Power Engineering - 4th Class Materials and Welding
Practice Questions With Complete Solutions
_____ are any substances that cannot be broken down into other
substances or ingredients by chemical means.
a. Elements
b. Molecules
c. Mixtures
d. Atoms
e. Compounds Correct Answers a. Elements
_____ does not contain any neutrons in its nucleus.
a. Carbon
b. Oxygen
c. Helium
d. Nitrogen
e. Hydrogen Correct Answers e. Hydrogen
_____ is a material's ability to be greatly lengthened and
reduced in cross-sectional area without breaking.
a. Stiffness
b. Elasticity
c. Plasticity
d. Ductility
e. Toughness Correct Answers d. Ductility
_____ refers to that property of a material which enables it to
resist wear, abrasion and penetration.
,a. Brittleness
b. Elasticity
c. Toughness
d. Hardness
e. Stiffness Correct Answers d. Hardness
________ metals do not have iron as their main constituent.
a. Non-ferrous
b. Alloy
c. Cast
d. Hard
e. Ferrous Correct Answers a. Non-ferrous
"Coalescence" is:
a. A term used in brazing
b. The mixing of gases in a cutting torch
c. A type of coating used on a welding rod
d. A term used in soldering
e. The fusing of molten particles to form a continuous film
Correct Answers e. The fusing of molten particles to form a
continuous film
A "reducing flame" is one which is
a. Held perpendicular to the weld axis
b. Most likely to cause backfire
c. Oxygen rich
d. Placed an increased distance from the work
,e. Rich in acetylene Correct Answers e. Rich in acetylene
A "rule of thumb" rate of continuous blowdown is
approximately
a. 15% of steaming rate
b. 3% of steaming rate
c. 1% of steaming rate
d. 5% of steaming rate
e. 10% of steaming rate Correct Answers c. 1% of steaming rate
A "tinning temperature" above 450 degrees C is used in:
a. Metal cutting
b. Soldering
c. Electric arc welding
d. Forging
e. Brazing Correct Answers e. Brazing
A bearing material composed primarily of tin and lead is called:
a. anti-friction metal
b. bearing metal
c. babbitt
d. grey metal
e. lead base Correct Answers c. babbitt
A blowdown tank will:
a. lower the temperature and pressure of the incoming boiler
water
, b. not be classed as a pressure vessel since it is vented
c. have to be cleaned monthly to remove the collected sludge
d. not have to have any specific capacity or volume
e. be allowed to accommodate only one boiler Correct Answers
a. lower the temperature and pressure of the incoming boiler
water
A boiler steam drum will:
a. Contain a steam space that will be a higher pressure than the
water space.
b. Not distribute feedwater to cold sections of the boiler.
c. Allow load increases to be accomplished more quickly.
d. Always be the highest component of a boiler
e. Have no bearing or effect on water circulation. Correct
Answers c. Allow load increases to be accomplished more
quickly.
A boiler with only an induced draft fan
a. will have a positive furnace pressure
b. cannot maintain a stable fire
c. does need an airtight furnace
d. needs a very long stack
e. will have a negative furnace pressure Correct Answers e. will
have a negative furnace pressure
A butane molecule is a straight chain hydrocarbon molecule
with the following chemical formula:
a. C3H8
Practice Questions With Complete Solutions
_____ are any substances that cannot be broken down into other
substances or ingredients by chemical means.
a. Elements
b. Molecules
c. Mixtures
d. Atoms
e. Compounds Correct Answers a. Elements
_____ does not contain any neutrons in its nucleus.
a. Carbon
b. Oxygen
c. Helium
d. Nitrogen
e. Hydrogen Correct Answers e. Hydrogen
_____ is a material's ability to be greatly lengthened and
reduced in cross-sectional area without breaking.
a. Stiffness
b. Elasticity
c. Plasticity
d. Ductility
e. Toughness Correct Answers d. Ductility
_____ refers to that property of a material which enables it to
resist wear, abrasion and penetration.
,a. Brittleness
b. Elasticity
c. Toughness
d. Hardness
e. Stiffness Correct Answers d. Hardness
________ metals do not have iron as their main constituent.
a. Non-ferrous
b. Alloy
c. Cast
d. Hard
e. Ferrous Correct Answers a. Non-ferrous
"Coalescence" is:
a. A term used in brazing
b. The mixing of gases in a cutting torch
c. A type of coating used on a welding rod
d. A term used in soldering
e. The fusing of molten particles to form a continuous film
Correct Answers e. The fusing of molten particles to form a
continuous film
A "reducing flame" is one which is
a. Held perpendicular to the weld axis
b. Most likely to cause backfire
c. Oxygen rich
d. Placed an increased distance from the work
,e. Rich in acetylene Correct Answers e. Rich in acetylene
A "rule of thumb" rate of continuous blowdown is
approximately
a. 15% of steaming rate
b. 3% of steaming rate
c. 1% of steaming rate
d. 5% of steaming rate
e. 10% of steaming rate Correct Answers c. 1% of steaming rate
A "tinning temperature" above 450 degrees C is used in:
a. Metal cutting
b. Soldering
c. Electric arc welding
d. Forging
e. Brazing Correct Answers e. Brazing
A bearing material composed primarily of tin and lead is called:
a. anti-friction metal
b. bearing metal
c. babbitt
d. grey metal
e. lead base Correct Answers c. babbitt
A blowdown tank will:
a. lower the temperature and pressure of the incoming boiler
water
, b. not be classed as a pressure vessel since it is vented
c. have to be cleaned monthly to remove the collected sludge
d. not have to have any specific capacity or volume
e. be allowed to accommodate only one boiler Correct Answers
a. lower the temperature and pressure of the incoming boiler
water
A boiler steam drum will:
a. Contain a steam space that will be a higher pressure than the
water space.
b. Not distribute feedwater to cold sections of the boiler.
c. Allow load increases to be accomplished more quickly.
d. Always be the highest component of a boiler
e. Have no bearing or effect on water circulation. Correct
Answers c. Allow load increases to be accomplished more
quickly.
A boiler with only an induced draft fan
a. will have a positive furnace pressure
b. cannot maintain a stable fire
c. does need an airtight furnace
d. needs a very long stack
e. will have a negative furnace pressure Correct Answers e. will
have a negative furnace pressure
A butane molecule is a straight chain hydrocarbon molecule
with the following chemical formula:
a. C3H8
