4

3 Hz

3π Hz

6 Hz

6π Hz

A. 3 Hz

4

# A Porter governor is a

Pendulum type governor

Inertia governor

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

# The arrangement is called bevel gearing, when two __________ are connected by gears.

Intersecting and coplanar shafts

Nonintersecting and non-coplanar shafts

Parallel and coplanar shafts

Parallel and non-coplanar shafts

4

# An exact straight line motion mechanism is a

Scott-Russell's mechanism

Hart's mechanism

Peaucellier's mechanism

All of these

4

# The frictional torque transmitted by a disc or plate clutch is same as that of

Flat pivot bearing

Flat collar bearing

Conical pivot bearing

Truncated conical pivot bearing

4

# The displacement of a flat faced follower when it has contact with the flank of a circular arc cam, is given by (where R = Radius of flank, r₁ = Minimum radius of the cam, and θ = Angle turned through by the cam)

R (1 - cosθ)

(R - r₁) (1 - cosθ)

R (1 - sinθ)

(R - r₁) (1 - sinθ)

4

# The dedendum circle diameter is equal to (where, φ = Pressure angle)

Pitch circle dia. × cosφ

Clearance circle dia. × cosφ

Pitch circle dia. × sinφ

4

# The example of lower pair is

Shaft revolving in a bearing

Straight line motion mechanisms

Automobile steering gear

All of the above

4

# Whitworth quick return mechanism is obtained by inversion of

Slider crank mechanism

Kinematic chain

Roller cam mechanism

4

# To connect two parallel and coplanar shafts the following type of gearing is used

Spur gear

Bevel gear

Spiral gear

None of the above

4

Zero

Minimum

Maximum

None of these

4

# A typewriter mechanism has 7 numbers of binary joints, six links and none of higher pairs. The mechanism is

Kinematically sound

Not sound

Soundness would depend upon which link is kept fixed

Data is not sufficient to determine same

4

0° and 90°

180° and 360°

Both (A) and (B)

None of these

4

# The inversion of a mechanism is

Changing of a higher pair to a lower pair

Turning its upside down

Obtained by fixing different links in a kinematic chain

Obtained by reversing the input and output motion

4

1-3 m/s

3-15 m/s

15-30 m/s

30-50 m/s

4

No node

One node

Two nodes

Three nodes

4

ω²r. (n + 1)/n

ω²r. (n - 1)/n

ω²r. n/(n + 1)

ω²r. n/(n - 1)

4

Equal to 1

Less than 2

Equal to 2

Greater than 2

4

# The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)

(1/2). μ W (r₁ + r₂)

(2/3). μ W (r₁ + r₂)

(1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

(2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]

4

Same

Two times

Four times

None of these

4

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

Less

More

Equal

May be less or more depending on efficiency

4

# Which is the false statement about the properties of instantaneous centre?

At the instantaneous center of rotation, one rigid link rotates instantaneously relative to another for the configuration of mechanism considered

The two rigid links have no linear velocities relative to each other at the instantaneous centre

The two rigid links which have no linear velocity relative to each other at this center have the same linear velocity to the third rigid link

The double centre can be denoted either by O2 or O12, but proper selection should be made

4

# The coriolis component of acceleration exists whenever a point moves along a path that has

Linear displacement

Rotational motion

Gravitational acceleration

Tangential acceleration

4

# For the same lift and same angle of ascent, a smaller base circle will give

A small value of pressure angle

A large value of pressure angle

There is no such relation with pressure angle

Something else

4

# The train value of a gear train is

Equal to velocity ratio of a gear train

Reciprocal of velocity ratio of a gear train

Always greater than unity

Always less than unity

4

α = 45° + φ/2

α = 45° - φ/2

α = 90° + φ

α = 90° - φ

4

# Which of the following is an inversion of Single slider crank chain?

Beam engine

Rotary engine

Oldhams coupling

Elliptical trammel

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 mechanisms produces mathematically an exact straight line motion?

Grasshopper mechanism

Watt mechanism

Peaucellier's mechanism

Tchebicheff mechanism