In a locomotive, the ratio of the connecting rod length to the crank radius is kept very large in order to

minimize the effect of primary forces

minimize the effect of secondary forces

start the locomotive conveniently

Which of the following statements is correct about the balancing of a mechanical system?

if it is under static balance, then there will be dynamic balance also

if it is under dynamic balance, then there will be static balance also

both static as well as dynamic balance have to be achieved separately

For high speed engines, the cam follower should move with

uniform acceleration and retardation

For low and moderate speed engines, the cam follower should move with

uniform acceleration and retardation

A radial follower is one

that reciprocates in the guides

in which the follower translates along an axis passing through the cam centre of rotation.

In a radial cam, the follower moves

in a direction parallel to the cam axis

in a direction perpendicular to the cam axis

in a direction parallel to the cam axis

in any direction irrespective of the cam axis

The balance energy required for punching is supplied by the flywheel by

decrease in its potential energy

A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.

53.4 kn c) 13.35 kn d) 106.8 kn

For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.

work is done on the piston wall

work is done by the piston wall

Crank effort is the product of crank pin radius and

force acting along connecting rod

A body remains in equilibrium if

inertia force is applied in the direction perpendicular to the resultant force

inertia force is applied in the same direction to the resultant force

inertia force is applied in the direction opposite to the resultant force

inertia force is applied in the direction perpendicular to the resultant force

inertia force is applied in the direction parallel to the resultant force

D-Alembertâ€™s principle is used for which of the following?

to calculate moment of inertia of rigid bodies

change static problem into a dynamic problem

change dynamic problem to static problem

to calculate moment of inertia of rigid bodies

to calculate angular momentum of a system of masses

Which of the following is incorrect regarding inertia force?

same direction as of accelerating force

346 + Mcqs in Mechatronics in Mechanical Engineering Page 7 McqOptions

301.	In a locomotive, the ratio of the connecting rod length to the crank radius is kept very large in order to
A.	minimize the effect of primary forces
B.	minimize the effect of secondary forces
C.	have perfect balancing
D.	start the locomotive conveniently
Answer» C. have perfect balancing

Discussion

302.	Which of the following statements is correct about the balancing of a mechanical system?
A.	if it is under static balance, then there will be dynamic balance also
B.	if it is under dynamic balance, then there will be static balance also
C.	both static as well as dynamic balance have to be achieved separately
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

303.	Centre of masses of the system lies on the axis of rotation.
A.	1, 2, 3 and 4
B.	1, 2, and 3 only
C.	2, 3 and 4 only
D.	1, 3 and 4 only
Answer» E.

Discussion

304.	The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by
A.	Ï‰2Ã—oq
B.	Ï‰2Ã—oqsinÎ¸
C.	Ï‰2Ã—oqcosÎ¸
D.	Ï‰2Ã—oqtanÎ¸
Answer» B. Ï‰2Ã—oqsinÎ¸

Discussion

305.	The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by
A.	r(1-cosÎ¸)
B.	r(1-sinÎ¸)
C.	(r-r1)(1-cosÎ¸)
D.	(r-r1)(1-sinÎ¸)
Answer» D. (r-r1)(1-sinÎ¸)

Discussion

306.	Which of the following displacement diagrams should be chosen for better dynamic performance of a cam-follower mechanism ?
A.	simple hormonic motion
B.	parabolic motion
C.	cycloidal motion
D.	none of the mentioned
Answer» D. none of the mentioned

Discussion

307.	For high speed engines, the cam follower should move with
A.	uniform velocity
B.	simple harmonic motion
C.	uniform acceleration and retardation
D.	cycloidal motion
Answer» E.

Discussion

308.	For low and moderate speed engines, the cam follower should move with
A.	uniform velocity
B.	simple harmonic motion
C.	uniform acceleration and retardation
D.	cycloidal motion
Answer» C. uniform acceleration and retardation

Discussion

309.	The cam follower extensively used in air- craft engines is
A.	knife edge follower
B.	flat faced follower
C.	spherical faced follower
D.	roller follower
Answer» E.

