5th Class Power Engineering
10. What is the volume of a cylinder with a diameter of 9 cm and a height of 15 cm?
a)106.0cm3
b)3817.0cm3
c)238.6cm3
d) 954.3cm3
e)1590.4 cm3 - ANS - d
52. The first indicator of a products hazard is the:
a) MSDS
b) workplace label
c) colour of the container
d) supplier label
e) supplier identifier - ANS - d
A 'tinning temperature' is used in:
a) soldering
b) braze welding
c) forging
d) electric arc welding
e) metal cutting - ANS - b
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 moved?
a)501.6 kg
b)51.1 kg
c)5113.1 kg
d)250 kg
e)25.6 kg - ANS - b
A Class 'A' product would be:
a) a liquid with a flash point of less then 37.8 degrees C
b) a solid that ignites readily and burns with a self-sustaining flame
c) a product that is normally a gas below 50 degrees C
d) any dangerous goods Classed as 4.1 under IDG Regulations
,e) dibenzoyl peroxide - ANS - c
A controlled product of LD50 of 10 mg/kg when compared to an LD50 of 60 mg/kg is:
a) more lethal
b) more flammable
c) less lethal
d) less flammable
e) less reactive - ANS - a
A device that usually uses air or steam to do its job is the:
a) syphon
b) operating control
c) burner
d) sootblower
e) try cock - ANS - d
A device used on smaller heating boilers to measure water 'head' or height is the:
a) gage glass
b) header
c) pressure gage
d) syphon
e) altitude gage - ANS - e
A disadvantage of a ball float steam trap is that it:
a) does not handle air well
b) is greatly effected by changes in steam pressure
c) only operates well under high condensate loads
d) is vulnerable to damage from water hammer
e) must be bypassed on start up - ANS - d
A disc-type steam trap employs which of the following to control its operations?
a) water level
b) temperature difference
c) heat energy in the steam
d) buoyancy of the disc
e) volatile material in the disc - ANS - c
A massless bar is 4.6 m long with a pivot (fulcrum) 1.6 m from the right end. A 41 kg
mass is placed at the left end, 3.0 m from the fulcrum. Calculate the force (in Newtons)
that must be placed at the right end (1.6 m from the fulcrum) so that system is balanced.
, a)754.14 N
b)76.88 N
c)27.50 N
d)123 N
e)1206.63 N - ANS - a
A pressure vessel is in the form of a cylinder with each end in the form of a hemisphere.
The vessel operates at 1100 kPa. If the overall length is 12 m and the diameter is 3 m,
what is the volume of the pressure vessel?
a)77.79 m3
b)113.1 m3
c)91.9 m3
d)94.2 m3
e)84.8 m3 - ANS - d
A rectifier used in arc welding:
a) will produce temperatures in the range of 700 to 830 degrees C
b) will change AC to DC
c) is used for weld inspection
d) will rectify slag inclusion problems
e) produces an arc in the temperature range of 8300 to 13000 degrees C - ANS - b
A steam pipe 450 m long is installed at an ambient temperature of 20°C. When in
service, the pipe will carry steam at 520°C. If the coefficient of linear expansion of steel
is 12.10x10^-6 / °C, how much will the line increase in length when put into service?
Please note that 12.10x10^-6 / °C is often (which is in error) written as 12.106 / °C.
a) 0.9 m
b) 1.008 m
c) 2.7 m
d) 2.91 m
e) 3.25 m - ANS - c
A valve having minimum wire drawing and seat erosion is the:
a) globe valve
b) gate valve
c) plug valve
d) hand valve
e) wedge gate valve - ANS - a
A workplace label:
10. What is the volume of a cylinder with a diameter of 9 cm and a height of 15 cm?
a)106.0cm3
b)3817.0cm3
c)238.6cm3
d) 954.3cm3
e)1590.4 cm3 - ANS - d
52. The first indicator of a products hazard is the:
a) MSDS
b) workplace label
c) colour of the container
d) supplier label
e) supplier identifier - ANS - d
A 'tinning temperature' is used in:
a) soldering
b) braze welding
c) forging
d) electric arc welding
e) metal cutting - ANS - b
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 moved?
a)501.6 kg
b)51.1 kg
c)5113.1 kg
d)250 kg
e)25.6 kg - ANS - b
A Class 'A' product would be:
a) a liquid with a flash point of less then 37.8 degrees C
b) a solid that ignites readily and burns with a self-sustaining flame
c) a product that is normally a gas below 50 degrees C
d) any dangerous goods Classed as 4.1 under IDG Regulations
,e) dibenzoyl peroxide - ANS - c
A controlled product of LD50 of 10 mg/kg when compared to an LD50 of 60 mg/kg is:
a) more lethal
b) more flammable
c) less lethal
d) less flammable
e) less reactive - ANS - a
A device that usually uses air or steam to do its job is the:
a) syphon
b) operating control
c) burner
d) sootblower
e) try cock - ANS - d
A device used on smaller heating boilers to measure water 'head' or height is the:
a) gage glass
b) header
c) pressure gage
d) syphon
e) altitude gage - ANS - e
A disadvantage of a ball float steam trap is that it:
a) does not handle air well
b) is greatly effected by changes in steam pressure
c) only operates well under high condensate loads
d) is vulnerable to damage from water hammer
e) must be bypassed on start up - ANS - d
A disc-type steam trap employs which of the following to control its operations?
a) water level
b) temperature difference
c) heat energy in the steam
d) buoyancy of the disc
e) volatile material in the disc - ANS - c
A massless bar is 4.6 m long with a pivot (fulcrum) 1.6 m from the right end. A 41 kg
mass is placed at the left end, 3.0 m from the fulcrum. Calculate the force (in Newtons)
that must be placed at the right end (1.6 m from the fulcrum) so that system is balanced.
, a)754.14 N
b)76.88 N
c)27.50 N
d)123 N
e)1206.63 N - ANS - a
A pressure vessel is in the form of a cylinder with each end in the form of a hemisphere.
The vessel operates at 1100 kPa. If the overall length is 12 m and the diameter is 3 m,
what is the volume of the pressure vessel?
a)77.79 m3
b)113.1 m3
c)91.9 m3
d)94.2 m3
e)84.8 m3 - ANS - d
A rectifier used in arc welding:
a) will produce temperatures in the range of 700 to 830 degrees C
b) will change AC to DC
c) is used for weld inspection
d) will rectify slag inclusion problems
e) produces an arc in the temperature range of 8300 to 13000 degrees C - ANS - b
A steam pipe 450 m long is installed at an ambient temperature of 20°C. When in
service, the pipe will carry steam at 520°C. If the coefficient of linear expansion of steel
is 12.10x10^-6 / °C, how much will the line increase in length when put into service?
Please note that 12.10x10^-6 / °C is often (which is in error) written as 12.106 / °C.
a) 0.9 m
b) 1.008 m
c) 2.7 m
d) 2.91 m
e) 3.25 m - ANS - c
A valve having minimum wire drawing and seat erosion is the:
a) globe valve
b) gate valve
c) plug valve
d) hand valve
e) wedge gate valve - ANS - a
A workplace label:
