The mechanical advantage of the block and tackle (complex combination of fixed and moveable pulleys) pictured here is ...
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Correct Answer:
4
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A bicycle an example of gears that don’t have to be touching one another to work together. This is possible because of a chain that connects the gears. This chain has links in it that fit into the teeth of the gears. A gear that has teeth that fit into the links of a chain is called a ...
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Correct Answer:
Sprocket
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When gears are used in a gear train, the resulting effect is that each gear travels ...
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Correct Answer:
In an opposite direction than the one it is nearest to
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Gears are used in combination, with the teeth of the gears interlocking, so when one moves the other moves as well. Effort can be applied to the first gear (24 teeth), with the resulting effect on the second gear (12 teeth) being a ...
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Correct Answer:
Speed advantage of 2
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A device that consists of a small cylinder, with a handle or a crank, is called a ...
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Correct Answer:
Winch
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The science of designing machines to suit people is called ergonomics. The primary criteria used in designing a machine ergonomically is...
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Correct Answer:
Comfort
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Hockey players realize that the advantage of using a hockey stick, as a 3rd Class lever, is that the force they apply to the puck will move it ...
Answer
Correct Answer:
Faster
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It takes 120N of force to raise the flag up the flagpole. The load is 120N. What is the mechanical advantage? ...
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Correct Answer:
1
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Calculate the mechanical advantage, when 736 N of force is used on a bicycle pedal, causing 81 N of force to move the bicycle forward.
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Correct Answer:
0.11
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Work is energy in action. It is measured in ...
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Correct Answer:
J (Joules)
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In the lever above, the Effort Force is applied at E. This makes it a …
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Correct Answer:
3rd Class lever
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The Canadarm is an example of what simple machine?
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Correct Answer:
Class 3 lever
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A diving board is an example of what simple machine?
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Correct Answer:
Class 1 lever
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A simple machine that converts rotational motion to linear motion is called …
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Correct Answer:
Screw
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A teeter-totter an example of what simple machine?
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Correct Answer:
Class 1 lever
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Scissors are an example of what simple machine?
Answer
Correct Answer:
Class 1 lever
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A hockey stick is an example of what simple machine?
Answer
Correct Answer:
Class 3 lever
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A wheelbarrow is an example of what simple machine?
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Correct Answer:
Class 2 lever
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A unit of work in the SI system of measure.
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Correct Answer:
Newton-Meter
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The product of the force applies to an object along its direction of motion and the distance the object moves while the force is applied.
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Correct Answer:
Mechanical Work
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Define Joule
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Correct Answer:
A unit of work measurement in the SI system of units.
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An arrangement of pulleys without gears with lines connected in such a way to make the movement of heavy objects easier we used in a lab.
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Correct Answer:
Block and Tackle
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Pi is correctly defined as
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Correct Answer:
It is equal to the ratio of the circumference of any circle and its diameter.
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Define Foot-Pound
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Correct Answer:
The unit of work in the English system of measure.
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A ratio of the output work delivered by a machine to the input work done on the machine to operate it.
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Correct Answer:
Efficiency
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Which of the following correctly defines "Unifying Concept".
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Correct Answer:
A concept that has common application in several energy systems.
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Define Radian
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Correct Answer:
The unit angle of measure equal to 57.3 degrees.
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A force that opposes the movement of one solid in contact with another solid.
Answer
Correct Answer:
Friction
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A wrench with an 18 inch handle turns through an angle of 2.3 radians while a force of 50 lbs. is applied to the end of the handle. How much work is done?
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Correct Answer:
2070 in.lb
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A loaded cart is pulled a distance of 100 meters by an electric truck that exerts 900 newtons of force to pull the cart at a constant speed. if the 100 meters is covered in 12 seconds, how much work is done?
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Correct Answer:
9.0 x 104Nxm
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A vertical force raises a 150 lb. box 6 ft. The amount of work done is:
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Correct Answer:
900 ft x lbs.
