Bennett Mechanical Comprehension Second Edition (BMCT-II) Practice Test

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• Which statement best describes a wedge's function?
• How many simple machines are there?
• The radius of the wheel relative to the axle affects ease of spinning the axle. If the wheel's radius is greater than the axle's radius, the axle becomes ______ to spin.
• To explain centripetal motion, which direction does the centripetal force point?
• Which statement best describes the effort required on a steep incline?
• If a belt has tight-side tension 250 N and slack-side tension 200 N, what is the net driving force on the belt?
• The simple machine essentially an inclined plane wrapped around a cylinder is the?
• If the wheel radius is larger than the axle radius, the wheel and axle mechanical advantage is greater than 1.
• Which of the following is NOT one of the six simple machines?
• In circular motion with constant speed, what happens to velocity?
• As the lever moves about the fulcrum, points farther from the pivot move ________ than points closer to the pivot.
• Which force is described as directing away from the axis in circular motion?
• A hydraulic system with equal piston areas experiences a 1500 N force on one side. What is the force on the other side?
• What describes the direction of centripetal force in circular motion?
• A bolt with thread pitch 2 mm; how many turns to advance 12 mm?
• For a fixed length, increasing the number of threads results in the pitch becoming:
• _________ is the resistance of any physical object to any change in its velocity
• Which statement is true about simple machines and work?
• Friction is generally due to the _____________ of kinetic energy (motion) of two bodies to thermal energy (heat). It usually causes things to _________________
• What is the gear speed ratio between gear B and gear A?
• What are the two main functions of a pulley system?
• All wheels enclosed by the same belt revolve in the same direction.
• A simple machine that diverts the force from its blunt end to the side surface, focusing the force at the tip.
• The simple machine that is a flat inclined surface used to raise loads is the?
• The simple machine that consists of a wheel attached to an axle is the?
• On a moderately inclined plane, which of the following describes movement up and down?
• A bolt with thread pitch 1.25 mm; how many turns are needed to advance 25 mm?
• A 120 N weight rests on an inclined plane at 60 degrees. What is the component of the weight along the plane?
• Which factors can change the velocity at which an object reaches the ground?
• Which property describes the resistance of a body to changes in its velocity?
• A screw with pitch 0.5 cm is turned to raise a load by 5 cm. How many turns are required?
• The buoyant force on an object displacing 0.0005 m^3 of water is approximately how many newtons?
• Convert 120 rpm to rad/s.
• Friction typically causes moving objects to do what two things?
• As the number of rope parts supporting the load increases, the rope must be pulled farther to lift the weight.
• A belt drive has driving pulley diameter 50 mm and driven pulley diameter 150 mm. If driving pulley rotates at 1200 rpm, what is driven speed?
• A wheel has radius 0.1 meters. What is its circumference?
• Which statement best describes a first class lever?
• In a First Class Lever, the fulcrum is located between which two parts?
• Two gears with 24 and 60 teeth mesh. If 24T drives 60T, which statement correctly describes the speeds and torques relative to each other?
• In a hydraulic system, a piston with area 2 cm^2 experiences 20 N of force. What pressure is transmitted?
• A hollow cylinder with radius 0.1 m and height 0.5 m has what volume in liters?
• If a resistor has a resistance of 8 Ω and is connected to a 24 V source, what is the current?
• If the output work is 60 J and the input work is 80 J, what is the efficiency?
• What simple machine consists of two discs rotating about the same axis?
• Which statement best describes inertia's role in circular motion?
• A rod of length 1.5 m expands by ΔL = α L ΔT with α = 12×10^-6 /°C and ΔT = 80°C. What is ΔL?
• The fixed point on which a lever rotates is called the?
• A block on an inclined plane with μ = 0.2 and angle 30°. What is the additional push required to begin motion if weight is 100 N?
• If a pipe has diameter halved and flow rate remains constant, by what factor does velocity change?
• In the mechanical advantage formula MA = L / W for a wedge, what do L and W represent?
• Which lever class typically yields a mechanical advantage less than 1?
• When you push forward, the inclined planes of the wedge ____ .
• If the length of an inclined plane increases while its height remains fixed, the mechanical advantage:
• The distance between two consecutive threads on a screw is called the:
• Which factors can change the observed direction of rotation in a belt drive?
