The production of large quantities of a standardized article (often using assembly line techniques)
Answer
Correct Answer:
Mass production
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Is done when a force acts on an object to make that object move - a transfer of energy
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Correct Answer:
Work
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Required a large shift in population from rural areas to the cities.
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Correct Answer:
The Industrial Revolution
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Use the force of a liquid in a confined space - apply two essential characteristic of fluids - their incompressibility and their ability to transmit pressure
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Correct Answer:
Hydraulic systems
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Consists of a wire - rope - or cable moving on a grooved wheel. One or more combinations of wheels and ropes can be fixed in place or moveable - help you lift larger loads.
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Correct Answer:
Pulley
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Do not seal the gas (usually air)
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Correct Answer:
Pneumatic systems
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Do the work easier
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Correct Answer:
Effort advantage
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Comfort is an important consideration when designing a machine or improving upon an existing machine. The science that designs machines for comfort is called ...
Answer
Correct Answer:
Ergonomics
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During the research phase, when a device is improved upon, certain criteria are taken into account. Of the criteria listed below, which would be the least important ...
Answer
Correct Answer:
Convenience
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In early times, people with buckets usually transported water from one place to another. A scientist later invented a device to make it easier, which used the motion of a simple machine.
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Correct Answer:
Archimedes screw
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In the hydraulic lift from the previous question (Question # 31) the advantage is force and the disadvantage is...
Answer
Correct Answer:
Distance
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If the area of the small piston on the left is 0.5m2 and the area of the large piston is 5.5m2, The mechanical advantage of the illustrated hydraulic lift here would be ...
Answer
Correct Answer:
11
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A cherry picker uses hydraulics to raise a working platform. 10N of force are applied to the small piston in the hydraulic system to raise a load of 50N (on the large piston) a distance of 0.5m. How far would the small piston have to be pushed to accomplish this task?
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Correct Answer:
2.5 m
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Pascal’s law states that ...
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Correct Answer:
Pressure exerted on a contained fluid is transmitted equally in all directions
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Crash test dummies are used to test safety in vehicles. The reason for this is because they are ....
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Correct Answer:
Non-living
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The heel of a stiletto shoe can exert a lot of pressure. If the area of the heel is 0.5cm2 and a force of 200N is exerted using the heel, what is the pressure exerted by the heel?
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Correct Answer:
400 Pa
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To calculate pressure the formula used is P = F / A. Units of pressure are ...
Answer
Correct Answer:
Pascals
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When a skater moves across an ice surface, a thin layer of water is created, allowing the skate blade to slide across the surface with little friction. This layer of water is produced by the pressure of the ....
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Correct Answer:
Skate blade
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Efficiency can be increased by reducing frictional force. A sport that tries to reduce frictional force by sweeping the ice in front of the rock is ...
Answer
Correct Answer:
Curling
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( Efficiency = work output / work input ) A pulley system lifts a 100N load with a force of 20N. The input distance is 3m and the output distance is 0.5m. The efficiency of this pulley system is ...
Answer
Correct Answer:
83.3%
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The pedals on a bicycle are attached to sprocket gears which are linked together by a chain. The type of energy that describes the motion created when you apply force to the pedal is ...
Answer
Correct Answer:
D kinetic
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Using the gear train illustrated here to answer this question Identify the direction and speed of the 2nd follower gear if the driven gear is the 1st gear on the
Answer
Correct Answer:
Clockwise with a speed ratio of 1.34
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What is the polymerization of two or more chemically different monomers forming a long molecular chain?
Answer
Correct Answer:
Copolymerization
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With an increase in temperature, the resistance of a semiconductor _________
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Correct Answer:
Decreases
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Which of the following parameter is used to assess the magnetic ability of a material?
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Correct Answer:
Magnetic dipole moment
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Which of the following was not a classification of a subject taking the MFFT?
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Correct Answer:
Slow accurate
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Which of the following methods is best for detecting interior flaws in the castings?
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Correct Answer:
Ultrasonic inspection
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Which of the following inspections is used for detecting invisible surface defects in a nonmagnetic casting?
