4

Mass

Friction

Inertia

Resisting force

C. Inertia

4

# For simple harmonic motion of the of follower, a cosine curve represents

Displacement diagram

Velocity diagram

Acceleration diagram

All of the above

4

# When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a

Lower pair

Higher pair

Self-closed pair

Force-closed pair

4

# The unbalanced force due to revolving masses

Varies in magnitude but constant in direction

Varies in direction but constant in magnitude

Varies in magnitude and direction both

Constant in magnitude and direction both

4

4, 4

4, 5

5, 4

4, 6

4

ω₁.ω₂.r

(ω₁ - ω₂) r

(ω₁ + ω₂) r

(ω₁ - ω₂) 2r

4

ω √(x² - r²)

ω √(r² - x²)

ω² √(x² - r²)

ω² √(r² - x²)

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 the equation are __________ then the system will be under damped.

Equal

Real

Complex conjugate

None of these

4

# Cylindrical cams can be classified as

Circular

Tangent

Reciprocating

None of the above

4

# Which of the following statement is correct as regard to the difference between a machine and a structure?

The parts of a machine move relative to one another, whereas the members of a structure do not move relative to one another

The links of a machine may transmit both power and motion, whereas the members of a structure transmit forces only

A machine transforms the available energy into some useful work, whereas in a structure no energy is transformed into useful work

All of the above

4

Stable

Unstable

Isochronous

None of these

4

# The steering of a ship means

Movement of a complete ship up and down in vertical plane about transverse axis

Turning of a complete ship in a curve towards right or left, while it moves forward

Rolling of a complete ship sideways

None of the above

4

# Which of the following is used to control the speed variations of the engine caused by the fluctuations of the engine turning moment?

D-slide valve

Governor

Flywheel

Meyer's expansion valve

4

# Oldhams coupling is an inversion of the kinematic chain used in

Whitworth quick return mechanism

Elliptical trammels

Rotary engine

Universal joint

4

Structure

Mechanism

Kinematic chain

Inversion

4

# The pressure angle of a cam depends upon

Offset between centre lines of cam and follower

Lift of follower

Angle of ascent

All of the above

4

Turning pair

Rolling pair

Screw pair

Spherical pair

4

# A Hartnell governor has its controlling force (Fc) given by Fc = ar + b, where r is the radius of rotation and a and b are constants. The governor becomes isochronous when

a is +ve and b = 0

a = 0 and b is +ve

a is +ve and b is -ve

a is +ve and b is also +ve

4

# When the two elements of a pair have __________ when in motion, it is said to a lower pair.

Line or point contact

Surface contact

Body contact

None of these

4

1.4 N-s/m

18.52 N-s/m

52.92 N-s/m

529.2 N-s/m

4

# The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in

Transverse vibrations

Torsional vibrations

Longitudinal vibrations

All of these

4

No node

One node

Two nodes

Three nodes

4

# When two links are connected by a pin joint, their instantaneous centre lies

On their point of contact

At the centre of curvature

At the centre of circle

At the pin joint

4

# The mechanism consisting of three turning pairs and one sliding pair, is called a

Single slider crank chain

Whitworth quick return motion mechanism

Crank and slotted lever quick return motion mechanism

All of the above

4

# Which of the following is an open pair?

Ball and socket joint

Journal bearing

Cam and follower

4

Base circle

Pitch circle

Prime circle

Pitch curve

4

# Which of the following is an example of a higher pair?

Toothed gearing

Belt and rope drive

Ball and roller bearing

All of these

4

10°

20°

30°

40°

4

# Coriolis component acts

Perpendicular to sliding surfaces

Along sliding surfaces

Somewhere in between above two

None of the above

4

Bevel gear

Universal joint

Hooke's joint

Knuckle joint