Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?

A

13 : 42

B

19 : 43

C

15 : 42

D

17 : 43

If 2 kg of metal, of which 1/3 is zine and the rest is copper , be mixed with 3 kg of metal, of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?

A

17 : 43

B

13 : 42

C

19 : 43

D

15 : 42

10 cm লম্বা ও 0.5 cm ব্যাসার্ধ বিশিষ্ট একটি তামা ও একটি লোহার তারকে জোড়া লাগিয়ে দৈর্ঘ্য 20 cm করা হল। জোড়া লাগানো তারটিকে বল প্রয়োগ করে লম্বা করা হল। লোহার ইয়ংয়ের গুণাঙ্ক তামার ইয়ংয়ের গুণাঙ্কের দুইগুণ হলে লোহার দৈর্ঘ্য বৃদ্ধি ও তামার দৈর্ঘ্য বৃদ্ধির অনুপাত কত? ( A steel and a brass wire, both having 10 cm length and 0.5 cm radius, are joined together making the total length of the combined wire 20 cm. The combined wire is stretched by applying a force. If the Young's modulus of steel is twice as much as that of brass, what will be the ratio of the extension of steel to the extension of brass?)

A

1 :8

B

1 : 6

C

1 : 4

D

1 : 2

10 cm লম্বা ও 0.5 cm ব্যাসার্ধ বিশিষ্ট একটি তামা ও একটি লোহার তারকে জোড়া লাগিয়ে দৈর্ঘ্য 20 cm করা হল। জোড়া লাগানো তারটিকে বল প্রয়োগ করে লম্বা করা হল। লোহার ইয়ংকের গুণাস্ক তামার ইয়ংকের গুণাস্কের দুইগুন হলে লোহার দৈর্ঘ্য বৃধি ও তামার দৈর্ঘ্য বৃদ্ধির অনুপাত কত? (A steel and a brass wire, both having 10 cm length and 0.5 cm radius, are joined together making the total length of the combined wire 20 cm. The combined wire is stretched by applying a force. If the Young‘s modulus of steel is twice as much as that of brass, what will be the ratio of the extension of steel to the extension of brass?)

A

1:8

B

1:6

C

1:4

D

1:2

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

A

High co-efficient of thermal expansion

B

Low thermal conductivity

C

High corrosion resistance

D

All of the above

In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

A

Jet of water at high pressure

B

Blast of air

C

Mixture of water and air

D

Rain of molten lead

Brass (alloy of copper and zinc) is an example of

A

Substitutional solid solution

B

Interstitial solid solution

C

Intermetallic compounds

D

All of the above

Admiralty gun metal contains

A

63 to 67% nickel and 30% copper

B

88% copper, 10% tin and rest zinc

C

Alloy of tin, lead and cadmium

D

Iron scrap and zinc

If partial pressure of air and steam be ‘pa’ and ‘ps’ respectively in a condenser, then according to Dalton's law, the pressure in condenser is equal to

A

ps - pa

B

pa - ps

C

pa + ps

D

None of these

The thermal efficiency of the engine with condenser as compared to without condenser, for a given pressure and temperature of steam, is

A

Higher

B

Lower

C

Same as long as initial pressure and temperature is unchanged

D

None of the above

Admiralty brass used for steam condenser tubes contains copper and zinc in the following ratio

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