. If three forces acting in one plane upon a rigid body keep it in equilibrium then they must eitherbe all parallelat least two of them must meet
A
meet in a point
B
be all parallel
C
at least two of them must meet
D
all the above are correct
11
The angle which an inclined plane makes with the horizontal when a body placed on it is about to move down is known as angle of
A
friction
B
limiting friction
C
repose
D
kinematic friction
12
Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than oneellipsecircle
A
ellipse
B
hyperbola
C
parabola
D
circle
13
If three forces acting in different planes can be represented by a triangle these will be in
A
non-equilibrium
B
partial equilibrium
C
full equilibrium
D
unpredictable
14
The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is
A
same
B
double
C
half
D
four times
15
Which of the following is not the unit of energy
A
kg m
B
kcal
C
wattr
D
watt hours
16
If a suspended body is struck at the centre of percussion then the pressure on die axis passing through the point of suspension will bezero
A
maximum
B
minimum
C
zero
D
infinity
17
In the equation of virtual work following force is neglectedreaction at a point or an axis fixed in space around which a body is con-all of the above
A
reaction of any smooth surface with which the body is in contact
B
reaction of a rough surface of a body which rolls on it without slipping
C
reaction at a point or an axis fixed in space around which a body is con-
D
strained to turn
18
The centre of percussion of a solid cylinder of radius r resting on a horizontal plane will be2r/3
A
r/2
B
2r/3
C
r/A
D
3r/2
19
Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
A
along the plane
B
horizontally
C
vertically
D
at an angle equal to the angle of fric?tion to the inclined plane
20
On a ladder resting on smooth ground and leaning against vertical wall the force of friction will be
A
towards the wall at its upper end
B
away from the wall at its upper end
C
upwards at its upper end
D
downwards at its upper end
21
Tangent of angle of friction is equal to
A
kinetic friction
B
limiting friction
C
angle of repose
D
coefficient of friction
22
Coulomb friction is the friction betweentwo dry surfaces
A
bodies having relative motion
B
two dry surfaces
C
two lubricated surfaces
D
solids and liquids
23
Angle oT friction is the
A
angle between normal reaction and the resultant of normal reaction and the limiting friction
B
ratio of limiting friction and normal reaction
C
he ratio of minimum friction force to the friction force acting when the body is just about to move
D
the ratio of minimum friction force to friction force acting when the body is in motion
24
Dynamic friction as compared to static friction ishas no correlation.
A
same
B
more
C
less
D
may be less of more depending on na-ture of surfaces and velocity
25
A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to
A
W
B
W sin (a + $)
C
Wtan(a + <|))
D
Wan(a-)
26
Kinetic friction is thethe friction force acting when the body is in motion
A
tangent of angle between normal reac-tion and the resultant of normal reac-tion and the limiting friction
B
ratio of limiting friction and normal reaction
C
the friction force acting when the body is just about to move
D
the friction force acting when the body is in motion
27
72. Which one of the following statements is not correctnone of the above.
A
the tangent of the angle of friction is equal to coefficient of friction
B
the angle of repose is equal to angle of friction
C
the tangent of the angle of repose is equal to coefficient of friction
D
the sine of the angle of repose is equal to coefficient to friction
28
The ratio of limiting friction and normal reaction is known as
A
coefficient of friction
B
angle of friction
C
angle of repose
D
sliding friction
29
Pick up wrong statement about friction force for dry surfaces. Friction force is
A
proportional to normal load between the surfaces
B
dependent on the materials of contact surface
C
proportional to velocity of sliding
D
independent of the area of contact sur-faces
30
The resultant of the following three couples 20 kg force 0.5 m arm $ ve sense 30 kg force 1 m arm - ve sense 40 kg force 0.25 m arm + ve sense having arm of 0.5 m will be
A
20 kg - ve sense
B
20 kg + ve sense
C
10 kg + ve sense
D
10 kg - ve sense
31
The effort required to lift a load W on a screw jack with helix angle a and angle of friction
A
Wtan(a + <)>)
B
Wtan(a-<)>)
C
Wcos(a + )
D
Wsin(a + <(>)
32
Frictional force encountered after commencement of motion is calleddynamic friction.
A
post friction
B
limiting friction
C
kinematic friction
D
frictional resistance
33
Limiting force of friction is theminimum force of friction.
A
tangent of angle between normal-reac-tion and the resultant of normal reac-tion and limiting friction
B
ratio of limiting friction and normal reaction
C
the friction force acting when the body is just about to move
D
the friction force acting when the body is in motion
34
On the ladder resting on the ground and leaning against a smooth vertical wall the force of friction will be
A
downwards at its upper end
B
upwards at its upper end
C
perpendicular to the wall at its upper end
D
zero at its upper end
35
The coefficient of friction depends onnature of surface
A
area of contact
B
shape of surfaces
C
strength of surfaces
D
nature of surface
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