Deck 5: Casting and Foundry Technology

Question 1

Shell patterns are often used for

A)pipe work
B)bends
C)drainage fittings
D)all of the above

Answer 1

all of the above

Question 2

In carbondioxide moulding the pressure of carbondioxide is around

A)500 kg/cm²
B)1.5 kg/cm²
C)15 kg/cm²
D)150 kg/cm²

Answer 2

1.5 kg/cm²

Question 3

As compared to green sand in shell moulding cooling rate of cast metal is slow. Hence as compared to green sand castings, shell moulded castings will have

A)larger grain size
B)smaller grain size

Answer 3

larger grain size

Question 4

Which of the following cast iron is resistant to attack by sea water?

A)Low nickel cast iron
B)Low sulphur cost iron
C)Low chromium cast iron
D)Low phosphorous cast iron

Question 5

Shaving of die casted parts is the process of removal of

A)sprue
B)flash
C)runner
D)none of the above

Question 6

The lower portion of the moulding flasks are known as

A)Cheek
B)Cope
C)Drag

Question 7

Molybdenum upto 1.5% is added to cast iron to

A)improve strength
B)reduce wear resistance
C)increase machinability
D)all of the above

Question 8

A pit furnace can be used for the melting of

A)cast iron
B)brass
C)aluminium
D)all of the above

Question 9

Which of the following operations improve wear resistance and mechanical properties of castings?

A)Shot peening
B)Chilling
C)Nitriding
D)All of the above

Question 10

Metal moulds are used in all of the following EXCEPT

A)Investment casting
B)Permanent mould casting
C)Centrifugal casting
D)Die casting process

Question 11

Which of the following is used to increase refractoriness of sand?

A)Graphite
B)Silica flour
C)Iron free zirconium
D)all of the above

Question 12

Alloy containing 70% nickel and 30% copper is known as

A)hastalloy
B)permalloy
C)monel metal
D)N-c alloy

Question 13

Generally for the melting of cast iron, electric furnaces are not used because

A)cast iron is in the form of broken pieces
B)It is expensive to use electricity for melting of cast iron
C)the rate of heating required for melting cast iron connot be provided by electric furnaces
D)cast iron requires higher temperature for heating

Question 14

Which variety of cast iron can be forged?

A)Grey cast iron
B)High silicon cast iron
C)Wrought iron
D)All of the above

Question 15

The solidification shrinkage of magnesium alloys is about

A)4 percent
B)1 percent
C)0.1 percent
D)14 percent

Question 16

The drawback with metallic pattern is

A)excessive weight
B)expensive
C)difficult to shape
D)all of the above

Question 17

Which of the following is a screen?

A)Shovel
B)Slick
C)Riddle
D)Rearner

Question 18

The property of the foundry sand which enables it to adhere to the surface of other materials is termed

A)Cohesiveness
B)Adhesiveness
C)Either of (A) or (B)

Question 19

A cupola one metre in diameter and 4 metres in height will melt in one hour about

A)0.5 tonnes of iron
B)10 tonnes of iron
C)5 tonnes of iron
D)2 tonnes of iron

Question 20

Pure iron melts at 1500°C. Presence of carbon

A)does not change the melting point
B)reduces the melting point
C)increases the melting point

Question 21

For producing several similar parts from a single mould the moulding used is

A)bench moulding
B)floor moulding
C)plate moulding
D)none of the above

Question 22

A blind riser can be located

A)in cheek only
B)in either cope or drag
C)in drag
D)in cope

Question 23

Use of flux in melting of magnesium

A)separates out impurities
B)prevents burning of magnesium alloys
C)facilitates production of sound cstings
D)all of the above

Question 24

A blast furnace operates continuously for

A)weeks together
B)days together
C)hours together
D)months together

Question 25

When external features of the castings are important, which of the following method of casting is preferred?

A)Die casting
B)Slush casting
C)Carbondioxide casting
D)Dry sand casting