A. reduce cost
B. improve surface finish
C. prevent clogging
D. reduce wear and eliminate scuffing
E. improve heat transfer
Related Mcqs:
- The top piston ring nearer to the piston crown is known as_____________________?
A. compression ring
B. oil ring
C. scrapper ring
D. groove ring
E. leading ring - Piston rings are usually made of___________________?
A. cast iron
B. aluminium
C. phosphor bronze
D. babbitt
E. carbon steel - Leakage past the piston rings and valve seats in I.C. engines with increase in speed_______________?
A. increases.
B. decreases
C. remains same
D. unpredictable
E. none of the above - In loop scavenging, the top of the piston is________________?
A. flat
B. contoured
C. slanted
D. depressed
E. convex shaped - In the opposed piston diesel engine, the combustion chamber is located________________?
A. above the piston (/;) below the piston
C. between the pistons
D. any when
E. there is no such criterion - Chromium in steel_________________?
A. improves wear resistance, cutting ability and toughness
B. refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
C. improves cutting ability and reduces hardenability
D. gives ductility, toughness, tensile strength and anticorrosion properties
E. makes steel hard - Pick up the wrong statement Nickel and chromium in steel help in _________________?
A. providing corrosion resistance
B. improving machining properties
C. providing high strength at elevated temperatures
D. raising the elastic limit
E. improving the resilience and ductility - The function of a distributor in an automobile is to__________________?
A. distribute charge, equally to all the cylinders
B. regulate power
C. feed lub oil to all moving parts
D. time the spark
E. inject fuel at appropriate time - Points of arrest for iron correspond to__________________?
A. stages at which allotropic forms change
B. stages at which further heating does not increase temperature for some time
C. stages at which properties do not change with increase in temperature
D. there is nothing like points of arrest
E. none of the above - Feed water conditioning in thermal power plants in done to__________________?
A. reduce hardness and for removal of solids
B. increase efficiency-of thermal power plant
C. increase *heat transfer rate
D. increase steam parameters
E. all of the above
