Engineering 4th Class Part A Exam 2023 with 100% correct answers
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Course
ESB
Institution
ESB
Velocity (m/s) - correct answer Change in position / time
Acceleration (m/s^2) - correct answer Change in velocity (m/s) / time (s)
Force (Newton) - correct answer mass (kg) x acceleration (m/s^2) , any action on a body that tends to change its size, shape, or its state of rest or motio...
Engineering 4th Class Part A Exam 2023
with 100% correct answers
Velocity (m/s) - correct answer Change in position / time
Acceleration (m/s^2) - correct answer Change in velocity (m/s) / time (s)
Force (Newton) - correct answer mass (kg) x acceleration (m/s^2) , any action on a body that tends to
change its size, shape, or its state of rest or motion
Force of Gravity - correct answer mass (kg) x 9.81 m/s^2
Pressure (Pa) - correct answer Force (N) / area (m^2)
Work (J) - correct answer Force (N) x distance (m)
Power - correct answer Work done / time , Rate of doing work
Potential Energy (J) - correct answer mass x gravity x height , the ability of a body to do work due by
virtue of its position
Kinetic Energy (J) - correct answer 1/2 x mass x velocity^2 , The ability of a body to do work due to its
motion
Energy (J) - correct answer The capacity of a body to do work
,Tonne - correct answer 1000 kilograms
Moment of Force (Nm) - correct answer Force (N) x Distance (m) , A force, acting on a body at any
distance from a point on that body, will tend to produce rotation around that point
Clockwise Moments - correct answer Equal to Counter-clockwise moments
Upward Forces - correct answer Equal to Downward forces
Static Friction - correct answer A friction force that acts on objects that are not moving. Always greater
than kinetic friction
Kinetic Friction - correct answer Friction that opposes motion once the motion has already started. Not
affected by speed of body Always greater than rolling friction.
Rolling Friction - correct answer The friction force that acts on rolling objects, Always less than kinetic
friction
Fluid Friction - correct answer Friction that occurs as an object moves through a fluid
Force of Friction - correct answer Force that resists motion when two materials are in contact.
Proportional to the force that presses the two surfaces together. Not affected by area. Affected by
roughness.
Elasticity - correct answer The ability of a material to return to its original shape after being disturbed
Stiffness - correct answer Ability of a material to resist a change in shape or size when a load is applied
, Plasticity - correct answer Ability of a material to retain its deformed shape when a deforming force is
removed
Ductility - correct answer Ability of a material to be stretched and reduced in cross section without
breaking
Toughness - correct answer Ability of a material to absorb energy before breaking
Hardness - correct answer Ability of a material to resist penetration
Stress - correct answer Internal resistance to an external load , Equal to Load (N) / Area (m^2)
Tensile Stress - correct answer Forces that act at opposite ends of a bar and pull away from each other,
creating tension on the bar
Compressive Stress - correct answer A stress due to a force pushing together on a body
Shear Stress - correct answer Forces on a bar that act parallel to another but are not on the same plane
Ultimate Stress - correct answer The stress at which fracture of the material occurs
Allowable Stress - correct answer The greatest stress which a material is capable of developing without
permanent deformation remaining upon the complete release of stress.
Elastic Limit - correct answer Maximum stress that a material will withstand without permanent
deformation. Will return to its original size and shape
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