Answer
Correct Answer:
Dye penetrant inspection
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Which of the following processes is preferred for preparing aluminum ingots for the liquid penetrant testing method?
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Correct Answer:
Acid pickling
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Which of the following types of light is preferred for using fluorescent penetrant in liquid penetrant testing (LPT) method?
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Correct Answer:
Ultraviolet Light
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Which of the following methods is best for examining surface flaws on the castings?
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Correct Answer:
Visual Inspection
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Which of the following form of iron is magnetic?
Answer
Correct Answer:
α
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Iron possesses BCC crystal structure up to (in degree centigrade)?
Answer
Correct Answer:
768
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Which of the following is the hardest constituent of steel?
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Correct Answer:
Martensite
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Tensile strength of alloy steel can be improved by adding ______
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Correct Answer:
Nickel
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Which of the following induces fine-grain distribution in alloy steel?
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Correct Answer:
Vanadium
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Wrought iron is a product of ______
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Correct Answer:
Puddling furnace
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Cast iron is a product of _______
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Correct Answer:
Cupola
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The line joining a solid phase with liquid and solid phase mixture is known as ________
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Correct Answer:
Solidus
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The Line joining a liquid phase with liquid and solid phase mixture is known as ________
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Correct Answer:
Liquidus
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The invariant reaction involving a liquid phase decomposing into two different solids on cooling is known as _____
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Correct Answer:
Eutectic point
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Which equation represents the Gibbs phase rule?
Answer
Correct Answer:
F = C - P + 2
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Which of the following methods is most efficient method of design of experiments (DOE)?
Answer
Correct Answer:
Taguchi method
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What will be the number of tests required in an experiment to obtain maximum information based on factorial design if, number of levels and number of factors are 2 and 5 respectively?
Answer
Correct Answer:
32
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In which of the following designs, system provides its minimum critical function even after failure of the component?
Answer
Correct Answer:
Fail operational design
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Selection of welding process does not depend on ___________
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Correct Answer:
None of the above
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Which of the following parameters are to be considered for parts with non rotational symmetry in machining process?
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Correct Answer:
All of the above
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Which criteria of failure is used to indicate St Venent’s theory?
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Correct Answer:
Maximum principle strain theory
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The ratio of di / t for thick cylinder is __________
Answer
Correct Answer:
Less than 20
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A cylinder made of plain carbon steel has inner diameter 100 mm. What is the thickness of cylinder if maximum internal pressure of 20 Mpa acts on it? ( σall = 100 N/mm2 & poisson’s ratio = 0.3)
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Correct Answer:
11 mm
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What does DFMA stand for?
Answer
Correct Answer:
Both a. and b.
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Which of the following principle recognizes human capabilities and limitations using design effective handling equipment?
Answer
Correct Answer:
Ergonomic principle
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Which type of welded joints are not included in class 3 pressure vessels?
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Correct Answer:
Single full fillet lap joints
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Class 3 pressure vessels having welded joints are __________
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Correct Answer:
Not radio-graphed
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Design pressure for unfired pressure vessels is 1.05 times of _______
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Correct Answer:
Maximum working pressure
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Internal pressure of 2.5 Mpa acts on a pressure vessel of thickness 15 mm and internal diameter of 1500 mm. What is the stress induced in longitudinal direction?
Answer
Correct Answer:
65.62 N/mm2
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Which type of formed threads are used for vertical pressure vessels in the pressure range of 0.1 N/mm2 to 1.5 N/mm2?
Answer
Correct Answer:
Torispherical dished head
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Single cylinder four stroke engine has brake power of 8 kW and brake mean effective pressure of 0.55 Mpa. What is the length of cylinder which is 1.2 times of bore diameter? (n = 3000 rpm)
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Correct Answer:
103 mm
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Which of the following parts of piston act as bearing for connecting rod side thrust?
Answer
Correct Answer:
Piston skirt
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What is the function of gudgeon pin?
Answer
Correct Answer:
Connects piston to connecting rod
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A piston has allowable tensile stress of 50 N/mm2 and has bore diameter 150 mm. Considering strength of piston, what will be the thickness of piston head if maximum pressure of 10 N/mm2 acts on it?