Discussion

310.	Ofset is provided to a cam follower mechanism to
A.	minimise the side thrust
B.	accelerate
C.	avoid jerk
D.	none of the mentioned
Answer» B. accelerate

Discussion

311.	A radial follower is one
A.	that reciprocates in the guides
B.	that oscillates
C.	in which the follower translates along an axis passing through the cam centre of rotation.
D.	none of the mentioned
Answer» B. that oscillates

Discussion

312.	In a radial cam, the follower moves
A.	in a direction perpendicular to the cam axis
B.	in a direction parallel to the cam axis
C.	in any direction irrespective of the cam axis
D.	along the cam axis
Answer» B. in a direction parallel to the cam axis

Discussion

313.	The cam follower generally used in automobile engines is
A.	knife edge follower
B.	flat faced follower
C.	spherical faced follower
D.	roller follower
Answer» D. roller follower

Discussion

314.	The angle between the direction of the follower motion and a normal to the pitch curve is called
A.	pitch angle
B.	prime angle
C.	base angle
D.	pressure angle
Answer» E.

Discussion

315.	When the length of the connecting rod is unknown then the value (Î¸2 â€“Î¸1)/2Ï€ is equal to
A.	t/s
B.	t/2s
C.	t/2r
D.	t/r
Answer» C. t/2r

Discussion

316.	The size of a cam depends upon
A.	base circle
B.	pitch circle
C.	prime circle
D.	pitch curve
Answer» B. pitch circle

Discussion

317.	The balance energy required for punching is supplied by the flywheel by
A.	increase in its kinetic energy
B.	decrease in its kinetic energy
C.	decrease in its potential energy
D.	by variation of mass
Answer» C. decrease in its potential energy

Discussion

318.	Energy during actual punching operation is same as the energy supplied by the motor.
A.	true
B.	false
Answer» C.

Discussion

319.	If the stroke punch is 100mm, find the radius of the crank in mm.
A.	200
B.	100
C.	50 d) 400
Answer» D.

Discussion

320.	A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.
A.	26.7 kn
B.	53.4 kn c) 13.35 kn d) 106.8 kn
Answer» B. 53.4 kn c) 13.35 kn d) 106.8 kn

Discussion

321.	The maximum shear force required for punching depends on
A.	sheared area
B.	length of the plate
C.	speed of the flywheel
D.	total load
Answer» B. length of the plate

Discussion

322.	The relation between stroke punch s and radius of crank r is
A.	s=r
B.	s=2r
C.	s=4r
D.	s=r/2
Answer» C. s=4r

Discussion

323.	In a punching press, load is 0 at the time of punching.
A.	true
B.	false
Answer» C.

Discussion

324.	In a punching press, which of the following quantity is constant?
A.	load
B.	torque
C.	angular velocity
D.	angle of rotation
Answer» C. angular velocity

Discussion

325.	In the turning moment diagram of a multicylinder engine, the work done during exhaust stroke is by
A.	the gases
B.	on the gases
C.	piston wall
D.	valve
Answer» C. piston wall

Discussion

326.	For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.
A.	work is done by the gases
B.	work is done on the gases
C.	work is done on the piston wall
D.	work is done by the piston wall
Answer» B. work is done on the gases

Discussion

327.	For a multicylinder engine, the coefficient of fluctuation of speed would vary with
A.	number of cylinders
B.	remains unaffected
C.	length of connecting rod
D.	input temperature
Answer» C. length of connecting rod

Discussion

328.	Multi cylinder engines are usually placed at an equal inclination to each other.
A.	true
B.	false
Answer» B. false

Discussion

329.	45 N/mm2. The connecting rod length between centres is 1.2 m and the cylinder bore is 0.5 m. If the engine runs at 250 r.p.m. and if the effect of piston rod diameter is neglected, calculate the net load on piston.
A.	88000 n
B.	90560 n
C.	78036 n
D.	88357 n
Answer» E.