• The simple machine that changes the direction of the applied force is the?
• A screw thread advances 1.75 mm per revolution; how many revolutions to move 8.75 mm?
• An inclined plane measures 3 m long and rises 0.75 m. What is the ideal mechanical advantage?
• If piston A has area 2 cm^2 and force 50 N, connected to piston B with area 8 cm^2, what is the force on piston B?
• Which arrangement defines a Third Class Lever?
• Balance rule expression for lever: F1*D1 = F2*D2
• If gear B has twice as many teeth as gear A, the gear ratio is 2.
• If the centripetal force were removed, what would happen to the body in circular motion?
• A block on a horizontal surface experiences a normal force of 50 N and a coefficient of kinetic friction μk = 0.25. What is the kinetic friction force?
• Which term describes the constant value that determines the rate at which objects accelerate toward Earth due to gravity (ignoring air resistance)?
• With V = 12 V and I = 2 A, what is the electrical power P?
• A rough inclined plane compared with a smooth one will generally be which?
• A lever with effort arm 0.4 m and load arm 0.2 m. What is the velocity ratio?
• In a compound gear train, stage 1 ratio is 4:1 and stage 2 ratio is 3:1. If input speed is 1800 rpm, what is stage 2 output rpm?
• Which option describes centrifugal force?
• If the fulcrum is in the middle, with the effort on one side and the load on the other, what class lever is this?
• In a gear train with multiple gears, what is the rotational relationship between odd and even gears?
• A screw has pitch 2 mm and a mean turning radius 15 mm. What is the ideal mechanical advantage?
• Tight-side tension is 300 N and slack-side tension is 230 N. What is the net driving force on the belt?
• If two gears are mounted on the same shaft, what is true about their rotation direction?
• If the mechanical advantage is greater, the work becomes?
• In a pulley problem, the rope length s equals p times h, i.e., s = p × h.
• Gravity on an incline pulls objects downward. Which statement is correct about movement up versus down?
• A pneumatic cylinder is supplied with 100 psi. If the piston area is 0.5 in^2, what force is produced?
• In a lever, the side where the input force is applied is called the?
• Compared with lifting straight up, moving along an inclined plane typically involves which of the following?
• A force of 6 N is applied at the end of a 0.75 m lever. What is the torque?
• Mechanical Advantage of a lever equals
• ___________ is the force resisting the relative motion of objects that touch other solids or move through fluids (liquids and gas).
• Springs with small diameters will overextend before springs with longer diameters.
• Two gears mesh together. What is always true about their rotation directions?
• If the output work is 90 J and the machine efficiency is 75%, what input work is required?
• A simple machine with a theoretical MA of 4; if you apply 25 N input force, what is the output force ignoring friction?
• A wedge is made up of two inclined planes joined together, forming a V-shaped object. What does the wedge primarily do to the direction of the applied force?
• Which force is directed toward the center to maintain circular motion?
• In a belt drive, the driving pulley has a diameter of 40 mm and the driven pulley has a diameter of 80 mm. If the driving pulley rotates at 1500 rpm, what is the driven speed?
• The part of a screw that behaves like an inclined plane wrapped around the shaft is the:
• The vertical component of a 40 N force applied at 60° to the horizontal is what?
• Therefore, any two objects falling from the same height will reach the ground at the same time.
• What is the point around which the resultant torque due to gravity forces vanishes?
• A driven pulley has diameter 50 mm and driver 25 mm. If driver rotates at 600 rpm, what is driven rpm?
• Which type of lever converts a large effort applied near the fulcrum into moving a small load through a greater distance; examples include a shovel, a baseball bat, and a fishing rod?
• Turning directions have opposite effects on a screw: one direction tightens and the other loosens. Which pairing is correct?
• The kinetic friction force on a weight of 50 N with μk = 0.3 is what value?
• What is the circumference of a wheel with a radius of 0.25 meters?
• A ______________ wedge will require more force because it has a wider angle at the tip; thinner wedges better for cutting.
• If piston A has an area of 4 cm^2 and force 20 N, connected to piston B with area 16 cm^2, what is the force on piston B?
• A crate is pushed 8 m with a constant force of 60 N ignoring friction. What is the work done?
