4791 + Mcqs in Mechanical Engineering Page 45 McqOptions

2201.	According to lami's theorem
A.	the three forces must be equal
B.	the three forces must be at 120 to each other
C.	the three forces must be in equilibrium
D.	if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
Answer» E.

Discussion

2202.	Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is __________ than that about X-X axis.
A.	two times
B.	same
C.	half
Answer» B. same

Discussion

2203.	The amplitude is always __________ radius of the circle.
A.	equal to
B.	less than
C.	greater than
Answer» B. less than

Discussion

2204.	When a body falls freely under gravitational force, it possesses __________ weight.
A.	no
B.	minimum
C.	maximum
Answer» B. minimum

Discussion

2205.	The kinetic energy of a body __________ upon its mass and velocity.
A.	does not depend
B.	depends
Answer» C.

Discussion

2206.	The matter contained in a body, is called
A.	impulsive force
B.	mass
C.	weight
D.	momentum
Answer» C. weight

Discussion

2207.	If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.
A.	True
B.	False
Answer» B. False

Discussion

2208.	If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.
A.	equal to
B.	less than
C.	greater than
Answer» B. less than

Discussion

2209.	The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplaner non-concurrent forces.
A.	Agree
B.	Disagree
Answer» B. Disagree

Discussion

2210.	A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:
A.	both the balls undergo an equal change in momentum
B.	the change in momentum suffered by rubber ball is more than the lead ball
C.	the change in momentum suffered by rubber ball is less than the lead ball
D.	none of the above
Answer» C. the change in momentum suffered by rubber ball is less than the lead ball

Discussion

2211.	The potential energy stored by a spring in compression, is called strain energy.
A.	Yes
B.	No
Answer» B. No

Discussion

2212.	The moment of a force
A.	is the turning effect produced by a force, on the body, on which it acts
B.	is equal to the product of force acting on the body and the perpendicular distance of a point and the line of action of the force
C.	is equal to twice the area of the traingle, whose base is the line representing the force and whose vertex is the point, about which the moment is taken
D.	all of the above
Answer» E.

Discussion

2213.	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 50 mm. The velocity ratio is
A.	50
B.	100
C.	150
D.	200
Answer» C. 150

Discussion

2214.	If the resultant of a number of forces acting on a body is zero, then the body will not be in equilibrium.
A.	Yes
B.	No
Answer» C.

Discussion

2215.	The friction experienced by a body, when at rest, is known as
A.	static friction
B.	dynamic friction
C.	limiting friction
D.	coefficient of friction
Answer» B. dynamic friction

Discussion

2216.	The frequency of oscillation of a compound pendulum is(where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/46-262-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/46-262-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/46-262-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/46-262-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/engineering-mechanics/46-262-4.png">

Discussion

2217.	If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.
A.	directly
B.	inversely
Answer» B. inversely

Discussion

2218.	The total motion possessed by a body, is called
A.	impulsive force
B.	mass
C.	weight
D.	momentum
Answer» E.

Discussion

2219.	The wheels of a moving car possess
A.	potential energy only
B.	kinetic energy of translation only
C.	kinetic energy of rotation only
D.	kinetic energy of translation and rotation both
Answer» E.

Discussion

2220.	In order to determine the effects of a force, acting on a body, we must know
A.	magnitude of the force
B.	line of action of the force
C.	nature of the force i,e. whether the force is push or pull
D.	all of the above
Answer» E.

Discussion

2221.	The negative acceleration is called retardation.
A.	True
B.	False
Answer» B. False

Discussion

2222.	A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

2223.	Non-coplaner non-concurrent forces are those forces which
A.	meet at one point, but their lines of action do not lie on the same plane
B.	do not meet at one point and their lines of action do not lie on the same plane
C.	do not meet at one point but their lines of action lie on the same plane
D.	none of the above
Answer» C. do not meet at one point but their lines of action lie on the same plane

Discussion

2224.	A screw jack used for lifting the loads is
A.	a reversible machine
B.	a non-reversible machine
C.	an ideal machine
D.	none of these
Answer» C. an ideal machine

Discussion

2225.	According to Newton's first law of motion,
A.	every body continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
B.	the rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
C.	to every action, there is always an equal and opposite reaction
D.	none of the above
Answer» B. the rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

Discussion

2226.	A force while acting on a body may
A.	change its motion
B.	balance the forces, already acting on it
C.	give rise to the internal stresses in it
D.	all of these
Answer» E.