Answer
Correct Answer:
29 mm
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A piston made of gray cast iron has piston head thickness of 20 mm. What will be thickness of piston barrel under piston rings if it has allowable tensile stress of 30 N/mm2? ( Bore diameter = 50 mm & Pmax =15 N/mm2)
Answer
Correct Answer:
20 mm
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What force opposes motion motion and decreases the efficiency of a machine?
Answer
Correct Answer:
Friction
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How much work is done if I use 5 Newtons to move an object 2 meters?
Answer
Correct Answer:
10 Joules
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How could I reduce the effort force needed to lift the load?
Answer
Correct Answer:
Move the fulcrum closer to the load
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Using an inclined plane makes the distance of an object ________, but the amount of work is _________ to move the object.
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Correct Answer:
Increase, descreased
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What is the definition for mechanical advantage?
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Correct Answer:
The number of times a machine increases the input force
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Which of the following does a simple machine do?
Answer
Correct Answer:
All of the above
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The fixed point on the lever is called
Answer
Correct Answer:
Fulcrum
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What type of simple machine is this?
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Correct Answer:
Wheel and axle
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What type of simple machine is found on the cap of a pickle jar?
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Correct Answer:
Screw
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Stairs
Answer
Correct Answer:
Inclined plane
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A device that has two or more simple machines working together
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Correct Answer:
Compound (complex) machine
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A seesaw is an example of a
Answer
Correct Answer:
Lever
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An axe is an example of a
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Wedge
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A simple machine that consists a rigid bar that pivot about a fixed point
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Correct Answer:
Lever
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An inclined plane wrapped around a rod forms this simple machine
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Correct Answer:
Screw
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A flat sloping surface that connects lower and higher elevations. It makes raising objects easier.
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Correct Answer:
Inclined plane
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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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A force that opposes the movement of one solid in contact with another solid.
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Correct Answer:
Friction
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To push or pull an object
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Correct Answer:
Force
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If the output (driven) gear is smaller than the input (drive) gear, the speed will
Answer
Correct Answer:
Increase
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Work done by machine / work done to make the machine operate x100
Answer
Correct Answer:
Formula for efficiency
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The ratio of the output to the input of any system - a comparison of the useful work provided by a machine or a system with - the work supplied to the machine or system
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Correct Answer:
Efficiency
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Transferred to kinetic energy in machines in a dam to generate electrical energy
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Correct Answer:
Gravitational potential energy
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Or ramp - makes it easier to move a load higher than it is - but - it has to be moved over a much longer distance.
Answer
Correct Answer:
Inclined plane
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A rigid bar or plank that can rotate around a fixed point
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Correct Answer:
Lever
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Stored energy
Answer
Correct Answer:
Potential energy
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Do the work faster
Answer
Correct Answer:
Speed advantage
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A small gear driving a larger gear increases torque and reduces speed in the driven gear
Answer
Correct Answer:
Reducing gears
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Heated water to make steam and then used to move a piston. When the piston moved - it caused an attached rod (which was connected to a crankshaft) to move as well - making the engine work.
Answer
Correct Answer:
Steam engine
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Distance between the fulcrum and the load
Answer
Correct Answer:
Load arm
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The fluid transfers the pressure from the input piston to the ____________
Answer
Correct Answer:
Output piston
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Within a machine are groups of parts that perform specific functions - such as braking or steering
Answer
Correct Answer:
Subsystems
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Distance between the fulcrum and the effort force
Answer
Correct Answer:
Effort arm
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Used to control the flow of a fluid. It is a moveable part that controls the flow by opening or closing
Answer
Correct Answer:
Valve
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The rate of motion that an object changes position
Answer
Correct Answer:
Speed
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Energy is transferred from one place to another - and no energy is changed or converted.
Answer
Correct Answer:
Transmission
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A large gear driving a smaller gear decreases torque and increases speed in the driven gear
Answer
Correct Answer:
Multiplying gears
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Bigger gear
Answer
Correct Answer:
Driving gear
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