Power Engineering - 4A Megatest 2
Questions And Correct Solutions|
Detailed And Verified
(4-012-1.9) Coplanar vectors all occur in the same:
a. Plane
b. Direction
c. Magnitude
d. Velocity - Ans--a. Plane
(4-015-2.3) Find the mass of the refrigerator that is just started moving by a
force of 6350N along a tile floor with a coefficient of friction of 0.30.
a. 2157.66 kg
b. 21.2 tonnes
c. 1905 kg
d. 0.04 g - Ans--a. 2157.66 kg
(4-013-2.4) A car travels a total of 350km. The journey involves a total of 3
hours driving time and 45 minutes of stop time. What is the average journey
speed?
a. 93.3 km/h
b. 71.7 km/h
c. 116.7 km/h
d. 107.7 km/h - Ans--a. 93.3 km/h
(4-009-2.2) The rate of doing work is called _________.
a. Power
b. Kinetic energy
c. Potential energy
,d. Work - Ans--a. Power
(4-010-2.3) A lever, 10m long, pivots at one end and has a load of 900 kg
suspended from the other end. What upward force must be applied at the
midpoint of the lever to obtain equilibrium?
a. 8829 N
b. 17 658 N
c. 882.9 N
d. 4414.4 N - Ans--b. 17 658 N
(4-015-2.1) Find the coefficient of friction between a 73kg cubic box
measuring 3m on each side and a hardwood floor, 16m long and 20m wide,
if a force of 236N is required to start the box moving. S
a. 0.33
b. 36 N
c. 3.20
d. 3.03 - Ans--a. 0.33
(4-009-2.5) The product, 'm x g x h', will result in the _______ energy of an
object.
a. Potential
b. Kinetic
c. Maximum
d. Minimum - Ans--a. Potential
(4-010-2.2) If a system is in equilibrium, which of the following statements is
true?
a. The system will not rotate because the moments in the system balance
each other.
b. The system will rotate counter-clockwise.
c. The system will not rotate because no force is being exerted.
d. The system will rotate under the largest force. - Ans--a. The system will
not rotate because the moments in the system balance each other.
,(4-011-1.11) A block and tackle system has 3 pulleys in each of two blocks.
If a downward effort of 100 N is applied and the machine has an efficiency of
83.6%, what is the maximum mass that can be lifted?
a. 501.6 kg
b. 51.1 kg
c. 5113.1 kg
d. 250 kg - Ans--b. 51.1 kg
(4-013-2.2) A train starts off from rest and reaches a velocity of 100km/h in 8
minutes. If the velocity increases uniformly, how far will the train travel
during the first 8 minutes?
a. 6.67 km
b. 7.43 km
c. 8.50 km
d. 9.25 km - Ans--a. 6.67 km
(4-016-2.9) A hollow cylinder with an OD of 100mm and an ID of 30mm,
supports a load of 100kN. What is the compressive stress in MPa?
a. 11
b. 13.99
c. 15.2
d. 16.34 - Ans--b. 13.99
(4-017-1.7) The input to a 93.33% efficient belt drive system is 75kW. What
is the output?
a. 75 kW
b. 70 kW
c. 80.36 kW
d. 72.5 Watts - Ans--b. 70 kW
(4-016-1.5) If engineers require a material that can be stretched and
reduced in cross-section without breaking, they would choose a material
that is:
, a. Ductile
b. Brittle
c. Plastic
d. Elastic - Ans--a. Ductile
(4-009-2.9) A uniformly applied force, acting at right angles to a surface,
divided by the surface area, is defined as:
a. Acceleration
b. Pressure
c. Weight
d. Surface area - Ans--b. Pressure
(4-012-1.1) A single vector that can replace a system of vectors and have
the same effect is called a:
a. Coplanar vector
b. Resultant
c. Concurrent vector
d. Equilibrant - Ans--b. Resultant
(4-010-2.4) A 12 m long bar is pivoted on the right end and a force of 150 N is
applied upwards on the left end. The magnitude of the resulting moment of
force is:
a. 12.5 Nm
b. 25 Nm
c. 1.8 kNm
d. 1800 kNm - Ans--c. 1.8 kNm
(4-013-2.3) An airplane travels 500km due west in 2 hours. Its average
velocity was:
a. 250 m/s due west
b. 4167 m/s
c. 69.4 m/s due west
d. 69.4 m/s - Ans--c. 69.4 m/s due west
Questions And Correct Solutions|
Detailed And Verified
(4-012-1.9) Coplanar vectors all occur in the same:
a. Plane
b. Direction
c. Magnitude
d. Velocity - Ans--a. Plane
(4-015-2.3) Find the mass of the refrigerator that is just started moving by a
force of 6350N along a tile floor with a coefficient of friction of 0.30.
