Metal Casting - Manufacturing Processes - Metallurgical Engineering Previous Year Questions

1

2007 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2007

In foundry practice, the fluidity of an alloy does NOT increase with increasing

A

superheat

B

channel size

C

flow velocity

D

heat transfer coefficient

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2

2007 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2007

An induction furnace with a holding capacity of 20 tons is used for melting 5 tons of white iron charge. The maximum available power is 5 MW. The energy required to melt 1-ton of charge is 530 kWh. Assuming no heat loss, the maximum melting rate in tons/hour is approximately

A

18.4

B

15.8

C

9.4

D

1.8

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3

2008 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2008

Riser is NOT required for the castings of

A

grey cast iron

B

white cast iron

C

Al-4% Cu

D

Al-12% Si

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4

2008 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2008

The casting processes that require expendable moulds are
(P) investment casting
(Q) low-pressure casting
(R) shell moulding
(S) slush casting

A

P, Q

B

Q, R

C

R, S

D

P, R

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5

2008 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2008

If the solidification time is 50 s, the latent heat of fusion in kJ mol^-1 is

A

300

B

352

C

472

D

532

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6

2008 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2008

In a spiral channel of 10 mm diameter and with an entrance flow velocity of 300 mm s^-1, the fluidity of the melt in mm is

A

75

B

175

C

275

D

375

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7

2009 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2009

In a sound casting, the last liquid to solidify is in the

A

runner

B

riser

C

gate

D

vent

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8

2009 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2009

From the list given below, two factors that promote coring in cast alloys are
P. slow cooling during solidification
Q. rapid cooling during solidification
R. small difference between the liquidus and the solidus temperatures
S. large difference between the liquidus and the solidus temperatures

A

P, R

B

Q, R

C

P, S

D

Q, S

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9

2010 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2010

During metal casting of a slab, the thickness of solid formed after time t is proportional to

A

t^{1/3}

B

t^{1/2}

C

t

D

t^2

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10

2010 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2010

Which of the following is a suitable method to remove hydrogen from molten aluminium?

A

Expose flowing melt to vacuum

B

Bubble humidified argon gas through the melt

C

Increase melt temperature

D

Cover melt surface with a flux

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11

2010 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2010

Match the requirement from Group I with the suitable casting process from Group II.

A

P-2, Q-3, R-4, S-1

B

P-4, Q-2, R-4, S-1

C

P-4, Q-3, R-1, S-4

D

P-2, Q-1, R-3, S-4

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12

2011 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2011

Which one of the following expands upon solidification?

A

Low carbon steel

B

High carbon steel

C

White cast iron

D

Gray cast iron

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13

2011 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2011

Assertion ‘a’ : During casting of aluminium, grain refinement can be achieved by addition of certain alloying elements.
Reason ‘r’ : The addition of the alloying element may result in the formation of deoxidation products or intermetallic compounds which may act as nucleation sites for grain refinement.

A

Both ‘a’ and ‘r’ are true but ‘r’ is not the reason for ‘a’

B

Both ‘a’ and ‘r’ are true and ‘r’ is the reason for ‘a’

C

‘a’ is true but ‘r’ is false

D

‘a’ is false but ‘r’ is true

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14

2012 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2012

The riser is designed such that the melt in the riser solidifies

A

Before casting solidifies

B

At the same time as casting solidifies

C

After casting solidifies

D

Irrespective of the solidification of the casting

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15

2012 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2012

Match the processes in Group I with the objectives in Group II

A

P-3, Q-4, R-2, S-1

B

P-4, Q-3, R-1, S-2

C

P-3, Q-2, R-1, S-4

D

P-2, Q-4, R-3, S-1

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16

2012 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2012

Match the defects listed in Group I with the processes listed in Group II

A

P-2, Q-4, R-1, S-4

B

P-2, Q-4, R-3, S-1

C

P-2, Q-3, R-1, S-4

D

P-4, Q-1, R-2, S-3

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17

2013 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2013

Risers are NOT required for casting

A

stainless steel

B

plain carbon steel

C

grey cast iron

D

white cast iron

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18

2014 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2014

In a sand casting of a rectangular slab, the thickness of the solidified layer after 2 minutes is known to be 3 cm. Based on Chvorinov's rule, the solidified thickness (in cm) after 4 minutes is ______

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19

2016 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2016

The operation NOT associated with casting is

A

Gating

B

Fettling

C

Stack Moulding

D

Calendaring

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20

2016 · Metallurgical Engineering · Manufacturing Processes · Metal Casting

Metallurgical Engineering (MT) 2016

For casting a cylindrical aluminum bloom having a length of 1000 mm and diameter of 750 mm, the approximate solidification time (in minutes) estimated using Chvorinov’s rule is
[The mould constant is 2 s.mm^-2]

A

45

B

316

C

440

D

620

Check answer

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