Discussion

330.	For the given data of an Internal combustion engine : Mass of parts = 180 kg bore = 175 mm, length of stroke = 200 mm, engine speed = 500 r.p.m., length of connecting rod = 400 mm and crank angle = 60Â° from T.D.C, find the inertia force.
A.	17.56 n
B.	19.2 n
C.	18.53 n
D.	18.00 n
Answer» D. 18.00 n

Discussion

331.	In a horizontal engine, the weight of the reciprocating parts also add/subtract to the piston effort.
A.	true
B.	false
Answer» C.

Discussion

332.	When the piston is accelerated, the piston effort is given by which of the following the equation?
A.	f(l) â€“ f(i)
B.	f(l) + f(i)
C.	f(l) Â± f(i)
D.	f(l) â€“ f(i) + r(f)
Answer» C. f(l) Â± f(i)

Discussion

333.	Crank effort is the product of crank pin radius and
A.	thrust on sides
B.	crankpin effort
C.	force acting along connecting rod
D.	piston effort
Answer» C. force acting along connecting rod

Discussion

334.	In the presence of frictional resistance, the expression for piston effort is
A.	f(l) â€“ f(i)
B.	f(l) + f(i)
C.	f(l) Â± f(i) â€“ r(f)
D.	f(l) â€“ f(i) + r(f)
Answer» D. f(l) â€“ f(i) + r(f)

Discussion

335.	In a horizontal engine, reciprocating parts are retarded when the piston moves from
A.	tdc to bdc
B.	bdc to tdc
C.	midway to tdc
D.	bdc to midway
Answer» C. midway to tdc

Discussion

336.	In a horizontal engine, reciprocating parts are accelerated when the piston moves from
A.	tdc to bdc
B.	bdc to tdc
C.	midway to tdc
D.	bdc to midway
Answer» B. bdc to tdc

Discussion

337.	Piston effort acts along the line of stroke.
A.	true
B.	false
Answer» B. false

Discussion

338.	In the following picture the G is the center of gravity, the quantity h is known as the â€œoffsetâ€. I is the moment of inertia and k is the radius of gyration. Offsetâ€™s value is given by?
A.	i.Î±/f
B.	i.Î±/m.g
C.	i/m.k
D.	m.k/i
Answer» B. i.Î±/m.g

Discussion

339.	Considering a four bar chain with each link having linear and angular acceleration, applying D-Alembertâ€™s principle will never result in which of the following member?
A.	2- force member
B.	3- force member
C.	4 â€“ force member
D.	non accelerating member
Answer» B. 3- force member

Discussion

340.	Inertia force and the reversed effective force are the same.
A.	true
B.	false
Answer» B. false

Discussion

341.	A body remains in equilibrium if
A.	inertia force is applied in the same direction to the resultant force
B.	inertia force is applied in the direction opposite to the resultant force
C.	inertia force is applied in the direction perpendicular to the resultant force
D.	inertia force is applied in the direction parallel to the resultant force
Answer» C. inertia force is applied in the direction perpendicular to the resultant force

Discussion

342.	D-Alembertâ€™s principle is used for which of the following?
A.	change static problem into a dynamic problem
B.	change dynamic problem to static problem
C.	to calculate moment of inertia of rigid bodies
D.	to calculate angular momentum of a system of masses
Answer» C. to calculate moment of inertia of rigid bodies

Discussion

343.	2 D ALEMBERT'S PRINCIPLE - DYNAMIC ANALYSIS IN RECIPROCATING ENGINES
A.	reversed effective force
B.	net force
C.	coriolis force
D.	resultant force
Answer» B. net force

Discussion

344.	If a force has a line of action at a distance h from the centre of gravity, then the value of h is given by
A.	i. Î±/f
B.	i. Î±/m.g
C.	i/m.k
D.	m.k/i
Answer» B. i. Î±/m.g

Discussion

345.	Which of the following is incorrect regarding inertia force?
A.	imaginary force
B.	acts upon a rigid body
C.	brings the body to equilibrium
D.	same direction as of accelerating force
Answer» E.

