ABSA 3B1 UPDATED COMPREHENSIVE EXAM QUESTIONS
AND ANSWERS SURE A+
✔✔A freight train travels a total distance of 125 km in 3 hours. What was its average
speed?:
a. 35.12 m/s
b. 32.51 m/s
c. 23.15 m/s
d. 11.57 m/s - ✔✔d. 11.57 m/s
✔✔A vehicle travelling at 120km/h increases its velocity uniformly to 90 km/h in 5
seconds. What is the acceleration in m/s2?:
a. 1.667
b. 0.667
c. 0.776
d. 1.776 - ✔✔a. 1.667
✔✔Determine the resultant of the following vectors. 100 N at 40 degrees + 50 N at 20
degrees:
a. 164.69 N
b. 147.96 N
c. 138.13 N
d. 123.58 N - ✔✔b. 147.96 N
✔✔This type of quantity has magnitude and direction:
a. vector
b. scalar
c. time
d. none of the listed - ✔✔a. vector
✔✔If the velocity ratio of a machine is 3, how far will an effort distance of 6m move a
load?:
a. 2m
b. 3m
c. 11m
d. 8m - ✔✔a. 2m
✔✔A machine lifts a 2200 N load a distance of 2m. If the effort applied is 200 N, what
distance will the effort move if efficiency is 82%?:
a. 28.63m
b. 26.83m
c. 23.68m
d. 20.86m - ✔✔b. 26.83m
,✔✔A wheel and axle has a wheel diameter of 300mm and an axle diameter of 50mm.
Calculate the mechanical advantage if efficiency is 92%:
a. 3.52
b. 4.53
c. 5.52
d. 6.52 - ✔✔c. 5.52
✔✔The _________ of a machine is the ratio of the distance moved by the effort to the
distance moved by the load:Select one:
a. velocity ratio
b. efficiency
c. ideal ratio
d. efficiency ratio - ✔✔a. velocity ratio
✔✔What load would be required, on a supported bar, at a point 4.2m to the left of a
pivot point to maintain equilibrium if a load of 850 N is located 3.2m to the right of the
pivot point?:
a.647.62N
b. 670.81N
c. 560.24N
d. 470.16N - ✔✔a. 647.62N
✔✔When several balanced forces act on a body and no change in movement takes
place, the system of forces is said to be in:
a. equilibrium
b. momentum
c. suspension
d. acceleration - ✔✔a. equilibrium
✔✔What force must be exerted to produce 2000 Pa on an area of .18m2?: Select one:
a. 3353 N
b. 6651 N
c. 6310 N
d. 3531.6 N - ✔✔d. 3531.6 N
✔✔If a force of 1 N is applied to a mass of 1 kg, then that mass will accelerate at
_________:
a. 10 m/s2
b. 1 m/s2
c. 9.81 m/s2
d. 100 m/s2 - ✔✔b. 1 m/s2
✔✔Velocity is equal to:
a. displacement / time
, b. distance / time
c. displacement × time
d. distance × time - ✔✔a. displacement / time
✔✔How long does it take a body to change velocity by 80 m/s at a rate of 5 m/s?:
a. 12 seconds
b. 16 seconds
c. 18 seconds
d. 22 seconds - ✔✔b. 16 seconds
✔✔79.Short retractable soot blowers usually penetrate the furnace waterwall
_________ through special openings:
a. 50 - 75 mm
b. 30 - 45 mm
c. 10 - 20 mm
d. 25 - 50 mm - ✔✔d. 25 - 50 mm
✔✔The inner tube on a soot blower lance __________, and conveys steam from the
poppet valve to the outer tube:
a. advances the lance tube into the boiler
b. rotates in a spiral fashion
c. remains stationary
d. forms a helical blowing pattern - ✔✔c. remains stationary
✔✔This is a pressure vessel that intercepts, cools and depressurizes boiler water in
order to protect municipal sewer systems:
a. blowby vessel
b. blowthrough vessel
c. blowoff vessel
d. blowdown separator - ✔✔c. blowoff vessel
✔✔To reduce the total solids concentration in the boiler water, this is done at all times:
a. coagulation
b. intermittent blowdown
c. chemical addition
d. continuous blowdown - ✔✔d. continuous blowdown
✔✔The water temperature at the blowoff tank outlet must not exceed _________
degrees C:
a. 75
b. 65
