4TH CLASS POWER ENGINEERING
EXAM QUESTIONS |GUARANTEED
PASS
Velocity (m/s) - Accurate Answers✔✔✔ Change in position / time
Acceleration (m/s^2) - Accurate Answers✔✔✔ Change in velocity (m/s)
/ time (s)
Force (Newton) - Accurate Answers✔✔✔ 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 - Accurate Answers✔✔✔ mass (kg) x 9.81 m/s^2
Pressure (Pa) - Accurate Answers✔✔✔ Force (N) / area (m^2)
Work (J) - Accurate Answers✔✔✔ Force (N) x distance (m)
Power - Accurate Answers✔✔✔ Work done / time , Rate of doing work
Potential Energy (J) - Accurate Answers✔✔✔ mass x gravity x height ,
the ability of a body to do work due by virtue of its position
,Kinetic Energy (J) - Accurate Answers✔✔✔ 1/2 x mass x velocity^2 ,
The ability of a body to do work due to its motion
Energy (J) - Accurate Answers✔✔✔ The capacity of a body to do work
Tonne - Accurate Answers✔✔✔ 1000 kilograms
Moment of Force (Nm) - Accurate Answers✔✔✔ 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 - Accurate Answers✔✔✔ Equal to Counter-
clockwise moments
Upward Forces - Accurate Answers✔✔✔ Equal to Downward forces
Actual Mechanical Advantage (Ma) - Accurate Answers✔✔✔ Load
(N) / Effort (N)
Velocity Ratio (VR) - Accurate Answers✔✔✔ Distance moved by Effort
/ Distance moved by Load
Efficiency - Accurate Answers✔✔✔ Output Work / Input Work
Output Work - Accurate Answers✔✔✔ Load x Distance moved by load
,Input Work - Accurate Answers✔✔✔ Effort x Distance moved by
effort , Equals Output work + Wasted work
Ideal Mechanical Advantage (MA) - Accurate Answers✔✔✔ Equal to
Velocity Ratio (VR)
Load x r - Accurate Answers✔✔✔ Equal to Effort x R
VR - Accurate Answers✔✔✔ Equal to R/r and D/d
Load /Effort - Accurate Answers✔✔✔ Equal to R/r
Scalar - Accurate Answers✔✔✔ A physical quantity that has magnitude
but no direction
Vector - Accurate Answers✔✔✔ A quantity that has magnitude and
direction
Space Diagram - Accurate Answers✔✔✔ Illustrates a system of vectors
Co-planar Vectors - Accurate Answers✔✔✔ Vectors that are all in the
same plane
, Concurrent Vectors - Accurate Answers✔✔✔ Vectors whose lines of
action meet at one point
Resultant - Accurate Answers✔✔✔ A vector that represents the sum of
two or more vectors
Absolute Pressure - Accurate Answers✔✔✔ Atmospheric pressure +
gauge pressure
Static Friction - Accurate Answers✔✔✔ A friction force that acts on
objects that are not moving. Always greater than kinetic friction
Kinetic Friction - Accurate Answers✔✔✔ Friction that opposes motion
once the motion has already started. Not affected by speed of body
Always greater than rolling friction.
Rolling Friction - Accurate Answers✔✔✔ The friction force that acts on
rolling objects, Always less than kinetic friction
Fluid Friction - Accurate Answers✔✔✔ Friction that occurs as an object
moves through a fluid
Force of Friction - Accurate Answers✔✔✔ 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.
EXAM QUESTIONS |GUARANTEED
PASS
Velocity (m/s) - Accurate Answers✔✔✔ Change in position / time
Acceleration (m/s^2) - Accurate Answers✔✔✔ Change in velocity (m/s)
/ time (s)
Force (Newton) - Accurate Answers✔✔✔ 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 - Accurate Answers✔✔✔ mass (kg) x 9.81 m/s^2
Pressure (Pa) - Accurate Answers✔✔✔ Force (N) / area (m^2)
Work (J) - Accurate Answers✔✔✔ Force (N) x distance (m)
Power - Accurate Answers✔✔✔ Work done / time , Rate of doing work
Potential Energy (J) - Accurate Answers✔✔✔ mass x gravity x height ,
the ability of a body to do work due by virtue of its position
,Kinetic Energy (J) - Accurate Answers✔✔✔ 1/2 x mass x velocity^2 ,
The ability of a body to do work due to its motion
Energy (J) - Accurate Answers✔✔✔ The capacity of a body to do work
Tonne - Accurate Answers✔✔✔ 1000 kilograms
Moment of Force (Nm) - Accurate Answers✔✔✔ 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 - Accurate Answers✔✔✔ Equal to Counter-
clockwise moments
Upward Forces - Accurate Answers✔✔✔ Equal to Downward forces
Actual Mechanical Advantage (Ma) - Accurate Answers✔✔✔ Load
(N) / Effort (N)
Velocity Ratio (VR) - Accurate Answers✔✔✔ Distance moved by Effort
/ Distance moved by Load
Efficiency - Accurate Answers✔✔✔ Output Work / Input Work
Output Work - Accurate Answers✔✔✔ Load x Distance moved by load
,Input Work - Accurate Answers✔✔✔ Effort x Distance moved by
effort , Equals Output work + Wasted work
Ideal Mechanical Advantage (MA) - Accurate Answers✔✔✔ Equal to
Velocity Ratio (VR)
Load x r - Accurate Answers✔✔✔ Equal to Effort x R
VR - Accurate Answers✔✔✔ Equal to R/r and D/d
Load /Effort - Accurate Answers✔✔✔ Equal to R/r
Scalar - Accurate Answers✔✔✔ A physical quantity that has magnitude
but no direction
Vector - Accurate Answers✔✔✔ A quantity that has magnitude and
direction
Space Diagram - Accurate Answers✔✔✔ Illustrates a system of vectors
Co-planar Vectors - Accurate Answers✔✔✔ Vectors that are all in the
same plane
, Concurrent Vectors - Accurate Answers✔✔✔ Vectors whose lines of
action meet at one point
Resultant - Accurate Answers✔✔✔ A vector that represents the sum of
two or more vectors
Absolute Pressure - Accurate Answers✔✔✔ Atmospheric pressure +
gauge pressure
Static Friction - Accurate Answers✔✔✔ A friction force that acts on
objects that are not moving. Always greater than kinetic friction
Kinetic Friction - Accurate Answers✔✔✔ Friction that opposes motion
once the motion has already started. Not affected by speed of body
Always greater than rolling friction.
Rolling Friction - Accurate Answers✔✔✔ The friction force that acts on
rolling objects, Always less than kinetic friction
Fluid Friction - Accurate Answers✔✔✔ Friction that occurs as an object
moves through a fluid
Force of Friction - Accurate Answers✔✔✔ 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.
