machine design 1 elements1

Question 1

Which of the following material has the maximum ductility?

Answer 1

Mild steel

Question 2

According to Indian standard specifications, a grey cast iron designated by ‘FG 200’ means that the

Answer 2

minimum tensile strength is 200 N/mm2

Question 3

Steel containing up to 0.15% carbon is known as

Answer 3

dead mild steel

Question 4

According to Indian standard specifications, a plain carbon steel designated by 40C8 means that

Answer 4

carbon content is 0.35 to 0.45 per cent and manganese is 0.60 to 0.90 per cent

Question 5

The material commonly used for machine tool bodies is

Answer 5

cast iron

Question 6

The material commonly used for crane hooks is

Answer 6

wrought iron

Question 7

Shock resistance of steel is increased by adding

Answer 7

nickel and chromium

Question 8

The steel widely used for motor car crankshafts is

Answer 8

chrome steel

Question 9

A steel with 0.8 per cent carbon is known as

Answer 9

eutectoid steel

Question 10

18/8 steel contains

Answer 10

18 per cent chromium and 8 per cent nickel

Question 11

Ball bearing are usually made from

Answer 11

medium carbon steel

Question 12

The process which improves the machinability of steels, but lower the hardness and tensile strength is

Answer 12

spheroidising

Question 13

The metal suitable for bearings subjected to heavy loads is

Answer 13

white metal

Question 14

The metal suitable for bearings subjected to light loads is

Answer 14

phosphor bronze

Question 15

Thermoplastic materials are those materials which

Answer 15

Do not become hard with the application of heat and pressure and no chemical change occurs