Engineering Chemistry Multiple Choice Questions on “Lubricants”.
1. Lubrication is necessary to protect wear and tear caused due to _______________
a) Electrostatic force
b) Gravitational force
c) Frictional force
d) Magnetic force
Answer: c
Clarification: Lubrication is necessary to protect wear and tear caused due to frictional force. Electrostatic, gravitational and magnetic forces do not cause wear and tear.
2. Lubricant act as a coolant to carry away heat.
a) True
b) False
Answer: a
Clarification: Lubricant act as a coolant to carry away heat and is generally used in refrigerators and air conditioners.
3. Select the incorrect statement from the following option.
a) Lubricant keeps out dirt
b) Lubricant act as a seal
c) Lubricant transmit fluid power
d) Lubricant enhance corrosion
Answer: d
Clarification: Lubricants prevents corrosion. It does not act as a seal or remove dirt and also not transmit fluid power.
4. The viscosity of petroleum oil for hydraulic lifts is ____________
a) High
b) Low
c) Moderate
d) Very high
Answer: b
Clarification: The viscosity of petroleum oil for hydraulic lifts is low as it makes it less dense and easier to lift up while carrying the operation.
5. The science of friction, lubrication and wear is called ____________
a) Endiology
b) Geology
c) Tribology
d) Morphology
Answer: c
Clarification: The science of friction, lubrication and wear is called tribology. Morphology and Geology relates to the science of Earth’s crust and rock structure.
6. On increasing the lubrication, the efficiency of the machine ____________
a) Increases
b) Decreases
c) Remain same
d) Does not get affected
Answer: a
Clarification: On increasing the lubrication, the efficiency of the machine increases as it increases the speed of the operations and causes less wear and tear.
7. The stearate ion has a ________ carbons long hydrocarbon chain.
a) 17
b) 19
c) 21
d) 23
Answer: a
Clarification: The stearate ion has a 17 carbons long hydrocarbon chain, which is hydrophobic in nature.