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The length of the radius of a circle measured on the circumference is one:
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Correct Answer:
Radian.
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Work done by a torque is equal to the torque applied times the:
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Correct Answer:
Angle moved through.
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How much work is done while an electric motor drives a pump through 40 revolutions, given the motor delivers 150 Vxm of torque?
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Correct Answer:
37680 joules
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520 Nxm of work is done when a 50 newton force is moved a distance. How far is the load moved?
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Correct Answer:
10.4 meters
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Two hundred newtons of force are required to lift a mass 1.2 meters above the floor. How many newton.meters of work is done?
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Correct Answer:
240
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A vertical force raises a 200 lb. barbell 5ft. the amount of work done is:
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Correct Answer:
1000 ft.xlbs.
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How much work is being done by a person holding a 60 pound suitcase 18 inches above the floor?
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Correct Answer:
None
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The prime mover in an angular mechanical system is called torque which is determined by multiplying the force applied, by the lever arm. The lever arm is equal to the:
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Correct Answer:
Radius of the circle in which the force is applied.
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Which of the following is NOT an effect of mechanical work on an object?
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Correct Answer:
The object remains in place.
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Newtons of force are required to lift a mass 3.5 meters above the floor. How many newton.meters of work is done?
Answer
Correct Answer:
129.5
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Which of the following material has the carbon varying from 4.3 to 6.67%?
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Correct Answer:
Pig Iron
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Which of the following material has the carbon varying from 2.1 to 4.3%?
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Correct Answer:
Cast iron
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Which of the following reaction does not exhibit a mushy zone in the Fe-C phase diagram?
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Correct Answer:
Eutectic reaction
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What is the Iron-Carbon phase diagram?
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Correct Answer:
Binary phase diagram
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What is the melting point of iron (in ℃)?
Answer
Correct Answer:
1535
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Which of the following non-destructive testing is used to detect the change in the composition of any material?
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Correct Answer:
Radiography
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Which penetrating liquid is used for the liquid penetration test?
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Correct Answer:
Petroleum-based carrier fluid
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Which of the following property is the fine-grained structure?
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Correct Answer:
Ductility
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Which equipment can be used for the inspection of the inside portion of the hollow chamber or narrow tube?
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Correct Answer:
Borescope
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Etching of specimen is done to achieve _______
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Correct Answer:
Visible grain boundary
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What is the first step involved in the process of preparing test samples for microstructural examination?
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Correct Answer:
Fine grinding
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What is the scale range of the Mohs hardness test?
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Correct Answer:
1 - 10
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ASTM stands for?
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Correct Answer:
American Society for Testing and Materials
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Which one of the following is least symmetrical?
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Correct Answer:
Monoclinic
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Which of the following axis system is being satisfied by tetragonal crystal system?
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Correct Answer:
A = b ≠ c, α = β = ϒ = 90°
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Which of the following has less crystallinity?
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Correct Answer:
Low-density polythene
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Which metal from the following has the non-crystalline structure?
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Correct Answer:
Silica Glass
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In which test, the specimen will be used in the form of the supported beam?
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Correct Answer:
Izod test
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Which hardness test uses the steel ball as indenter?
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Correct Answer:
Brinell Hardness test
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What we call the resistance of a material against any external force.
Answer
Correct Answer:
Strength
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What is the relation between eddy current damping coefficient and resistance in PMMC device?
Answer
Correct Answer:
Inverse proportionality
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Which of the following represents for torque speed characteristic for dc motor?
Answer
Correct Answer:
Negative slope
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For a constant field dc motor, what is the relation between the mechanical time constant and armature resistance?
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Correct Answer:
Direct proportionality
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Which of the following is the correct conversion in an electro mechanical system?
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Correct Answer:
Both electrical to mechanical and mechanical to electrical
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Torque developed by a DC motor will be proportional to armature current.
