4th Class Power Engineering Part A
Exam With All Verified solutions| All
Correct And Approved
Velocity (m/s) - Ans--Change in position / time
Acceleration (m/s^2) - Ans--Change in velocity (m/s) / time (s)
Force (Newton) - Ans--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 - Ans--mass (kg) x 9.81 m/s^2
Pressure (Pa) - Ans--Force (N) / area (m^2)
Work (J) - Ans--Force (N) x distance (m)
Power - Ans--Work done / time , Rate of doing work
Potential Energy (J) - Ans--mass x gravity x height , the ability of a body to do
work due by virtue of its position
Kinetic Energy (J) - Ans--1/2 x mass x velocity^2 , The ability of a body to do
work due to its motion
Energy (J) - Ans--The capacity of a body to do work
Tonne - Ans--1000 kilograms
Moment of Force (Nm) - Ans--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 - Ans--Equal to Counter-clockwise moments
,Upward Forces - Ans--Equal to Downward forces
Actual Mechanical Advantage (Ma) - Ans--Load (N) / Effort (N)
Velocity Ratio (VR) - Ans--Distance moved by Effort / Distance moved by
Load
Efficiency - Ans--Output Work / Input Work
Output Work - Ans--Load x Distance moved by load
Input Work - Ans--Effort x Distance moved by effort , Equals Output work +
Wasted work
Ideal Mechanical Advantage (MA) - Ans--Equal to Velocity Ratio (VR)
Load x r - Ans--Equal to Effort x R
VR - Ans--Equal to R/r and D/d
Load /Effort - Ans--Equal to R/r
Scalar - Ans--A physical quantity that has magnitude but no direction
Vector - Ans--A quantity that has magnitude and direction
Space Diagram - Ans--Illustrates a system of vectors
Co-planar Vectors - Ans--Vectors that are all in the same plane
Concurrent Vectors - Ans--Vectors whose lines of action meet at one point
Resultant - Ans--A vector that represents the sum of two or more vectors
Absolute Pressure - Ans--Atmospheric pressure + gauge pressure
Static Friction - Ans--A friction force that acts on objects that are not moving.
Always greater than kinetic friction
,Kinetic Friction - Ans--Friction that opposes motion once the motion has
already started. Not affected by speed of body Always greater than rolling
friction.
Rolling Friction - Ans--The friction force that acts on rolling objects, Always
less than kinetic friction
Fluid Friction - Ans--Friction that occurs as an object moves through a fluid
Force of Friction - Ans--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 - Ans--The ability of a material to return to its original shape after
being disturbed
Stiffness - Ans--Ability of a material to resist a change in shape or size when
a load is applied
Plasticity - Ans--Ability of a material to retain its deformed shape when a
deforming force is removed
Ductility - Ans--Ability of a material to be stretched and reduced in cross
section without breaking
Toughness - Ans--Ability of a material to absorb energy before breaking
Hardness - Ans--Ability of a material to resist penetration
Stress - Ans--Internal resistance to an external load , Equal to Load (N) /
Area (m^2)
Tensile Stress - Ans--Forces that act at opposite ends of a bar and pull away
from each other, creating tension on the bar
Compressive Stress - Ans--A stress due to a force pushing together on a
body
, Shear Stress - Ans--Forces on a bar that act parallel to another but are not
on the same plane
Ultimate Stress - Ans--The stress at which fracture of the material occurs
Allowable Stress - Ans--The greatest stress which a material is capable of
developing without permanent deformation remaining upon the complete
release of stress.
