4

# When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will

Oscillate with increasing time period

Oscillate with decreasing amplitude

Oscillate with constant amplitude

B. Oscillate with increasing time period

4

# In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as

Critical damping ratio

Damping factor

Logarithmic decrement

Magnification factor

4

# The example of higher pair is

Belt, rope and chain drives

Gears, cams

Ball and roller bearings

All of the above

4

tp /16

tp /4

4 tp

16 tp

4

# The ratio of maximum fluctuation of speed to the mean speed is called

Fluctuation of speed

Maximum fluctuation of speed

Coefficient of fluctuation of speed

None of these

4

Maximum

Minimum

Zero

None of these

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

# Pitch point of a cam is

A point on the pitch curve having minimum pressure angle

A point on the pitch curve having maximum pressure angle

Any point on the pitch curve

Any point on the pitch circle

4

Crank

Connecting rod

Crank pin

4

vBA × AB

vBA /AB

BA

BA /AB

4

# Angular acceleration of a link can be determined by dividing the

Centripetal component of acceleration with length of link

Tangential component of acceleration with length of link

Resultant acceleration with length of link

All of the above

4

Remains constant

Decreases

Increases

None of these

4

(1/2π). √(kG/g)

(1/2π). √(2kG/g)

2π. √(kG/g)

2π. √(2kG/g)

4

ω² × NO

ω² × CO

ω² × CN

ω² × QN

4

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

Not exist

Exist

Depend on position of crank

None of the above

4

# The direction of linear velocity of any point on a link with respect to another point on the same link is

Parallel to the link joining the points

Perpendicular to the link joining the points

At 45° to the link joining the points

None of the above

4

Four

Five

Six

Seven

4

T/3

(T.g)/3

√(T/3m)

√(3m/T)

4

# In a radial cam, the follower moves

In a direction perpendicular to the cam axis

In a direction parallel to the cam axis

In any direction irrespective of the cam axis

Along the cam axis

4

# In a steam engine, the link constitutes a

Connecting rod with big and small end brasses, caps and bolts

Crank pin, crankshaft and flywheel

All of the above

4

# When the belt is stationary, it is subjected to some tension known as initial tension. The value of this tension is equal to the

Tension in the tight side of the belt

Tension in the slack side of the belt

Sum of the tensions on the tight side and slack side of the belt

Average tension of the tight side and slack side of the belt

4

18

20

30

34

4

0.5

1

1.5

2

4

# In higher pair, the relative motion is

Purely turning

Purely sliding

Purely rotary

Combination of sliding and turning

4

# In a steam engine, one method of obtaining the earlier cut-off with a simple slide valve is by increasing the angle of advance of the eccentric while the throw of the eccentric, steam lap and exhaust lap are kept constant. This method will

Cause withdrawing or throttling of steam

Reduce length of effective stroke of piston

Reduce maximum opening of port to steam

All of these

4

Same

Different

Unpredictable

None of these

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

Base circle

Pitch circle

Prime circle

Pitch curve

4

# In gears, interference takes place when

The tip of a tooth of a mating gear digs into the portion between base and root circles

Gears do not move smoothly in the absence of lubrication

Pitch of the gears is not same

Gear teeth are undercut

4

# Which of the following is a spring controlled governor?

Hartnell governor

Hartung governor

Wilson-Hartnell governor

All of these