Mixed Deck — All Bennett Mechanical Test Topics Flashcards
100 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 20 Mixed Deck — All Bennett Mechanical Test Topics flashcards as text
The change in pitch as a moving siren passes you is called the:
Answer: Doppler effect
The Doppler effect changes perceived frequency as a sound source moves toward or away.
A standard bolt with a right-hand thread is being held stationary. To move a nut further *onto* the bolt (away from the head), in which direction must the nut be turned from the perspective of someone looking at the head of the bolt?
Answer: Clockwise
This follows the "right-hand rule" for standard threads, often remembered by the mnemonic "righty-tighty, lefty-loosey". To tighten a nut or screw (moving it down the shaft), you turn it clockwise.
A tall, rectangular box is placed on a flat plank. The plank is then slowly tilted. At which point will the box begin to tip over?
Answer: When a vertical line drawn downward from the box's center of gravity falls outside its base of support.
An object on an incline is stable as long as the vertical line extending from its center of gravity passes through its base of support. [2, 20] The moment the line falls outside the base, a tipping torque is created by gravity, and the object will overturn. [20, 28] Sliding occurs if the force of friction is overcome first, but the question asks about the condition for tipping. [27]
A flatbed truck carries cargo. For best stability while turning, cargo should be loaded?
Answer: Low and centered
Loading low and centered keeps the center of gravity low and balanced, improving stability in turns.
Why does warm air rise above a heater?
Answer: Warm air is less dense than cool air
Heated air expands, becomes less dense, and is pushed up by surrounding cooler air.
When you rub your hands together quickly, they get warm because:
Answer: Friction converts mechanical energy into heat
Friction between surfaces transforms motion into thermal energy.
Which surface produces the most friction when an object slides across it?
Answer: Rough concrete
Rougher surfaces create more friction than smooth or lubricated ones.
When two springs of equal strength are connected end to end and stretched, compared to one spring they:
Answer: Stretch more for the same pull
Springs in series stretch more because each one extends.
When ice melts in a warm drink, the drink gets colder because the ice:
Answer: Absorbs heat from the drink to melt
Melting ice draws latent heat from the surrounding liquid, cooling it.
A stiffer spring has a _____ spring constant.
Answer: Higher
A higher spring constant means more force is required per unit of displacement, which is the definition of a stiffer spring.
Horsepower (hp) is a unit used to measure which physical quantity?
Answer: Power
Horsepower is a unit of power, where 1 hp equals approximately 746 watts.
A nut needs 24 N·m of torque to turn. Using a 0.3 m wrench, what minimum force is needed?
Answer: 80 N
Force equals torque divided by length, so 24 ÷ 0.3 = 80 N.
A balanced see-saw has a 40 lb child 4 ft from the pivot. Where must a 20 lb child sit to balance?
Answer: 8 ft from the pivot
Balance needs equal moments: 40x4 = 20x8, so the lighter child sits 8 ft out.
Which scenario describes heat transfer by conduction?
Answer: A metal rod's far end warming when one end is in flame
Heat moving along the solid metal rod by direct particle contact is conduction.
A projectile launched horizontally and a ball dropped at the same instant will land when?
Answer: They land at the same time
Horizontal motion does not affect vertical fall, so both hit the ground simultaneously.
Compared to sliding (kinetic) friction, rolling friction between the same surfaces is generally:
Answer: Less
Rolling friction is significantly less than sliding friction because contact area and deformation are reduced.
Two connected pistons must conserve volume of fluid. If the small piston moves 10 inches and has area 2 in², how far does a 10 in² piston move?
Answer: 2 inches
Volume is equal: 2 × 10 = 10 × d, so d = 2 inches.
Which material would make the best insulator to keep a house warm?
Answer: Fiberglass batting
Fiberglass traps air pockets that slow heat transfer, making it a good insulator.
A triangular shelf bracket transfers a load to the wall. Which member is typically in compression?
Answer: The diagonal brace
The diagonal brace pushes against the wall and is loaded in compression.
A spring has a spring constant of 50 N/m. How much force is needed to stretch it 0.2 meters?
Answer: 10 N
Using F = kx: F = 50 N/m × 0.2 m = 10 N.