Incline Plane
Q1. The maximum frictional force, which comes into play, when body just
begins to slide over the surface of the other body, is known as
(a) Static friction
(c) Limiting friction
(b)
(d)
Dynamic friction
Coefficient of friction
Q2. The ratio of static friction to dynamic friction is always
(a) Equal to one
(c) Later than one
(b) Less than one
(d) None of these
Q3. The angle which the normal reaction makes with the resultant reaction is
called angle of friction.
(a) Agree
(b) Disagree
Q4. The angle of inclination of the plane at which the body begins to move
down the plane, is called
(a) Angle of friction
(c) Angle of projection
(b) Angle of repose
(d) None of these
Q5. In law of dry friction, frictional force bears a constant of proportionality
to normal reaction.
a) True.
b) False.
Q6. A body will begin to move down an inclined plane if the angle of inclination of
the plane is ……….. the angle of friction.
(a) Equal to
(b) Less then
(c) Greater than
Q7. Limiting friction is due to interlocking of small projections in form of
hills and valleys over the mating surfaces, which slide over each other.
a) True.
b) False.
Q8. Coefficient of friction is the ratio of the limiting friction to the normal
reaction between the two bodies.
(a) Yes
(b) No
Q9. Coefficient of friction depends upon
(a) Area of contact only
(b) Nature of surface only
(c) Both (a) and (b)
(d) None of these
Q10. When a cylinder rolls over a horizontal surface the application of
frictional force is in which direction.
a) In the direction of motion.
b) Opposite to the direction of motion.
Q11.Which of the following will have highest value of coefficient of friction
when sliding over aluminium surface.
a) Wood.
b) Steel.
c) Aluminium.
Q12.Kinetic friction is always less than limiting friction.
a) True.
b) False.
Screw Jack
Q1. In a screw jack, the effort required to lift the load is given by
(a)
(b)
(c)
(d)
P=W tan (α-Ø)
P=W tan (α +Ø)
P= W tan (Ø-α)
P= W cos (α +Ø)
Q2. In a screw jack, the effort required to lower the load is ……………. the
effort required to raise the same load.
(a)
(b)
(c)
Less than
Equal to
More than
Q3. Efficiency of a screw jack is given by
(a) tan (α +Ø)
tan α
(b)
tan α
tan (α +Ø)
(c)
tan (α -Ø)
tan α
(d)
tan α
tan (α -Ø)
Q4. An ideal machine is one whose efficiency is
(a)
(c)
between 60 and 70%
between 80 and 90%
(b)
(d)
between 70 and 80%
100%
Q5. The mechanical advantage of a lifting machine is the ratio of
(a) distance moved by effort to the distance moved by load
(b) load lifted to the effort applied
(c) output to the input
(d) all the above
Q6. A screw jack used for lifting the loads is
(a)
(c)
a reversible machine
ideal machine
(b)
(d)
a non-reversible machine
none of these
Q7. The efficiency of a lifting machine is the ratio of
(a)
(b)
(c)
(d)
output to the input
work done by the machine to the work done on the machine
mechanical advantage to the velocity ratio
all the above
Q8. If the efficiency of a lifting machine is kept constant, its velocity ratio is
………… proportional to its mechanical advantage.
(a)
directly
(b)
inversely
Q9. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity
ratio is 20, the machine is
(a)Reversible
(b) Non-reversible
(c) Ideal
Truss
Q1. All the steel trusses of the bridges have one of their end roller supported,
and other end hinged. The main advantage of such a support is that the truss
remains stable.
(a)
True
(b)
False
Q2. A framed structure is perfect, if the numbers of members are ………….
(2j-3), where j is the number of joints.
(a) equal to (b)
less than
(c)
greater than (d) either (b) or (c)
Q3. A redundant frame is also called ……….. frame.
(a)
perfect
(b)
imperfect
(c)
deficient
Q4.The members of a truss are straight ……… force members.
a) One force
b) Two force
c) Three force
d) Four force
Q5. When the truss satisfy the equation m+3=2j it means.
a) Statically determinate
b) Statically indeterminate
c) Collapsible
d) Under rigid
Q6. A framed structure is imperfect, if the numbers of members are …………. (2j-3).
(a) equal to (b) less than
(c) greater than
Q7.Forces acting in each member of a truss are.
a) Compressive , tensile force.
b) Tensile, shear force.
c) Shear, bending force.
d) Compressive, shear force
(d) either b or c
Wheel & Axle
Q1. The velocity ratio of a differential wheel and axle with D as the diameter
of effort wheel and d1 and d2 as the diameters of larger and smaller axles
respectively, is
(a)
D
(b)
d1 + d2
D
d1 - d2
(c)
2D
d1+ d2
(d)
2D
d1- d2
Q2. A differential pulley block has larger and smaller diameters of 100mm
and 80mm respectively. Its velocity ratio is
(a)
5
(b)
10
(c)
20
(d)
40
Q3. In wheel and axle mechanical advantage is defined as.
(a) Ratio of load lifted to effort applied.
(b) Ratio of effort applied to load lifted.