• If pitch increases while the circumference stays the same, the mechanical advantage:
• If an object is not balanced on its center of gravity, it will be ______.
• A buoyant force on an object submerged in water is equal to the weight of displaced water. If 0.001 m^3 of water is displaced, what is the buoyant force?
• Inertia includes changes to the object's ____________
• If the input work is 120 J and the machine efficiency is 75%, what is the output work?
• In a third-class lever, the main effect is to increase the distance the load travels.
• In a wheel and axle, rotating the wheel is easier when the effort is applied at the greater radius.
• In the screw mechanical advantage formula, which term is in the numerator?
• Which arrangement is connected side by side and increases stiffness due to force sharing?
• A screw has lead 3 mm and mean turning radius 12 mm. What is the ideal mechanical advantage?
• If the cross-sectional area is halved while the flow rate Q remains constant, by what factor does velocity change?
• What is the formula for the mechanical advantage of a wheel and axle?
• In a gear train, gear C has fewer teeth than gear A; gear C will rotate faster than gear A.
• What common phrase hints at standard screw threading?
• What is calculated as the ratio of the length of an inclined plane to its height?
• In parallel spring arrangement, how does total stiffness change and how is the force distributed?
• Power from torque and angular velocity: If τ = 10 N·m and ω = 50 rad/s, what is P?
• Creating a bend in the belt drive can make pulleys appear to rotate in opposite directions even when they actually rotate the same way.
• Which of the following is an example of a lever?
• A bolt with thread pitch 2 mm; how many revolutions to advance 12 mm?
• The velocity ratio of a lever is 3. If the output displacement is 0.1 m, what is the input displacement?
• A screw with pitch 2 mm; how many revolutions are needed to advance 24 mm?
• Which condition leads to greater gravitational attraction between two bodies?
• Weight is the force due to gravity acting on a mass.
• Mechanical Advantage of a screw is equal to the circumference divided by the:
• Gravity is described as a relatively weak force.
• What is the term for the force that resists relative motion between two contacting solids or through a fluid?
• Which statement is true about centrifugal force?
• In a hydraulic scenario, a piston with area 3 cm^2 experiences 30 N of force; what is the transmitted pressure in kPa?
• Which law describes that an object at rest stays at rest and an object in motion stays in motion unless acted upon by an outside force?
• In the compressed or extended position, springs store energy, which is usually converted to kinetic energy.
• What does the numerator in the mechanical advantage formula represent?
• On a 100 N weight on a 30° incline with μ = 0.2, what is the maximum static friction force?
• Using the capstan equation T1/T2 = e^(μ θ) with μ = 0.4 and θ = π, what is the tension ratio T1/T2?
• In a two-stage gear train, stage 1 has 12 teeth driving 36 teeth, and stage 2 has 36 teeth driving 60 teeth. If stage 1 input is 1200 rpm, what is stage 2 output rpm?
• In a Third Class Lever, which arrangement is typical?
• Which rotation tightens standard right-handed threads?
• Wheel and axle system with wheel radius 0.3 m and axle radius 0.05 m. If a 120 N force is applied at the wheel, what load is lifted at the axle?
• In a lever, the arm that moves the load on the opposite side of the fulcrum is called the
• Left-hand screws have a reverse-thread arrangement and require counterclockwise rotations to tighten.
• A machine operates at 75% efficiency. If the output work is 60 J, what is the input work?
• If an object is balanced at its center of gravity, it should not lean.
• When a body is not balanced on its center of gravity, it tends to become less stable.
• Which statement correctly describes springs connected in series?
• Which term describes how much a machine makes an action easier?
• What effect does a pulley primarily have on the direction of the applied force?
• A material expands 0.3% when heated. If the original length is 2.0 m, what is the new length?
• Springs with thick coils will overextend before springs with thin coils.
• In which lever arrangement is the fulcrum on one side, the load on the other side, and the effort in the middle?
• Which simple machine is a wheel on an axle designed to support the movement of a cable or belt along its circumference?
• The longer and sharper (thinner) a wedge is, the less effort it will take for the work to get done.
• A simple machine has a theoretical mechanical advantage of 3. If you apply 30 N input force, ignoring friction, what is the output force?
• A piston with area 5 cm^2 is subjected to a pressure of 200 kPa. What is the resulting force on the piston?
