4

2

3

4

5

C. 4

4

Zero

Minimum

Maximum

None of these

4

# The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the length of connecting rod to radius of crank)

m.ω².r sinθ

m.ω².r cosθ

m.ω².r (sin 2θ/n)

m.ω².r (cos 2θ/n)

4

# Which of the following disciplines provides study of the relative motion between the parts of a machine and the forces acting on the parts?

Theory of machines

Applied mechanics

Mechanisms

Kinetics

4

# Cylindrical cams can be classified as

Circular

Tangent

Reciprocating

None of the above

4

# When there is a reduction in amplitude over every cycle of vibration, then the body is said to have

Free vibration

Forced vibration

Damped vibration

Under damped vibration

4

# For high speed engines, the cam follower should move with

Uniform velocity

Simple harmonic motion

Uniform acceleration and retardation

Cycloidal motion

4

2π. √(g/δ)

1/2π. √(g/δ)

2π. √(δ/g)

1/2π. √(δ/g)

4

Two forks

One fork

Three forks

Four forks

4

fn/2

2 fn

4 fn

8 fn

4

# The pair is known as a higher pair, when the relative motion between the elements of a pair is

Turning only

Sliding only

Rolling only

Partly turning and partly sliding

4

# In the below figure, PC is the connecting rod and OC is the crank making an angle θ with the line of stroke PO and rotates with uniform angular velocity at ω rad/s. The Klien's acceleration diagram for determining the acceleration of the piston P is shown by quadrilateral CQNO, if N coincides with O, then

Acceleration and velocity of the piston P is zero

Acceleration and velocity of the piston P is maximum

Acceleration of the piston P is zero and its velocity is maximum

Acceleration of the piston P is maximum and its velocity is zero

4

G.I₂

G².I₂

I₂/G

I₂/G²

4

# The motion between a pair when limited to a definite direction, irrespective of the direction of force applied, is known as

Completely constrained motion

Incompletely constrained motion

Successfully constrained motion

None of these

4

# The absolute acceleration of any point P in a link about center of rotation O is

Along PO

Perpendicular to PO

At 45° to PO

None of the above

4

# A motor car moving at a certain speed takes a left turn in a curved path. If the engine rotates in the same direction as that of wheels, men due to centrifugal forc

The reaction on me inner wheels increases and on the outer wheels decreases

The reaction on the outer wheels increases and on the inner wheels decreases

The reaction on the front wheels increases and on the rear wheels decreases

The reaction on the rear wheels increases and on the front wheels decreases

4

# Effort of a governor is the

Mean force exerted at the sleeve for a given percentage change of speed

Workdone at the sleeve for maximum equilibrium speed

Mean force exerted at the sleeve for maximum equilibrium speed

None of the above

4

# The critical speed of a shaft depends upon its

Mass

Stiffness

Mass and stiffness

Stiffness and eccentricity

4

# The unbalanced primary forces in a reciprocating engine are

Balanced completely

Balanced partially

Balanced by secondary forces

Not balanced

4

# A Hartnell governor is a

Pendulum type governor

Inertia governor

4

# Which of the following statement is wrong?

A round bar in a round hole form a turning pair

A square bar in a square hole form a sliding pair

A vertical shaft in a foot step bearing forms a successful constraint

All of the above

4

# Whirling speed of the shaft is the speed at which

Shaft tends to vibrate in longitudinal direction

Torsional vibrations occur

Shaft tends to vibrate vigorously in transverse direction

Combination of transverse and longitudinal vibration occurs

4

# A spring controlled governor is found unstable. It can be made stable by

Increasing the spring stiffness

Decreasing the spring stiffness

Increasing the ball mass

Decreasing the ball mass

4

Cylindrical pair

Turning pair

Rolling pair

Sliding pair

4

# A governor is said to be stable, if the

Radius of rotation of balls increases as the equilibrium speed decreases

Radius of rotation of balls decreases as the equilibrium speed decreases

Radius of rotation of balls increases as the equilibrium speed increases

Radius of rotation of balls decreases as the equilibrium speed increases

4

Lower pairs

Higher pairs

Rolling pairs

Turning pairs

4

2 W CE / CS

W CE / 2CS

W CE / CS

W CS / 2CE

4

Open pair

Kinematic pair

Sliding pair

None of these

4

Pitch circle

Base circle

Dedendum circle

4

# In an ideal machine, the output as compared to input is

Less

More

Equal

May be less or more depending on efficiency