a. 2157.66 kg
b. 21.2 tonnes
c. 1905 kg
d. 0.04 g - Ans--a. 2157.66 kg
(4-013-2.4) A car travels a total of 350km. The journey involves a total of 3
hours driving time and 45 minutes of stop time. What is the average journey
speed?
a. 93.3 km/h
b. 71.7 km/h
c. 116.7 km/h
d. 107.7 km/h - Ans--a. 93.3 km/h
(4-009-2.2) The rate of doing work is called _________.
a. Power
b. Kinetic energy
c. Potential energy
,d. Work - Ans--a. Power
(4-010-2.3) A lever, 10m long, pivots at one end and has a load of 900 kg
suspended from the other end. What upward force must be applied at the
midpoint of the lever to obtain equilibrium?
a. 8829 N
b. 17 658 N
c. 882.9 N
d. 4414.4 N - Ans--b. 17 658 N
(4-015-2.1) Find the coefficient of friction between a 73kg cubic box
measuring 3m on each side and a hardwood floor, 16m long and 20m wide,
if a force of 236N is required to start the box moving. S
a. 0.33
b. 36 N
c. 3.20
d. 3.03 - Ans--a. 0.33
(4-009-2.5) The product, 'm x g x h', will result in the _______ energy of an
object.
a. Potential
b. Kinetic
c. Maximum
d. Minimum - Ans--a. Potential
(4-010-2.2) If a system is in equilibrium, which of the following statements is
true?
a. The system will not rotate because the moments in the system balance
each other.
b. The system will rotate counter-clockwise.
c. The system will not rotate because no force is being exerted.
d. The system will rotate under the largest force. - Ans--a. The system will
not rotate because the moments in the system balance each other.
,(4-011-1.11) A block and tackle system has 3 pulleys in each of two blocks.
If a downward effort of 100 N is applied and the machine has an efficiency of
83.6%, what is the maximum mass that can be lifted?
a. 501.6 kg
b. 51.1 kg
c. 5113.1 kg
d. 250 kg - Ans--b. 51.1 kg
(4-013-2.2) A train starts off from rest and reaches a velocity of 100km/h in 8
minutes. If the velocity increases uniformly, how far will the train travel
during the first 8 minutes?
a. 6.67 km
b. 7.43 km
c. 8.50 km
d. 9.25 km - Ans--a. 6.67 km
(4-016-2.9) A hollow cylinder with an OD of 100mm and an ID of 30mm,
supports a load of 100kN. What is the compressive stress in MPa?
a. 11
b. 13.99
c. 15.2
d. 16.34 - Ans--b. 13.99
(4-017-1.7) The input to a 93.33% efficient belt drive system is 75kW. What
is the output?
a. 75 kW
b. 70 kW
c. 80.36 kW
d. 72.5 Watts - Ans--b. 70 kW
(4-016-1.5) If engineers require a material that can be stretched and
reduced in cross-section without breaking, they would choose a material
that is:
, a. Ductile
b. Brittle
c. Plastic
d. Elastic - Ans--a. Ductile
(4-009-2.9) A uniformly applied force, acting at right angles to a surface,
divided by the surface area, is defined as:
a. Acceleration
b. Pressure
c. Weight
d. Surface area - Ans--b. Pressure
(4-012-1.1) A single vector that can replace a system of vectors and have
the same effect is called a:
a. Coplanar vector
b. Resultant
c. Concurrent vector
d. Equilibrant - Ans--b. Resultant
(4-010-2.4) A 12 m long bar is pivoted on the right end and a force of 150 N is
applied upwards on the left end. The magnitude of the resulting moment of
force is:
a. 12.5 Nm
b. 25 Nm
c. 1.8 kNm
d. 1800 kNm - Ans--c. 1.8 kNm
(4-013-2.3) An airplane travels 500km due west in 2 hours. Its average
velocity was:
a. 250 m/s due west
b. 4167 m/s
c. 69.4 m/s due west
d. 69.4 m/s - Ans--c. 69.4 m/s due west
