Power Engineering 3A1 Exam Review '23
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
b - CORRECT ANSWER The difference between a vector and a scalar is that:
a. The scalar is a quantitative measure while vector is a sign only.
b. The vector is not only a quantitative measure but also requires a directional indication
while scalar is a quantitative measure only.
c. The scalar is not only a quantitative measure but also requires a directional indication while
vector is a quantitative measure only.
d. The unit must be used for vectors.
c - CORRECT ANSWER A displacement of 9 m north of point A, and another of 6 m
west of point A can be added to produce a resultant displacement of:
a. 3 m N of W
b. 10 m N of W
c. 10.8 m N of W
d. 12.5 m N of W
d - CORRECT ANSWER Any vector may be considered to be made up of two or more
other vectors which are called the:
a. Resultants
b. Scalar quantities of the resultant
c. Static of motion
d. Components of the original vector
,a - CORRECT ANSWER An aircraft flies at 20° North of West at 100 km/h. The
east/west component of the velocity vector is:
a. 94 km/h west
b. 34.2 km/h west
c. 36.4 km/h west
d. 30.3 km/h east
b - CORRECT ANSWER A wooden box is loaded and its mass is 40 kg. A force of 150
N just sets it in motion. If this force is increased to 170 N, what will occur?
a. The wooden box will move faster at steady velocity.
b. The wooden box will accelerate.
c. The wooden box will slow down.
d. The wooden box will stop.
d - CORRECT ANSWER A block of stone of 40 kg is hauled along a horizontal floor
by a force inclined 20° to the horizontal. If the coefficient of friction between the stone and
the floor is 0.3, determine the effort required to just move the stone from rest.
a. 157.77N
b. 140.63 N
c. 117.72 N
d. 112.9 N
c - CORRECT ANSWER When the co-efficient of friction increases, and the force
between the two surfaces remains constant, the friction force will?
a. Remain constant
b. Decrease
, c. Increase
d. Decrease exponentially
a - CORRECT ANSWER Displacement is:
a. A vector quantity
b. Speed multiplied by time
c. A scalar quantity
d. Acceleration divided by time
c - CORRECT ANSWER Average velocity is determined by:
a. V = v/2
b. V = u + 2a s2
c. V = (u + v)/2
d. V = u - at
b - CORRECT ANSWER A word, which refers to change in the position of a body,
relative to some reference point is:
a. Magnitude
b. Displacement
c. Direction
d. Distance
c - CORRECT ANSWER The potential energy contained in a mass of 20 kg located 15
meters above ground level is:
a. 2.934 J
UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
b - CORRECT ANSWER The difference between a vector and a scalar is that:
a. The scalar is a quantitative measure while vector is a sign only.
b. The vector is not only a quantitative measure but also requires a directional indication
while scalar is a quantitative measure only.
c. The scalar is not only a quantitative measure but also requires a directional indication while
vector is a quantitative measure only.
d. The unit must be used for vectors.
c - CORRECT ANSWER A displacement of 9 m north of point A, and another of 6 m
west of point A can be added to produce a resultant displacement of:
a. 3 m N of W
b. 10 m N of W
c. 10.8 m N of W
d. 12.5 m N of W
d - CORRECT ANSWER Any vector may be considered to be made up of two or more
other vectors which are called the:
a. Resultants
b. Scalar quantities of the resultant
c. Static of motion
d. Components of the original vector
,a - CORRECT ANSWER An aircraft flies at 20° North of West at 100 km/h. The
east/west component of the velocity vector is:
a. 94 km/h west
b. 34.2 km/h west
c. 36.4 km/h west
d. 30.3 km/h east
b - CORRECT ANSWER A wooden box is loaded and its mass is 40 kg. A force of 150
N just sets it in motion. If this force is increased to 170 N, what will occur?
a. The wooden box will move faster at steady velocity.
b. The wooden box will accelerate.
c. The wooden box will slow down.
d. The wooden box will stop.
d - CORRECT ANSWER A block of stone of 40 kg is hauled along a horizontal floor
by a force inclined 20° to the horizontal. If the coefficient of friction between the stone and
the floor is 0.3, determine the effort required to just move the stone from rest.
a. 157.77N
b. 140.63 N
c. 117.72 N
d. 112.9 N
c - CORRECT ANSWER When the co-efficient of friction increases, and the force
between the two surfaces remains constant, the friction force will?
a. Remain constant
b. Decrease
, c. Increase
d. Decrease exponentially
a - CORRECT ANSWER Displacement is:
a. A vector quantity
b. Speed multiplied by time
c. A scalar quantity
d. Acceleration divided by time
c - CORRECT ANSWER Average velocity is determined by:
a. V = v/2
b. V = u + 2a s2
c. V = (u + v)/2
d. V = u - at
b - CORRECT ANSWER A word, which refers to change in the position of a body,
relative to some reference point is:
a. Magnitude
b. Displacement
c. Direction
d. Distance
c - CORRECT ANSWER The potential energy contained in a mass of 20 kg located 15
meters above ground level is:
a. 2.934 J
