4

# Creep in belt drive is due to

Weak material of the belt

Weak material of the pulley

Uneven extensions and contractions of the belt when it passes from tight side to slack side

Expansion of the belt

C. Uneven extensions and contractions of the belt when it passes from tight side to slack side

4

tan (α + φ)/tanα

tanα/tan (α +φ)

tan (α - φ)/tanα

tanα/tan (α - φ)

4

6 times more

6 times less

2.44 times more

2.44 times less

4

Straight line

Circle

Ellipse

Parabola

4

# The frictional torque transmitted in a flat collar bearing, considering uniform wear, 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

# In elliptical trammels

All four pairs are turning

Three pairs turning and one pair sliding

Two pairs turning and two pairs sliding

One pair turning and three pairs sliding

4

# The face of the tooth is the

Surface of the top of tooth

Surface of tooth above the pitch surface

Width of tooth below the pitch surface

Width of tooth measured along the pitch circle

4

(S₁ + S₂)/h

(S₁ - S₂)/h

(S₁ + S₂)/2h

(S₁ - S₂)/2h

4

90°

180°

360°

4

# A system of masses rotating in different parallel planes is in dynamic balance if the

Resultant force is equal to zero

Resultant couple is equal to zero

Resultant force and resultant couple are both equal to zero

Resultant force is numerically equal to the resultant couple, but neither of them need necessarily be zero

4

# Klein's construction can be used when

Crank has a uniform angular velocity

Crank has non-uniform velocity

Crank has uniform angular acceleration

Crank has uniform angular velocity and angular acceleration

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

No node

One node

Two nodes

Three nodes

4

Less

More

Same

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

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

Displacement diagram

Velocity diagram

Acceleration diagram

All of the above

4

m/(m + M)

M/(m + M)

(m + M)/m

(m + M)/M

4

# In order to balance the reciprocating masses,

Primary forces and couples must be balanced

Secondary forces and couples must be balanced

Both (A) and (B)

None of these

4

P = W tan(α - φ)

P = W tan(α + φ)

P = W tan(φ - α)

P = W cos(α + φ)

4

# Which of the following statement is wrong?

The difference between the maximum and minimum energies is called maximum fluctuation of energy

The coefficient of fluctuation of speed is the ratio of maximum fluctuation of speed to the mean speed

The variations of energy above and below the mean resisting torque line is known as fluctuation of energy

None of the above

4

# The main disadvantage of the sliding pair is that it is

Bulky

Wears rapidly

Difficult to manufacture

Both (A) and (B) above

4

# A rotor supported at A and B carries two masses as shown in the below figure. The rotor is

Dynamically balanced

Statically balanced

Statically and dynamically balanced

Not balanced

4

90°

180°

270°

4

# For two governors A and B, the lift of sleeve of governor A is more than that of governor B, for a given fractional change in speed. It indicates that

Governor A is more sensitive than governor B

Governor B is more sensitive than governor A

Both governors A and B are equally sensitive

None of the above

4

# When a body is subjected to transverse vibrations, the stress induced in a body will be

Shear stress

Bending stress

Tensile stress

Compressive stress

4

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

# Which type of gear train is used in clock mechanism to join hour hand and minute hand?

Simple gear train

Compound gear train

Reverted gear train

Epicyclic gear train

4

Fc = ar + b

Fc = ar - b

Fc = ar

Fc = a/r + b

4

10° to 20°

20° to 30°

30° to 40°

60° to 80°