TalentLens - TalentLens Mechanical Comprehension Principles Questions and Answers

Question 1

In the gear system shown, Gear X has 10 teeth and rotates clockwise. Gear Y has 20 teeth, and Gear Z has 10 teeth. Which of the following statements is true?

Accepted Answer

Gear Z rotates clockwise at the same speed as Gear X.

Answer

Gear Z rotates counter-clockwise at the same speed as Gear X.

Answer

Gear Z rotates clockwise and slower than Gear X.

Answer

Gear Z rotates counter-clockwise and faster than Gear X.

Question 2

A bimetallic strip is made of copper and steel bonded together. The coefficient of thermal expansion for copper is higher than that of steel. If the strip is heated, what will happen?

Accepted Answer

The strip will bend with the copper on the outside of the curve.

Answer

The strip will expand in length but remain straight.

Answer

The strip will bend with the steel on the outside of the curve.

Answer

The strip will not bend, but it will become thicker.

Question 3

In the pulley system shown, a person is lifting a 100 kg weight. Ignoring the weight of the rope and pulleys and any friction, what is the minimum force required to lift the weight?

Accepted Answer

25 kg

Answer

100 kg

Answer

50 kg

Answer

33.3 kg

Question 4

Which of the following designs for a cargo truck is the most stable and least likely to tip over on a sharp turn?

Accepted Answer

A truck with a low center of gravity and a wide wheelbase.

Answer

A truck with a high center of gravity and a narrow wheelbase.

Answer

A truck with a low center of gravity and a narrow wheelbase.

Answer

A truck with a high center of gravity and a wide wheelbase.

Question 5

A hydraulic lift is used to raise a car. A force of 100 N is applied to a small piston with an area of 5 cm². If the large piston has an area of 500 cm², what is the maximum lifting force that can be generated?

Accepted Answer

10,000 N

Answer

1,000 N

Answer

5,000 N

Answer

50,000 N

Question 6

If a person uses a 2-meter long crowbar as a first-class lever to lift a heavy rock, where should the fulcrum be placed to require the least amount of effort from the person?

Accepted Answer

As close to the rock as possible.

Answer

Exactly in the middle of the crowbar (1 meter from the rock).

Answer

As close to the person's hands as possible.

Answer

The fulcrum position does not affect the effort required.

In the gear system shown, Gear X has 10 teeth and rotates clockwise.Gear Y has 20 teeth, and Gear Z has 10 teeth.Which of the following statements is true?

In the gear system shown, Gear X has 10 teeth and rotates clockwise.
Gear Y has 20 teeth, and Gear Z has 10 teeth.
Which of the following statements is true?