Elastic Limit - Ans--Maximum stress that a material will withstand without
permanent deformation. Will return to its original size and shape
Factor of Safety - Ans--Ultimate Stress / Allowable Stress
Strain - Ans--A measure of the deformation produced in a member by a load
, Equal to Change in Length (l) / Original Length (L)
Circumferance - Ans--pi x Diameter
Linear Speed - Ans--Equal to rev/min x pi D / 60
Four States of Matter - Ans--solid, liquid, gas, plasma
Phase - Ans--One individual substance in one particular state
Chemical Properties - Ans--Only observed when there is a chemical
change or reaction , Examples are Heat of combustion, Toxicity,
Flammability, Chemical Stability
Physical Properties - Ans--Characteristics that you can observe without a
change in the composition of matter
Intensive Physical Property - Ans--Not dependent on the amount of matter
Extensive Physical Property - Ans--Dependent on the amount of matter
Exam With All Verified solutions| All
Correct And Approved
Velocity (m/s) - Ans--Change in position / time
Acceleration (m/s^2) - Ans--Change in velocity (m/s) / time (s)
Force (Newton) - Ans--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 - Ans--mass (kg) x 9.81 m/s^2
Pressure (Pa) - Ans--Force (N) / area (m^2)
Work (J) - Ans--Force (N) x distance (m)
Power - Ans--Work done / time , Rate of doing work
Potential Energy (J) - Ans--mass x gravity x height , the ability of a body to do
work due by virtue of its position
Kinetic Energy (J) - Ans--1/2 x mass x velocity^2 , The ability of a body to do
work due to its motion
Energy (J) - Ans--The capacity of a body to do work
Tonne - Ans--1000 kilograms
Moment of Force (Nm) - Ans--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 - Ans--Equal to Counter-clockwise moments
,Upward Forces - Ans--Equal to Downward forces
Actual Mechanical Advantage (Ma) - Ans--Load (N) / Effort (N)
Velocity Ratio (VR) - Ans--Distance moved by Effort / Distance moved by
Load
Efficiency - Ans--Output Work / Input Work
Output Work - Ans--Load x Distance moved by load
Input Work - Ans--Effort x Distance moved by effort , Equals Output work +
Wasted work
Ideal Mechanical Advantage (MA) - Ans--Equal to Velocity Ratio (VR)
Load x r - Ans--Equal to Effort x R
VR - Ans--Equal to R/r and D/d
Load /Effort - Ans--Equal to R/r
Scalar - Ans--A physical quantity that has magnitude but no direction
Vector - Ans--A quantity that has magnitude and direction
Space Diagram - Ans--Illustrates a system of vectors
Co-planar Vectors - Ans--Vectors that are all in the same plane
Concurrent Vectors - Ans--Vectors whose lines of action meet at one point
Resultant - Ans--A vector that represents the sum of two or more vectors
Absolute Pressure - Ans--Atmospheric pressure + gauge pressure
Static Friction - Ans--A friction force that acts on objects that are not moving.
Always greater than kinetic friction
,Kinetic Friction - Ans--Friction that opposes motion once the motion has
already started. Not affected by speed of body Always greater than rolling
friction.
Rolling Friction - Ans--The friction force that acts on rolling objects, Always
less than kinetic friction
Fluid Friction - Ans--Friction that occurs as an object moves through a fluid
Force of Friction - Ans--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 - Ans--The ability of a material to return to its original shape after
being disturbed
Stiffness - Ans--Ability of a material to resist a change in shape or size when
a load is applied
Plasticity - Ans--Ability of a material to retain its deformed shape when a
deforming force is removed
Ductility - Ans--Ability of a material to be stretched and reduced in cross
section without breaking
Toughness - Ans--Ability of a material to absorb energy before breaking
Hardness - Ans--Ability of a material to resist penetration
Stress - Ans--Internal resistance to an external load , Equal to Load (N) /
Area (m^2)
Tensile Stress - Ans--Forces that act at opposite ends of a bar and pull away
from each other, creating tension on the bar
Compressive Stress - Ans--A stress due to a force pushing together on a
body
, Shear Stress - Ans--Forces on a bar that act parallel to another but are not
on the same plane
Ultimate Stress - Ans--The stress at which fracture of the material occurs
Allowable Stress - Ans--The greatest stress which a material is capable of
developing without permanent deformation remaining upon the complete
release of stress.
Elastic Limit - Ans--Maximum stress that a material will withstand without
permanent deformation. Will return to its original size and shape
Factor of Safety - Ans--Ultimate Stress / Allowable Stress
Strain - Ans--A measure of the deformation produced in a member by a load
, Equal to Change in Length (l) / Original Length (L)
Circumferance - Ans--pi x Diameter
Linear Speed - Ans--Equal to rev/min x pi D / 60
Four States of Matter - Ans--solid, liquid, gas, plasma
Phase - Ans--One individual substance in one particular state
Chemical Properties - Ans--Only observed when there is a chemical
change or reaction , Examples are Heat of combustion, Toxicity,
Flammability, Chemical Stability
Physical Properties - Ans--Characteristics that you can observe without a
change in the composition of matter
Intensive Physical Property - Ans--Not dependent on the amount of matter
Extensive Physical Property - Ans--Dependent on the amount of matter