• A shaft operates at τ = 25 N·m and ω = 16 rad/s. What is the power P?
• Arrangements of several springs are either in ________________ .
• The greater the mass and the smaller the radius, the ________ is the gravity.
• In a Second Class Lever, the load is located between which parts?
• What is the direction of the centrifugal force relative to the axis when a body moves in a circle?
• Moment forces are created, which may lead to the tilt or collapsing of the object. These moments must be ______ by structures that restrict movement or provide counter-moments.
• The person requires less effort than direct lifting, as long as which arm is greater than which?
• If T2 equals 2.0 N and the capstan ratio T1/T2 ≈ 3.51, what is T1?
• A simple machine with mechanical advantage of 5; if you apply 20 N input force, what is the output force?
• Due to inertia, an object moving on a circular path tends to move in which direction?
• The gear ratio between gear B and gear A is defined as what expression?
• In a fully meshed gear train, the gear ratio is the inverse of the speed ratio.
• A hydraulic system with equal piston areas and applying 1000 N on one side; what is the force on the other side?
• To lift a heavy load with little effort, using a long effort arm, which description is correct?
• A lever has a fulcrum with effort arm 40 cm and load arm 10 cm. If the load weighs 200 N, what effort is needed to balance?
• If the wheel radius equals the axle radius, the mechanical advantage equals 1.
• As a rule of thumb, unless a force is acting on an object, it will maintain its movement in a ____________ at a constant speed.
• If a load W is supported by p parts of the rope, the input rope force must be equal to what?
• What is the circumference of a wheel with radius 0.75 meters?
• In a pipe, if the flow rate Q is constant and the cross-sectional area doubles, by what factor does velocity change?
• Which lever class is typically used to maximize speed and distance rather than force?
• A rod of length 3.0 m expands by 0.3%. What is the new length?
• What is the volume, in cubic meters, of a hollow cylinder with radius 0.1 m and height 0.5 m?
• An inclined plane is 6 m long and rises 1.5 m. What is the ideal mechanical advantage?
• What is the circumference of a wheel with radius 0.4 meters?
• What is mechanical advantage?
• The power transmitted by a rotating shaft is P = τ ω. If τ = 15 N·m and ω = 188.5 rad/s, what is P?
• To tighten bolts and nuts, they turn in opposite directions.
• Shorter springs will __ before long ones.
• If T1 = 7 N and T1/T2 ≈ 3.51, what is T2 approximately?
• In rotating reference frames, which description of centrifugal force is accurate?
• A rotating disk with radius 0.2 m has a tangential force of 25 N. What is the torque about the center?
• In the wedge mechanical advantage formula MA = L / W, what does W denote?
• A hydraulic jack has F1 = 200 N on A1 = 1 cm^2 and A2 = 4 cm^2. What is F2?
• If the wheel radius is much larger than the axle radius (R >> r), the mechanical advantage is ...
• In a connected gear train, a gear with fewer teeth will typically rotate faster than a gear with more teeth.
• In a circuit with V = 12 V and R = 6 Ω, what is the current I?
• Pitch is defined as the distance between two consecutive threads. For a fixed length, more threads cause the pitch to become:
• A single movable pulley provides a mechanical advantage of 2. If a 150 N load is lifted, what effort is needed?
• A force of 40 N is applied at 60° to the horizontal. What is the horizontal component of the force?
• Placing a gear on the external part of the belt causes the larger wheel to spin in the opposite direction to the smaller wheel.
• What is a key characteristic of how a wedge concentrates force?
• In circular motion around an axis, in which direction is the centripetal force directed?
• Which configuration provides greater extension flexibility under the same load?
• The simple machine formed by two inclined planes back to back is the?
• A wheel of radius 0.5 m has a force of 100 N applied tangentially. What torque is produced?
• What is the formula for mechanical advantage?
• Which force is directed toward the center to maintain circular motion?
• gravity is mainly the gravitational force of the Earth, which gives weight to all the objects and generally ______________ towards the core of Earth
• A bolt thread pitch is 1.75 mm; how many turns are required to advance 8.75 mm?
• ___________ is a natural phenomenon in which any two objects with mass or energy attract one another.
• Which force is required to keep an object moving in a circle?
• Two gears on the same shaft rotate in the same direction and are not counted as part of the same gear train.