c. 85
d. 55 - ✔✔b. 65
AND ANSWERS SURE A+
✔✔A freight train travels a total distance of 125 km in 3 hours. What was its average
speed?:
a. 35.12 m/s
b. 32.51 m/s
c. 23.15 m/s
d. 11.57 m/s - ✔✔d. 11.57 m/s
✔✔A vehicle travelling at 120km/h increases its velocity uniformly to 90 km/h in 5
seconds. What is the acceleration in m/s2?:
a. 1.667
b. 0.667
c. 0.776
d. 1.776 - ✔✔a. 1.667
✔✔Determine the resultant of the following vectors. 100 N at 40 degrees + 50 N at 20
degrees:
a. 164.69 N
b. 147.96 N
c. 138.13 N
d. 123.58 N - ✔✔b. 147.96 N
✔✔This type of quantity has magnitude and direction:
a. vector
b. scalar
c. time
d. none of the listed - ✔✔a. vector
✔✔If the velocity ratio of a machine is 3, how far will an effort distance of 6m move a
load?:
a. 2m
b. 3m
c. 11m
d. 8m - ✔✔a. 2m
✔✔A machine lifts a 2200 N load a distance of 2m. If the effort applied is 200 N, what
distance will the effort move if efficiency is 82%?:
a. 28.63m
b. 26.83m
c. 23.68m
d. 20.86m - ✔✔b. 26.83m
,✔✔A wheel and axle has a wheel diameter of 300mm and an axle diameter of 50mm.
Calculate the mechanical advantage if efficiency is 92%:
a. 3.52
b. 4.53
c. 5.52
d. 6.52 - ✔✔c. 5.52
✔✔The _________ of a machine is the ratio of the distance moved by the effort to the
distance moved by the load:Select one:
a. velocity ratio
b. efficiency
c. ideal ratio
d. efficiency ratio - ✔✔a. velocity ratio
✔✔What load would be required, on a supported bar, at a point 4.2m to the left of a
pivot point to maintain equilibrium if a load of 850 N is located 3.2m to the right of the
pivot point?:
a.647.62N
b. 670.81N
c. 560.24N
d. 470.16N - ✔✔a. 647.62N
✔✔When several balanced forces act on a body and no change in movement takes
place, the system of forces is said to be in:
a. equilibrium
b. momentum
c. suspension
d. acceleration - ✔✔a. equilibrium
✔✔What force must be exerted to produce 2000 Pa on an area of .18m2?: Select one:
a. 3353 N
b. 6651 N
c. 6310 N
d. 3531.6 N - ✔✔d. 3531.6 N
✔✔If a force of 1 N is applied to a mass of 1 kg, then that mass will accelerate at
_________:
a. 10 m/s2
b. 1 m/s2
c. 9.81 m/s2
d. 100 m/s2 - ✔✔b. 1 m/s2
✔✔Velocity is equal to:
a. displacement / time
, b. distance / time
c. displacement × time
d. distance × time - ✔✔a. displacement / time
✔✔How long does it take a body to change velocity by 80 m/s at a rate of 5 m/s?:
a. 12 seconds
b. 16 seconds
c. 18 seconds
d. 22 seconds - ✔✔b. 16 seconds
✔✔79.Short retractable soot blowers usually penetrate the furnace waterwall
_________ through special openings:
a. 50 - 75 mm
b. 30 - 45 mm
c. 10 - 20 mm
d. 25 - 50 mm - ✔✔d. 25 - 50 mm
✔✔The inner tube on a soot blower lance __________, and conveys steam from the
poppet valve to the outer tube:
a. advances the lance tube into the boiler
b. rotates in a spiral fashion
c. remains stationary
d. forms a helical blowing pattern - ✔✔c. remains stationary
✔✔This is a pressure vessel that intercepts, cools and depressurizes boiler water in
order to protect municipal sewer systems:
a. blowby vessel
b. blowthrough vessel
c. blowoff vessel
d. blowdown separator - ✔✔c. blowoff vessel
✔✔To reduce the total solids concentration in the boiler water, this is done at all times:
a. coagulation
b. intermittent blowdown
c. chemical addition
d. continuous blowdown - ✔✔d. continuous blowdown
✔✔The water temperature at the blowoff tank outlet must not exceed _________
degrees C:
a. 75
b. 65
c. 85
d. 55 - ✔✔b. 65