Discussion

2227.	A pendulum which executes one beat per second is known as
A.	simple pendulum
B.	compound pendulum
C.	torsional pendulum
D.	second's pendulum
Answer» E.

Discussion

2228.	The velocity ratio of a single purchase crab winch can be increased by
A.	increasing the length of the handle
B.	increasing the radius of the load drum
C.	increasing the number of teeth of the pinion
D.	all of the above
Answer» B. increasing the radius of the load drum

Discussion

2229.	The motion of a wheel of a car is
A.	purely translation
B.	purely rotational
C.	combined translation and rotational
D.	none of these
Answer» D. none of these

Discussion

2230.	The unit of angular velocity is
A.	m/min
B.	rad/s
C.	revolutions/min
D.	both (B) and (C)
E.	none of these
Answer» E. none of these

Discussion

2231.	Joule is the unit of
A.	force
B.	work
C.	power
D.	velocity
Answer» C. power

Discussion

2232.	D' Alembert's principle basically depends upon Newton's second law of motion.
A.	Correct
B.	Incorrect
Answer» B. Incorrect

Discussion

2233.	The forces, whose lines of action are parallel to each other and act in the same directions, are known as
A.	coplaner concurrent forces
B.	coplaner non-concurrent forces
C.	like parallel forces
D.	unlike parallel forces
Answer» D. unlike parallel forces

Discussion

2234.	The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as
A.	coplaner concurrent forces
B.	coplaner non-concurrent forces
C.	like parallel forces
D.	unlike parallel forces
Answer» E.

Discussion

2235.	The slope on the road surface generally provided on the curves is known as
A.	angle of friction
B.	angle of repose
C.	angle of banking
D.	none of these
Answer» D. none of these

Discussion

2236.	The time of flight of a projectile on downward inclined plane depends upon
A.	angle of projection
B.	angle of inclination of the plane
C.	both (a) and (b)
D.	none of these
Answer» D. none of these

Discussion

2237.	The efficiency of a lifting machine is the ratio of
A.	output to the input
B.	work done by the machine to the work done on the machine
C.	mechanical advantage to the velocity ratio
D.	all of the above
Answer» E.

Discussion

2238.	Coplaner non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.
A.	meet
B.	do not meet
Answer» C.

Discussion

2239.	Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-93-2.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-93-3.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-93-4.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/31-93-5.png">
Answer» B. <img src="/_files/images/mechanical-engineering/engineering-mechanics/31-93-3.png">

Discussion

2240.	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
Answer» B. False

Discussion

2241.	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.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/37-161-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/37-161-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/37-161-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/37-161-4.png">
Answer» E.

Discussion

2242.	The length of a second's pendulum is
A.	94.9cm
B.	99.4cm
C.	100cm
D.	101cm
Answer» C. 100cm

Discussion

2243.	The acceleration of a particle moving with simple harmonic motion is proportional to the displacement of the particle from the mean position.
A.	True
B.	False
Answer» B. False

Discussion

2244.	Coefficient of friction depends upon
A.	area of contact only
B.	nature of surface only
C.	both (a) and (b)
D.	none of these
Answer» C. both (a) and (b)

Discussion

2245.	The cartesian equation of trajectory is(where u = Velocity of projection, = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)
A.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-216-1.png">
B.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-216-2.png">
C.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-216-3.png">
D.	<img src="/_files/images/mechanical-engineering/engineering-mechanics/42-216-4.png">
Answer» D. <img src="/_files/images/mechanical-engineering/engineering-mechanics/42-216-4.png">

Discussion

2246.	In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.
A.	True
B.	False
Answer» B. False

Discussion

2247.	For any system of coplaner forces, the condition of equilibrium is that the
A.	algebraic sum of the horizontal components of all the forces should be zero
B.	algebraic sum of the vertical components of all the forces should be zero
C.	algebraic sum of moments of all the forces about any point should be zero
D.	all of the above
Answer» E.

