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
Related Mcqs:
- Pick up the wrong statement?
A. aluminium in steel results in excessive grain growth
B. manganese in steel induces hardness
C. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility
D. tungsten in steels improves magnetic properties and hardenability
E. sulphur, phosphorous and lead im¬prove machining properties of steel - Pick up wrong statement about wrought iron ?
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It can be easily forge welded
E. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling - Pick up the wrong statement about supercharging __________________?
A. supercharging reduces knocking in diesel engines
B. there can be limited supercharging in petrol engines because of detonation
C. supercharging at high altitudes is essential
D. supercharging results in fuel economy
E. supercharging is essential in aircraft engines - Pick up the wrong statement?
A. 2-stroke engine can run in any direction
B. In 4-stroke engine, a power stroke is obtained in 4-strokes
C. thermal efficiency of 4-stroke engine is more due to positive scavenging
D. petrol engines work on otto cycle
E. petrol engines occupy more space than diesel engines for same power output - Pick up the wrong statement about critical condition of steam___________________?
A. latent heat is zero
B. liquid directly becomes steam
C. specific volume of steam and liquid is same
D. this is the maximum pressure limit
E. all properties of liquid and steam are same - Pick up the wrong statement about water tube boiler in comparison to fire tube boilers ______________________?
A. former generates steam at high pressure
B. former occupies less space for same power
C. rate of steam flow is more in former case
D. former is used for high installed capacity
E. chances of explosion are less in former case - Pick up wrong statement about desired properties of a good fuel__________________?
A. high calorific value
B. produce minimum smoke and gases
C. ease in storing
D. high ignition point
E. ecomomical - 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 - Piston rings are plated with chromium,cadmium or phosphate in order to__________________?
A. reduce cost
B. improve surface finish
C. prevent clogging
D. reduce wear and eliminate scuffing
E. improve heat transfer - Alnico, an alloy used extensively for permanent magnets contains iron, nickel, aluminium and cobalt in the following ratio _____________________?
A. 50 : 20 : 20 : 10
B. 40 : 30 : 20 : 10
C. 50 : 20 : 10 : 20
D. 30 : 20 : 30 : 20
E. 50 : 10 : 20 : 20