(c) Ratio of distance moved by effort to the distance moved by load.
(d) Ratio of distance moved by load to distance moved by effort.
Q4.Efficiency of differential axle is defined as.
(a) Ratio of V.R/ M.A.
(b) Ratio of M.A/ V.R.
(c) Product of M.A&V.R.
(d) Equal to M.A.
.
Q5. For a self locking machine, the efficiency must be
(a) equal to 50% (b) less than 50%
(c)
greater than 50%
(d) 100%
Q6. A machine which is capable of doing work in the reversed direction, after
the effort is removed, is called a non-reversible machine.
(a)
Yes
(b)
No
Q7. A machine having an efficiency greater than 50%, is known as
(a)
(c)
(d)
reversible machine (b)
non-reversible machine
nether reversible nor non-reversible machine
ideal machine
Q8. In ideal machines, mechanical advantage is …………. velocity ratio.
(a)
equal to
(b)
less than
(c)
greater than
Q9. A lifting machine lifts a load of 1000N through a distance of 0.2 m by
means of a effort of 200N through a distance of 1m. This machine is an ideal
one.
(a)
Right
(b)
Wrong
Q10. A machine having an efficiency less than 50%, is known as
(a)
(c)
(d)
reversible machine (b)
non-reversible machine
nether reversible nor non-reversible machine
ideal machine
Q11. Differential axle is made of.
(a) Single axle.
(b) More than one axle.
Q12. On differential axle, the string wounds and unwounds on the axle at
same time.
(a) True .
(b) False.
Universal Force Table
Q1. The Polygon law of forces states that if a number of forces, acting
simultaneously on a particle, be represented in magnitude and direction by
the sides of a polygon taken in order, then the resultant is represented in
magnitude and direction by the closing side of the polygon, taken in opposite
direction.
(a). Correct
(b). Incorrect
Q2. Concurrent forces are those forces whose line of action
(a). lie on the same line
(b). meet at one point
(c). meet on the same plane
(d). none of these
Q3. If more than two forces are acting at a point, then for finding the
resultant, law of----- can be used
a) Parallelogram
b) Triangle
c) Both
d) None
Q4. Law of polygon can be used for -----.
a)
b)
c)
d)
3 forces
4 forces
5 forces
All
Q5. If n numbers of forces are acting at a point, in a polygon-by-polygon law
no. Of sides of polygon are
a) n
b) 2n
c) n-1
d) n+1
Q6. Two forces of magnitude 5N each and angle between
Them is 120°, resultant can be calculated by law of,
a) Parallelogram
b) Triangle
c) Both
Q7. At a point 30 forces are acting on a body, resultant can be found by law
of------------forces
a) Parallelogram
b) Triangle
c) Both
d) None
Q8. If the body is in equilibrium minimum no. of forces acting on it are.
a)
b)
c)
d)
0
1
2
3
Q9. Magnitude of resultant of two forces does not depends upon
a)
b)
c)
d)
Magnitude of two forces
Angle between two forces
Both
None
Bell crank lever
Q1. The moment of a force is
a) Turning effect produced by force
b) Equal to the product of force and perpendicular distance of
a point and a line of action of the force.
c) Equal to twice the area of a triangle, whose base is the line
representing the force and vertex is the point about which
the moment is taken?
d) All the above
Q2. If a body is acted upon by a number of coplanar forces, it
may
(a) Rotate about itself with moving
(b) Move in any one direction rotating about itself
(c) Be completely at rest
(d) All of above
Q3. Moment of force depends upon
(a) Magnitude of force
(b) Distance of point of application from fixed point.
(c) Both the above
(d) None of the above
Q4. A couple produces
(a) Translatory motion
(b) Rotational motion
(c) Combined translatory and rotational motion
(d) None
Q5. Effect of the force on the body depends upon.
(a) Magnitude
(b) Direction
(c) Position or line of action
(d) All of the above
Q6. A force is completely defined by
(a) Magnitude
(b) Direction
(c) Point of application
(d) All of the above
Q7. The weight of the body is due to
(a) Centripetal force of earth
(b) Gravitational pull exerted by earth
(c) Force experienced by body in atmosphere
(d) Gravitational force of attraction towards the center of the
earth.
Q8. The force, which meet at one point, but their lines of action do
not lie in a plane, are called
(a) Coplanar non-concurrent forces
(b) Non-coplanar concurrent forces
(c) Non-coplanar non-concurrent forces
(d) Intersecting forces.
Q10. The point through which the weight of whole body acts
is known as
(a) Moment of inertia
(b) Centre of gravity
(c) Centre of percussion
(d) Centre of mass
SIMPLY SUPPORTED BEAM
Q1. The reaction at the roller supported end of a beam is always
a) Vertical
b) Horizontal
c) None of the above
Q2. If the reaction of a beam, at one of its supports is the resultant
of horizontal and vertical forces, then it is a
a) Simply Supported End
b) Roller Supported End
c) Hinged End
Q3. A couple acting at the mid-point of a simply supported beam has
some horizontal and vertical components.
a) Agree
b) Disagree
Q4. Effect of force is to bring the body in-------motion.
