What is the correct answer?

4

# The contact ratio for gears is

Zero

Less than one

Greater than one

Infinity

### Correct Answer :

C. Greater than one

### Related Questions

What is the correct answer?

4

# The transmissibility, for all values of damping factor, will be less than unity, if ω/ωn is

Equal to 1

Less than 2

Equal to 2

Greater than 2

What is the correct answer?

4

# When the particles of a body moves perpendicular to its axis, then the body is said to have

Longitudinal vibration

Transverse vibration

Torsional vibration

None of these

What is the correct answer?

4

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

Whitworth quick return mechanism

Elliptical trammels

Rotary engine

Universal joint

What is the correct answer?

4

# One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by (where δ = Deflection of the spring)

2π. √(g/δ)

1/2π. √(g/δ)

2π. √(δ/g)

1/2π. √(δ/g)

What is the correct answer?

4

# The tractive force is maximum or minimum when the angle of inclination of crank with the line of stroke (θ) is equal to

0° and 90°

90° and 180°

135° and 315°

270° and 360°

What is the correct answer?

4

# If D₁ and D₂ be the diameters of driver and driven pulleys, then belt speed is proportional to

D₁/D₂

D₂/D₁

D₁.D₂

D₁

What is the correct answer?

4

# In a steam engine, the distance by which the outer edge of the Dslide valve overlaps the steam port is called

Lead

Steam lap

Exhaust lap

None of these

What is the correct answer?

4

# The two parallel and coplanar shafts are connected by gears having teeth parallel to the axis of the shaft. This arrangement is known as

Spur gearing

Helical gearing

Bevel gearing

Spiral gearing

What is the correct answer?

4

# The ratio of the maximum displacement of the forced vibration to the deflection due to the static force, is known as

Damping factor

Damping coefficient

Logarithmic decrement

Magnification factor

What is the correct answer?

4

# In a shaper mechanism, the Coriolis component of acceleration will

Not exist

Exist

Depend on position of crank

None of the above

What is the correct answer?

4

# The sense of coriolis component 2 ωv is same as that of the relative velocity vector v rotated at

45° in the direction of rotation of the link containing the path

45° in the direction opposite to the rotation of the link containing the path

90° in the direction of rotation of the link containing the path

180° in the direction opposite to the rotation of the link containing the path

What is the correct answer?

4

# Which of the following is a turning pair?

Piston and cylinder of a reciprocating steam engine

Shaft with collars at both ends fitted into a circular hole

Lead screw of a lathe with nut

Ball and a socket joint

What is the correct answer?

4

# When the sleeve of a Porter governor moves downwards, the governor speed

Increases

Decreases

Remain unaffected

First increases and then decreases

What is the correct answer?

4

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

Oldham's coupling

Elliptical trammel

Scotch yoke mechanism

All of these

What is the correct answer?

4

# The maximum fluctuation of energy is the

Difference between the maximum and minimum energies

Sum of the maximum and minimum energies

Variations of energy above and below the mean resisting torque line

Ratio of the mean resisting torque to the workdone per cycle

What is the correct answer?

4

# In higher pair, the relative motion is

Purely turning

Purely sliding

Purely rotary

Combination of sliding and turning

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

# Whitworth quick return mechanism is obtained by inversion of

Slider crank mechanism

Kinematic chain

Five link mechanism

Roller cam mechanism

What is the correct answer?

4

# The Coriolis component of acceleration acts

Along the sliding surface

Perpendicular to the sliding surface

At 45° to the sliding surface

Parallel to the sliding surface

What is the correct answer?

4

# For the brake to be self locking, the force P at C shown in the below figure, should

Be zero

Act in upward direction

Act in downward direction

None of these

What is the correct answer?

4

# The relation between number of links (l) and number of joints (j) in a kinematic chain is

l = (1/2).(j + 2)

l = (2/3).(j + 2)

l = (3/4).(j + 3)

l = j + 4

What is the correct answer?

4

# In full depth involute system, the smallest number of teeth in a pinion which meshes with rack without interference is

12

16

25

32

What is the correct answer?

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

What is the correct answer?

4

# A flywheel is fitted to the crankshaft of an engine having W as the amount of indicated work per revolution and permissible limits of coefficient of fluctuation of energy and speed as CE and CS respectively. The kinetic energy of the flywheel is given by

2 W CE / CS

W CE / 2CS

W CE / CS

W CS / 2CE

What is the correct answer?

4

# In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

Because of difficulty in manufacturing cam profile

Because of loose contact of follower with cam surface

In order to have acceleration in beginning and retardation at the end of stroke within the finite limits

Because the uniform velocity motion is a partial parabolic motion

What is the correct answer?

4

# A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Magnitude of the forces on journal

Angular velocity of journal

Clearance between journal and bearing

Radius of journal

What is the correct answer?

4

# Tangential acceleration direction is

Along the angular velocity

Opposite to angular velocity

May be any one of these

Perpendicular to angular velocity

What is the correct answer?

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

What is the correct answer?

4

Zero

Minimum

Maximum

None of these