If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.

Statement (I): Piston temperature profiles near full load are flattened in case of liquid cooled engines whereas for air cooled engines temperature profiles are steeper. Statement (II): The piston temperature profiles are different in nature for liquid cooled and air cooled engines because of the different values of heat capacities.

A

Both Statement I) and Statement II) are individually true and Statement II) is the correct explanation of Statement I)

B

Both Statement I) and Statement II) are individually true but Statement II) is not the correct explanation of Statement I)

C

Statement I) is true but Statement II) is false

D

Statement I) is false but Statement II) is true

A 60% spirit solution is mixed with r% spirit solution in the ratio 1 : 3 such that a s% spirit solution is obtained. When a (s/3)% spirit solution is mixed with 55% spirit solution in equal ratio, an (r/2)% spirit solution is obtained. Which of the following can be determined? (A) Value of ‘r’ (B) Value of ‘s’ (C) Volume of the 60% spirit solution mixed initially (D) If 9 liters of r% spirit solution was mixed initially, what was the volume of the s% spirit solution thus obtained?

A

Only C and D

B

Only A and B

C

Only A, C and D

D

Only A, B and D

E

Only A, B and C

In the hypothetical phase diagram, the melting point of each pure component is. 1000 K and the eutectic temperature is 800 K. The eutectic is located at the equi-atomic composition. The maximum solid solubility in α-phase is given by the mole fraction, Ne = 0.1.
The freezing range (in K) of the alloy with composition, Ne = 0.1 is
Physical Metallurgy mcq question image

A

100

B

130

C

160

D

190

A chemical solution appears green when the salt concentration is 8 grams per litre (gpl) and red when it is 10 gpl. Pure water was added to the solution of 1 litre of 15 gpl solution till it turned green. Then 125 ml of the green solution is taken out and x grams of salt is added to the green solution to make it red. Another 500 ml of the final solution was taken out and y litres of green solution is added to get a resultant solution of concentration 9.6 gpl. Assume adding salt doesn’t change its volume and find the ratio of x and y.

A

1

B

1.25

C

1.5

D

2

E

1.75

A 34.6% Pb-Sn alloy is cooled just below the eutectic temperature (183°C). What is the fraction of proeutectic α and eutectic mixture (α+β)?

A

70% and 30%

B

64% and 36%

C

36% and 64%

D

30% and 70%

What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) The temperature of the solution increases. (ii) The temperature of the solution decreases. (iii) The temperature of the solution remains the same. (iv) Salt formation takes place.

A

(i) and (iv)

B

Only (i)

C

(ii) and (iv)

D

(iii) and (iv)

What happens when a solution of an acid is mixed with a solution of a base in a test tube? (i) Temperature of the solution decreases (ii) Temperature of the solution increases (in) The temperature of the solution remains the same (iv) Salt formation takes place

A

(i) and (iv)

B

(i) and (iii)

C

(ii) only

D

(ii) and (iv)

What happens when a solution of an acid is mixed with a solution of a base in a test tube? 1. Temperature of the solution decreases 2. Temperature of the solution increases 3. Temperature of the solution remains same 4. Salt formation takes place Select the correct answer using the codes given below.

A

1 and 4

B

1 and 3

C

Only 2

D

2 and 4

E

None of the above/More than one of the above

If the solubilities of different components (in a liquid-liquid extraction system) increase with rise in temperature, then the temperature above which they dissolve completely is known as the critical solution temperature (CST or consolute temperature). If solubilities increase with decrease in temperature, then CST is the temperature below which they dissolve completely. If a binary system has no critical solution temperature, it implies that

A

The system comprises of partially mis-cible liquids

B

The system comprises of miscible liquids

C

The system comprises of an azeotrope

D

On heating, a vapor phase will appear ; while on cooling, a solid phase will appear

A liquid alloy of the eutectic composition (L) undergoes the eutectic reaction to give α and β phases of compositions a and b respectively. The ratio of the relative amounts of α and β phases is

A

$$\frac{{\left( {b - L} \right)}}{{\left( {L - a} \right)}}$$

B

$$\frac{{\left( {L - a} \right)}}{{\left( {b - L} \right)}}$$

C

$$\frac{{\left( {b - LI} \right)}}{{\left( {b - a} \right)}}$$

D

$$\frac{{\left( {L - a} \right)}}{{\left( {b - a} \right)}}$$

If a solution of eutectic composition is cooled, __________ reaching the eutectic temperature.

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