4

n/2

n

n - 1

n(n - 1)/2

D. n(n - 1)/2

4

ωx

ω²x

ω²/x

ω³/x

4

# The example of successfully constrained motion is a

Motion of an I.C. engine valve

Motion of the shaft between a footstep bearing

Piston reciprocating inside an engine cylinder

All of the above

4

Equal to 1

Less than 2

Equal to 2

Greater than 2

4

ω₁.ω₂.r

(ω₁ - ω₂)r

(ω₁ + ω₂)r

(ω₁ - ω₂)2r

4

Zero

Minimum

Maximum

None of these

4

2ECS

ECS/2

2ECS²

2E²CS

4

# Which of the following statement is correct?

The primary unbalanced force is less than the secondary unbalanced force.

The primary unbalanced force is maximum twice in one revolution of the crank.

The unbalanced force due to reciprocating masses varies in magnitude and direction both.

The magnitude of swaying couple in locomotives is inversely proportional to the distance between the two cylinder centre lines

4

# The gear train usually employed in clocks is a

Simple gear train

Reverted gear train

Sun and planet gear

Differential gear

4

# The Klein's diagram is used when

Crank has uniform angular velocity

Crank has nonuniform angular velocity

Crank has uniform angular acceleration

Crank has nonuniform angular acceleration

4

Pitch circle

Base circle

Pitch curve

Prime circle

4

# The fundamental equation for correct steering is (where φ and α = Angle through which the axis of the outer wheel and inner wheel turns respectively, c = Distance between the pivots of the front axles, and d = Wheel base)

sinφ + sinα = b/c

cosφ - sinα = c/b

cotφ - cotα = c/b

tanφ + cotα = b/c

4

Slow speed

Moderate speed

Highs peed

Any one of these

4

Sliding pairs

Turning pairs

Rolling pairs

Higher pairs

4

# The partial balancing of reciprocating parts in locomotives produces

Hammer blow

Swaying couple

Variation in tractive force along the line of stroke

All of the above

4

# The power from the engine to the rear axle of an automobile is transmitted by means of

Worm and worm wheel

Spur gears

Bevel gears

Hooke's joint

4

# Under logarithmic decrement, the amplitude of successive vibrations are

Constant

In arithmetic progression

In geometric progression

In logarithmic progression

4

# Which gear is used for connecting two coplanar and intersecting shafts?

Spur gear

Helical gear

Bevel gear

None of the above

4

A single plane

Two planes

Three planes

Four planes

4

# Sense of tangential acceleration of a link

Is same as that of velocity

Is opposite to that of velocity

Could be either same or opposite to velocity

Is perpendicular to that of velocity

4

# Angle of descent of cam is defined as the angle

During which the follower returns to its initial position

Of rotation of the cam for a definite displacement of the follower

Through which the cam rotates during the period in which the follower remains in the highest position

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

4

# When the pitching of a ship is upward, the effect of gyroscopic couple acting on it will be

To move the ship towards starboard

To move the ship towards port side

To raise the bow and lower the stern

To raise the stern and lower the bow

4

# The Bifilar suspension method is used to determine

Natural frequency of vibration

Position of balancing weights

Moment of inertia

Centripetal acceleration

4

# A foot step bearing and rotor of a vertical turbine form examples of

Incompletely constrained motion

Partially constrained motion

Completely constrained motion

Successfully constrained motion

4

# Which type of gearing is used in steering system of an automobile?

Rack and pinion

Worm and wheel

Spiral gears

None of the above

4

# The static balancing is satisfactory for low speed rotors but with increasing speeds, dynamic balancing becomes necessary. This is because, the

Unbalanced couples are caused only at higher speeds

Unbalanced forces are not dangerous at higher speeds

Effects of unbalances are proportional to the square of the speed

Effects of unbalances are directly proportional to the speed

4

fn/2

2 fn

4 fn

8 fn

4

# In a hydrodynamic journal bearing, there is

A very thin film of lubricant between the journal and the bearing such that there is contact between the journal and the bearing

A thick film of lubricant between the journal and the bearing

No lubricant between the journal and the bearing

A forced lubricant between the journal and the bearing

4

# In a reciprocating steam engine, when the crank has turned from inner dead centre through an angle θ, the angular velocity of the connecting rod is given by

ω sinθ/(n² - sin²θ)1/2

ω cosθ/(n² - cos²θ)1/2

ω sinθ/(n² - cos²θ)1/2

ω cosθ/(n² - sin²θ)1/2

4

# The equation of motion for a vibrating system with viscous damping is (d²x/dt²) + (c/m). (dx/dt) + (s/m). x = 0 If the roots of this equation are real, then the system will be

Over-damped

Under damped

Critically damped

Without vibrations