Online Quiz Theory of Machine.

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All Questions are compulsory
Each questions carry 1 mark

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Institute Name *

Torsional pendulum is used to determine mass moment of inertia of *

flywheel

rigid bar

both a. and b.

none of the above

Scotch yoke mechanism is the inversion of *

Single slider kinematic chain

Double slider kinematic chain

Four bar chain

None of the above

Watt's mechanism is based on *

inversions of single slider chain mechanism

inversions of double slider chain mechanism

inversions of four bar chain mechanism

inversions of five bar chain mechanism

Which type of mechanism is shown below? *

constrained

unconstrained

locked

.none of the above

One Quaternary joint is equal to how many binary joints? *

none of the above

Maximum efficiency of spiral gears is given as *

[cos ( θ + Φ) + 1] / [ cos ( θ – Φ) + 1]

[cos ( θ + Φ) – 1] / [ cos ( θ – Φ) – 1]

[sin ( θ + Φ) – 1] / [ cos ( θ – Φ) – 1]

[sin ( θ + Φ) – 1] / [ sin ( θ – Φ) – 1]

Which type of gears have point contact between two mating gears? *

Helical gears

Spiral Gear

Both a & b

None of the above

In centrifugal clutches, when is the contact between shoe friction lining and surface of drum observed? *

When centrifugal force is less than spring force

When centrifugal force is equal to spring force

When centrifugal force is greater than spring force

None of the above

Which of the following conditions can be used to minimize undercutting in cam and follower mechanism? *

By using larger roller diameter

By using internal cams

By decreasing the size of the cam

All of the above

The chain used in positively infinitely variable drive provides *

friction type drive

positive drive

Both a. and b.

None of the above

For a simple gear train, velocity ratio is the ratio of *

Speed of driving shaft and speed of driven shaft

Speed of driven shaft and speed of driving shaft

Speed of driven shaft and (speed of driving shaft + speed of idler gears)

Speed of driving shaft and (speed of driven shaft + speed of idler gears)

What is meant by contact ratio in gears? *

Ratio of length of arc of approach and circular pitch

Ratio of circular pitch and length of arc of contact

Ratio of length of arc of recess and circular pitch

Ratio of length of arc of contact and circular pitch

Interference in gear tooth profiles can be avoided by *

modifying tooth profile

modifying center distance between pinion and wheel

both a. and b.

none of the above

In simple gear trains, velocity ratio is independent of idle gears *

True

False

Choose the correct pair *

. 1 – A, 2 – C, 3 – D, 4 – B

1 – D, 2 – A, 3 – C, 4 – B

1 – B, 2 – D, 3 – C, 4 – A

1 – C, 2 – A, 3 – B, 4 – D

Effort of a governor is the *

Work-done at the sleeve for maximum equilibrium speed

Mean force exerted at the sleeve for a given percentage change of speed

Mean force exerted at the sleeve for maximum equilibrium speed

None of the above

Which of the following statements is true for gear drive? *

Gear drives can transmit very large power

Gear drives have low transmission efficiency

Gear drives require more space

All of the above

In spiral gears if normal circular pitch is 13 mm. What is the normal module? *

40.84 mm

2.06 mm

4.13 mm

None of the above

Back cone angle is observed in which type of gears? *

Spur gears

Helical gears

Bevel gears

None of the above

Which of the following factors are not responsible for unbalancing in rotating systems? *

Errors

Tolerances

Shape of the rotor

None of the above

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