Answer
Correct Answer:
True
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Most electrical indicating instruments are electromechanical systems since ________________
Answer
Correct Answer:
They convert electrical quantity to mechanical quantity
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Transfer function of force motor is _____________
Answer
Correct Answer:
Kf
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Which of the following represents transfer function of tacho-generators?
Answer
Correct Answer:
Kg
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Current to force and current to torque conversion is possible only for a constant current source.
Answer
Correct Answer:
True
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Tacho generators are ______________
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Correct Answer:
Zero-order system
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20N force is acting on a 5Kg body. What will be its rate of change of velocity?
Answer
Correct Answer:
4m/s2
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Transfer function of force acting on a body is given as 1/(s2 M). What will be the transfer function of a rotating body?
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Correct Answer:
1/(s2 j)
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What is the equivalent quantity of capacitance in the transfer function of the viscous force?
Answer
Correct Answer:
Damping coefficient
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What will you call the friction between a relative motion of two bodies?
Answer
Correct Answer:
Viscous friction
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Name the Friction which acts till the body starts moving?
Answer
Correct Answer:
Static friction
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Spring is a ___________ order system.
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Correct Answer:
Zero
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Restoring force of a spring under stress is F(s) = ____________
Answer
Correct Answer:
KX(s)
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Linear and torsional springs are used to provide ________________ and __________________
Answer
Correct Answer:
Restoring force and torque respectively
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Mass and Moment of inertia are equivalent quantities.
Answer
Correct Answer:
True
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What will be the transfer function of a body of mass M, in which input quantity is force and output quantity is displacement?
Answer
Correct Answer:
1/( s2 M)
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Failure rate for safety valve working for 400 hours is 3 x 10–6 failures/hour. What is the reliability of safety valve?
Answer
Correct Answer:
0.998
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If a relief valve has reliability of 0.989, how many failures are expected in testing 1000 such relief valves?
Answer
Correct Answer:
11
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What is meant by mean time to failure (MTTF)?
Answer
Correct Answer:
Sum of survival time for number of components divided by number of failures
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A plain carbon steel has mean yield strength of 300 N/mm2 and standard deviation of 50 N/mm2. What is the mean and standard deviation of margin of safety, if mean tensile stress of 250 N/mm2 and standard deviation of 65 N/mm2 acts on it?
Answer
Correct Answer:
50 N/mm2, 82 N/mm2
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What causes infant mortality in mechanical equipments?
Answer
Correct Answer:
All of the above
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Which of the following statements is true for structure/speed diagrams?
Answer
Correct Answer:
Speed diagrams consider motor speed
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What is the purpose of using a gear box?
Answer
Correct Answer:
All of the above
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Ratio of two spindle speeds is constant in _________ progression.
Answer
Correct Answer:
Geometric
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What is harmonic progression?
Answer
Correct Answer:
Difference between two successive spindle speeds is constant
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Diameter range is high in geometric progression due to _________ spindle speed.
Answer
Correct Answer:
Low
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Which belt conveyor prevents sliding down of material at an inclination of 55o with horizontal?
Answer
Correct Answer:
Blanket belt conveyor
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What are bulk loads?
Answer
Correct Answer:
Single rigid mass
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Which of the following is not a hoisting equipment with lifting gear?
Answer
Correct Answer:
Troughed belts
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Which of the following is a property of bulk load?
Answer
Correct Answer:
Cake forming tendency
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What are the factors affecting selection of casting process?
Answer
Correct Answer:
Both a. and b.
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In forging process, forging plane is the plane __________
Answer
Correct Answer:
Perpendicular to die motion
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Which of the following processes is used for surface finishing?
Answer
Correct Answer:
Lapping
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Which of the following statements is/are true about safety/risk?
Answer
Correct Answer:
Danger is combination of risk and hazard
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Which of the following ergonomic factors are encountered in engineering applications?
Answer
Correct Answer:
Fatigue
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