Discussion

2248.	The ratio of static friction to dynamic friction is always
A.	equal to one
B.	less than one
C.	greater than one
D.	none of these
Answer» D. none of these

Discussion

2249.	One kg force is equal to
A.	7.8 N
B.	8.9 N
C.	9.8 N
D.	12 N
Answer» D. 12 N

Discussion

2250.	A science teacher claimed that Newton's third law of motion is involved while studying the motion of rockets. His statement is
A.	justified
B.	not justified
Answer» B. not justified

Discussion

Explore topic-wise MCQs in Engineering.

According to lami's theorem

Moment of inertia of a hollow circular section, as shown in the below figure about an axis perpendicular to the section, is __________ than that about X-X axis.

The amplitude is always __________ radius of the circle.

When a body falls freely under gravitational force, it possesses __________ weight.

The kinetic energy of a body __________ upon its mass and velocity.

The matter contained in a body, is called

If three forces acting at a point be represented in magnitude and direction by the three sides of a triangle, taken in order, the forces shall be in equilibrium.

If a number of coplaner forces acting at a point be in equilibrium, the sum of clockwise moments must be __________ the sum of anticlockwise moments, about any point.

The forces, which do not meet at one point, but their lines of action lie on the same plane, are known as coplaner non-concurrent forces.

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

The potential energy stored by a spring in compression, is called strain energy.

The moment of a force

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 50 mm. The velocity ratio is

If the resultant of a number of forces acting on a body is zero, then the body will not be in equilibrium.

The friction experienced by a body, when at rest, is known as

The frequency of oscillation of a compound pendulum is(where kG = Radius of gyration about the centroidal axis, and h = Distance between the point of suspension and C.G. of the body.)

If the efficiency of a lifting machine is kept constant, its velocity ratio is __________ propotional to its mechanical advantage.

The total motion possessed by a body, is called

The wheels of a moving car possess

In order to determine the effects of a force, acting on a body, we must know

The negative acceleration is called retardation.

A lifting machine lifts a load of 1000N through a distance of 0.2 m by means of an effort of 200N through a distance of 1m. This machine is an ideal one.

Non-coplaner non-concurrent forces are those forces which

A screw jack used for lifting the loads is

According to Newton's first law of motion,

A force while acting on a body may

A pendulum which executes one beat per second is known as

The velocity ratio of a single purchase crab winch can be increased by

The motion of a wheel of a car is

The unit of angular velocity is

Joule is the unit of

D' Alembert's principle basically depends upon Newton's second law of motion.

The forces, whose lines of action are parallel to each other and act in the same directions, are known as

The three forces of 100 N, 200 N and 300 N have their lines of action parallel to each other but act in the opposite directions. These forces are known as

The slope on the road surface generally provided on the curves is known as

The time of flight of a projectile on downward inclined plane depends upon

The efficiency of a lifting machine is the ratio of

Coplaner non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.

Moment of inertia of a hollow rectangular section as shown in the below figure about X-X axis, is

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.

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

The length of a second's pendulum is

The acceleration of a particle moving with simple harmonic motion is proportional to the displacement of the particle from the mean position.

Coefficient of friction depends upon

The cartesian equation of trajectory is(where u = Velocity of projection, = Angle of projection, and x, y = Co-ordinates of any point on the trajectory after t seconds.)

In collision of elastic bodies, the coefficient of restitution is the ratio of the relative velocity after impact to the relative velocity before impact.

For any system of coplaner forces, the condition of equilibrium is that the

The ratio of static friction to dynamic friction is always

One kg force is equal to

A science teacher claimed that Newton's third law of motion is involved while studying the motion of rockets. His statement is