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Mechanical Quiz 14 June

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Professional Development

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Mechanical Quiz 14 June
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20 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which gear type produces the quietest operation due to gradual tooth engagement?


Spur gear

Helical gear

Bevel gear

Worm gear

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Two gears of the same module are in mesh. If one gear has double the number of teeth, what happens to the speed?

Doubled

Halved

Same

Cannot determine without pressure angle

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following statements about worm gears is true?

They are used for parallel shafts

They always provide a speed increase

They allow self-locking under certain conditions

They produce less friction than spur gears

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following gear train types is best suited for achieving a large speed reduction in a compact space, and can have both input and output shafts on the same axis?


Simple gear train

Compound gear train

Reverted gear train

Epicyclic (planetary) gear train

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A spur gear pair with involute teeth is transmitting power under standard conditions. If the pressure angle ϕ is increased from 20 to 25 degree while keeping the module and number of teeth constant, which of the following is most correct regarding the implications on gear performance?

 The base circle radius increases, and the gear becomes more compact, reducing backlash.

The contact ratio decreases, resulting in increased noise and reduced smoothness.

The radial force component decreases, reducing bearing loads but increasing sliding.

The tooth becomes thinner, increasing the load-carrying capacity and durability.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In belt drives, what causes “creep”?

Uneven belt tension due to elongation

Excessive torque

Slipping between belt and pulley

Lack of lubrication

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In belt drives, which of the following would increase slip?

Increased belt tension

Using a V-belt instead of a flat belt

Decreased pulley diameter

High coefficient of friction between belt and pulley

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