Discussion

346.	Inertia torque acts in the same direction as the accelerating couple?
A.	true
B.	false
Answer» C.

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

In a locomotive, the ratio of the connecting rod length to the crank radius is kept very large in order to

Which of the following statements is correct about the balancing of a mechanical system?

Centre of masses of the system lies on the axis of rotation.

The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by

The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by

Which of the following displacement diagrams should be chosen for better dynamic performance of a cam-follower mechanism ?

For high speed engines, the cam follower should move with

For low and moderate speed engines, the cam follower should move with

The cam follower extensively used in air- craft engines is

Ofset is provided to a cam follower mechanism to

A radial follower is one

In a radial cam, the follower moves

The cam follower generally used in automobile engines is

The angle between the direction of the follower motion and a normal to the pitch curve is called

When the length of the connecting rod is unknown then the value (Î¸2 â€“Î¸1)/2Ï€ is equal to

The size of a cam depends upon

The balance energy required for punching is supplied by the flywheel by

Energy during actual punching operation is same as the energy supplied by the motor.

If the stroke punch is 100mm, find the radius of the crank in mm.

A machine punching 38 mm holes in 32 mm thick plate requires 7 N-m of energy per sq. mm of sheared area, find the maximum shear force required.

The maximum shear force required for punching depends on

The relation between stroke punch s and radius of crank r is

In a punching press, load is 0 at the time of punching.

In a punching press, which of the following quantity is constant?

In the turning moment diagram of a multicylinder engine, the work done during exhaust stroke is by

For a 4 cylinder engine, when the pressure inside the cylinders exceeds the atmospheric pressure then.

For a multicylinder engine, the coefficient of fluctuation of speed would vary with

Multi cylinder engines are usually placed at an equal inclination to each other.

45 N/mm2. The connecting rod length between centres is 1.2 m and the cylinder bore is 0.5 m. If the engine runs at 250 r.p.m. and if the effect of piston rod diameter is neglected, calculate the net load on piston.

For the given data of an Internal combustion engine : Mass of parts = 180 kg bore = 175 mm, length of stroke = 200 mm, engine speed = 500 r.p.m., length of connecting rod = 400 mm and crank angle = 60Â° from T.D.C, find the inertia force.

In a horizontal engine, the weight of the reciprocating parts also add/subtract to the piston effort.

When the piston is accelerated, the piston effort is given by which of the following the equation?

Crank effort is the product of crank pin radius and

In the presence of frictional resistance, the expression for piston effort is

In a horizontal engine, reciprocating parts are retarded when the piston moves from

In a horizontal engine, reciprocating parts are accelerated when the piston moves from

Piston effort acts along the line of stroke.

In the following picture the G is the center of gravity, the quantity h is known as the â€œoffsetâ€. I is the moment of inertia and k is the radius of gyration. Offsetâ€™s value is given by?

Considering a four bar chain with each link having linear and angular acceleration, applying D-Alembertâ€™s principle will never result in which of the following member?

Inertia force and the reversed effective force are the same.

A body remains in equilibrium if

D-Alembertâ€™s principle is used for which of the following?

2 D ALEMBERT'S PRINCIPLE - DYNAMIC ANALYSIS IN RECIPROCATING ENGINES

If a force has a line of action at a distance h from the centre of gravity, then the value of h is given by

Which of the following is incorrect regarding inertia force?

Inertia torque acts in the same direction as the accelerating couple?

In the following picture the G is the center of gravity, the quantity h is known as the â€œoffsetâ€. I is the moment of inertia and k is the radius of gyration. Offsetâ€™s value is given by?