Ramsay Test Mechanical Reasoning 5

Question 1

In a simple series circuit, three bulbs are connected to a 12V battery. One bulb burns out (open circuit). What happens to the other two?

Accepted Answer

They all go out

Answer

In a series circuit, a break anywhere stops current flow through the entire circuit, extinguishing all bulbs.

Question 2

A rectangular beam is supported at both ends and loaded in the center. If the load is doubled, the deflection at the center:

Accepted Answer

Doubles

Answer

For a simply supported beam within the elastic range, deflection is directly proportional to load — doubling the load doubles the deflection.

Question 3

Ball bearings are used in machines primarily to:

Accepted Answer

Reduce rotational friction between moving parts

Answer

Ball bearings replace sliding friction with rolling friction, dramatically reducing energy lost between a rotating shaft and its housing.

Question 4

A cam is used in a machine to convert:

Accepted Answer

Rotary motion into controlled linear or reciprocating motion

Answer

A cam converts rotational input into a precisely shaped linear or reciprocating output motion as the follower tracks the cam profile.

Question 5

A 500 lb load is placed on a piston with a face area of 25 square inches. What is the pressure in the hydraulic system?

Accepted Answer

20 PSI

Answer

Pressure = Force / Area = 500 lb ÷ 25 sq in = 20 PSI.

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