Casting Level - 2 - GATE ME Manufacturing Engineering Free MCQ Test

Wood flour is added to core sand to improve:

Which of the following sand ramming methods result into hardest layer at parting plane and around the pattern and less dense in top layers?

Recess provided in the material for locating and positioning of cores is called as:

Match the following according to the properties of moulding sand

List-I

a. Cohesiveness

b. Adhesiveness

c. Refractoriness

d. Collapsibility

List-II

i. Ability of breaking the mould with little force

ii. Ability to withstand higher temperature without losing strength

iii. Ability of bond formation of sand particles with other materials

iv. Ability to form bond between sand particles

Match the four basic elements of moulding sand with its percentage

Which one is true for strainer:

The shape factor for a casting in the form of an annular cylinder of outside diameter 30 cm, inside diameter 20 cm and height 30 cm (correction factor, k = 1 ) will be:

Match List-I (Type of casting) with List-II (Working principles) and select the correct answer using the codes given below the lists:

List-I

a. Die casting

b. Centrifugal casting

c. Centrifuging

d. Continuous casting

List-II

1. Molten metal is forced into the die under pressure

2. Axis of rotation does not coincide with axis of mould

3. Metal solidifies when mould is rotating

4. Continuously pouring molten metal into mould

The correct reasons for the occurrence of hot tear in casting among the following reasons will be:

i. Hindered contraction occurring immediately after metal has solidified

ii. Poor collapsibility of mould and core

iii. Too high pouring temperature

Directional solidification means:

A steel slab casting of dimensions 30 cm x 30 cm x 6 cm with a side riser is to be casted horizontally into the mould. Using modulus method, the volume of the cylindrical riser is __________cm³

The rate of formation of thickness (in mm) of the metal skin frozen during solidification of pure zinc casting is found to be 2 times of square root of solidification time (in s). What will be the solidification time if thickness of the solid zinc casting is 16 mm?

In a gating design, sprue has an area 5.4cm² , where the pouring basin meets the sprue, sprue length is 30 cm and desired molten metal flow rate is 900 cm³ /s. The area of the sprue at the bottom to avoid air aspiration effect is:

A cylindrical side riser is used for a sand casting mold. The casting itself is a rectangular plate with dimensions 7.5 x 12.5 x 2 cm³ . The solidification time for this casting is 1.6 min. The cylinder for the riser has a diameter to height ratio equal to 1. If the riser and casting are in same mold, then for a riser solidification time of 2 min, its dimension is __________ cm

The following data is observed for a casting process:

Mass of casting = 5000 kg

Density of metal = 8000 kg/m³

Pouring time = 10 sec

Efficiency factor = 0.9

Effective had = 2 m

The chock area of the casting is ___________mm²

A cast steel slab of dimension 30 x 20 x 5 cm³ is poured horizontally using a side riser. The riser is cylindrical in shape with diameter and height both equal to 12 cm. The freezing ratio of mould for Caine’s empirical equation is:

What is the modulus of a optimum side riser in the shape of square parallelopiped with side a:

Following are the steps followed in a typical casting process:

i. Moulding

ii. Pattern making

iii. Melting and pouring

iv. Core making

v. Testing and inspection

vi. Fettling

The correct sequence of steps will:

In risering analysis, for finding the riser contribution, chills are used to:

Which of the following statements are true with regard to the hot chamber and cold chamber die cast machine?

i. Hot chamber die casting machine has a furnace for melting and holding the metal

ii. High melting temperature alloys of nonferrous type are best to die cast in hot chamber machines

iii. In cold chamber machine, metal is ladled by hand from a nearly holding furnace