(a) Linear
(b) Rotational
(c) Both
(d) None
Q5. The moment of a force is turning effect produced by force
(a) True
(b) False
Q6. Moment of force depends upon distance of point of application
from fixed point only.
(a) True
(b) False
Q7. Effect of force is to bring the body in linear motion always.
(a) True
(b) False
Q8. The process of finding out the resultant force is called
(a) Composition
(b) Resolution
Q9. Moment of inertia is the
(a) second moment of force
(c) second moment of mass
(b) second moment of area
(d) all
Q10. The units of moment of inertia of an area is
2
2
2
4
(a) kg-m (b) kg-m-s (c) kg/ m (d) m
Q11. “Kgf” is the ----------unit of force in---------system
(a) gravitational, M.K.S.
(b) gravitational, S.I.
(c) absolute, M.K.S.
(d) absolute, S.I.
Q12. “Newton” is the ----------unit of force in--------- system
(a) gravitational, M.K.S.
(b) gravitational, S.I.
(c) absolute, M.K.S.
(d) absolute, S.I.
Q13. Moment of force about an axis indicates
(a) turning tendency of body about that axis
(b) translatory tendency of body about that axis
(c) moving tendency of body away from that axis
(d) none of the above
Q14. Moment of force about a point can be represented by
(a) area of triangle
(b) area of quadrilateral
(c) twice the area of the triangle
(d) none of the above
Q15. Varignon’s theorem is applicable only to
(a) coplanar concurrent forces
(b) coplanar non-concurrent forces
(c) both of the above
(d) forces lying in different planes.
JIB CRANE
Q1. Forces whose lines of action pass through a common point are called
________.
Q2. __________ forces are those forces which act along the same line either in
the same or opposite direction.
Q3. Concurrent forces always lie in the same plane (True/False).
Q4. Tension acts opposite to the external force (True/False).
Q5. Lami’s Theorem is applicable only to three concurrent co-plane forces
(True/False).
Q6. By using jib crane we can verify.
(a) At what angle the forces are acting.
(b) What is the nature and magnitude of forces.
(c) Only the magnitude of forces.
(d) Only the nature of forces.
(e)
Q7. For Lami’s theorem forces should be Coplanar non-concurrent
(a) True
(b) False
Q8. For Lami’s theorem resultant of three forces should be less than one.
(a) True
(b) False
Q9. Under the action of two forces, if both forces balance each other then
body is at rest.
(a) True
(b) False
Q10. Forces are called concurrent when their lines of action meet at one point
(a) True
(b) False
WORM AND WORM WHEEL
Q1. In worm and worm wheel, the axes of gears are.
(a) Perpendicular to each other.
(b) Parallel to each other.
Q2.What do one understand by term mechanical advantage.
(a) Ratio of load lifted to effort applied.
(b) Ratio of effort applied to load lifted.
(c) Ratio of distance moved by effort to the distance moved by
load.
(d) Ratio of distance moved by load to distance moved by effort.
Q3. In a simple machine can the mechanical advantage be less than unity.
(a) Yes.
(b) No.
Q4 . What do one understand by the term velocity ratio.
(a) Ratio of load lifted to effort applied.
(b) Ratio of effort applied to load lifted.
(c) Ratio of distance moved by effort to the distance moved by load.
(d) Ratio of distance moved by load to distance moved by effort.
Q5 .Worm is a form of.
(a) Helical gear.
(b) Spur gear.
(c) Spiral gear.
(d) Bevel gear.
Q6. Worm wheel is a form of.
(a) Helical gear.
(b) Spur gear.
(c) Spiral gear.
(d) Bevel gear.
Q7. What is the condition of a simple machine to be reversible.
(a) Efficiency more than 50%.
(b) Efficiency less than 50%.
Q8. Self locking machines are also known as.
(a) Reversible machines.
(b) Non reversible machines.
Q9. Efficiency of ideal machines is.
(a) 50%.
(b) 25%.
(c) 100%.
(d) 75%.
Q10. Efficiency of simple machines is represented as.
(a) Ratio of V.R/ M.A.
(b) Ratio of M.A/ V.R.
(c) Product of M.A&V.R.
(d) Equal to M.A.
Q11. In simple machine heavy load can be lifted by application of a small
effort.
(a). True.
(b). False
Q. The Law of the machine is
(a)
P=mW-C
where
(b)
P=m/W+C
(c)
P=mW+c
P=C-mW
P= Effort applied to lift the load,
m= A constant which is equal to the slope of the line,
W= Load lifted , and
C= Another constant, which represents the machine friction.
Q. If the number of pulleys in a system is equal to its velocity ratio, then it is a
………… system of pulleys
(a)
first
(b)
second
(c)
third
Q. In a single threaded worm and worm wheel, the number of teeth on the worm is
50. The diameter of the effort wheel is 100 mm and that of load drum is 50mm. The
velocity ratio is
(a)
50
(b)
100
(c)
150
(d)
200
Q. In a wormed geared pulley block, if the number of teeth on the worm wheel is
doubled, then its velocity ratio is also doubled.
(a)
True
(b)
False