MECHANICAL REASONING EXAM QUESTIONS

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MECHANICAL REASONING EXAM QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -42 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: A) 1/4 turn

Each time the rotating arm makes a complete revolution, it moves the slotted disc 1/4th of a turn.

Answer:

• The figure above shows a slotted disc turned by a pin on a rotating arm. One revolution of the arm

turns the disc

• 1/4 turn

• 1/2 turn

• 3/4 turn

• 1 complete turn

Question 2: C)Move downward until it reaches the floor

Newton's Law of Motion states that a body at rest will stay at rest unless acted on by an outside force. Conversely, a body in motion stays in motion unless acted on by an outside force. In this picture, both objects are at rest (equilibrium). When an outside force is added to weight 1, the equilibrium changes, moving this weight downward. Because the pulley has practically no friction, the weight strikes the floor.

Answer:

The figure above represents a pulley, with practically no friction, from which two 10pound weights are suspended as indicated. If a downward force is applied to weight 1, it is most likely that weight 1 will

• Come to rest at the present level of weight 2

• Move downward until it reaches with weight 2

• Move downward until it reaches the floor

• Pass weight 2 in its downward motion and then return to its present position

Question 3: C) 10

The sum of the moments must be zero.

Summing around the fulcrum we have:

(6ft x 5lbs) + (3ft x 10lbs) = 6ft x F

Combining terms, we get: 60(ft-lbs)=6ft x F

Dividing both sides by 6: 10lbs=F

Answer:

The force F needed to balance the lever shown above is, in pounds, most nearly

A) 7.5

B) 12.5

• 10

• 15

Question 4: A) Pulley A

The mechanical advantage is calculated by the number of strands supporting the weight. A has

• strands, B has 2, C only has 1

Answer:

Which pulley arrangement shown above requires the least force at F to lift the weight?

• A

• B

• C

• All 3 require the same force

Question 5: A)

Study the diagram and not that the follower is at its highest position between points Q and R.

Answer:

In the figure above, the follower is at its highest position between points

• Q and R

• R and S

• S and T

• T and Q

Question 6: A)A

Pulley A is the smallest gear. Therefore, it must turn faster (make more revolutions per minute).

Answer:

In this arrangement of pulleys, which pulley turns fastest?

• A

• B

• C

• D

Question 7: C)C) No. 3

Figure No. 3 has the largest surface area and thus would need the shortest sides. Area is length x width. For No. 3 area= 7ft x 4ft= 28sqft

Answer:

Shown above are the bottoms of four bins for storing materials. If the bins are all capable of holding the same amount of any particular material, then the bin whose sides have the least height is the one whose bottom is shown as

• No. 1

• No. 2

• No. 3

• No. 4

Question 8: A) Rise 1 gallon per minute

The water is filling up in the tank at a rate of 120 gallons per hour, or 2 gallons per minute (120/60=2). The tank is also emptying at a rate of 1 gallon per minute. The net flow is increasing at 1 gallon per minute, because 2gal minus 1gal= 1 gallon per minute increase.

Answer:

If water is flowing into the tank shown above at the rate of 120 gallons per hour and flowing out of the tank at a constant rate of 1 gallon per minute, the water level in the tank will

• Rise 1 gallon per minute

• Rise 2 gallons per minute

• Fall 2 gallons per minute

• Fall 1 gallon per minute

Question 9: A) Provide for changes in length of heated pipe

When steam flows through pipes, it expands. The pipes would burst if extra space were not provided for the expansion and contraction.

Answer:

The main purpose of expansion joints in steam lines is

• Provide for changes in length of heated pipe

• Allow for connection of additional radiators

• Provide locations for valves

• Reduce breakage of pipe due to minor movement of the building frame

Question 10: C) 150 pounds

The downward pull equals the 100-1b. weight being hoisted plus the 50-1b. effort required with the single movable block in the pulley, which has a mechanical advantage of

• 100 lbs. + 50 lbs. = 150 lbs.

Answer:

When the 100-pound weight is being slowly hoisted up by the pulley, as shown in the figure above, the downward pull on the ceiling to which the pulley is attached is

• 50 pounds

• 100 pounds