Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?

The Sea water is more salty than rain water because

A

Sea creatures salt

B

Air around sea is salty

C

Rivers pours salt from the soil into sea

D

There are salt mines in sea surface

A condenser where circulating water flows through tubes which are surrounded by steam, in known as

A

Surface condenser

B

Jet condenser

C

Barometric condenser

D

Evaporative condenser

________ cooling is the process of dissipating the armature and field winding losses to a cooling medium circulating within the winding insulation wall

A

Direct

B

Indirect

C

Conventional

D

Any of the above

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

For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.

A

Half

B

Twice

C

Thrice

D

Five times

Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

A

Hydrostatic head is required for refluxing the condensate

B

Only the function of condensation is to be carried out

C

Sub cooling of condensate is desired

D

Both the functions of condensation & sub cooling are carried out in a single unit

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

Heat transfer co-efficient for a horizontal condenser as compared to a vertical condenser operating under similar conditions is

A

Same

B

Less

C

About 3 times

D

About 0.33 times

The most salty basin in the world is the

A

Caspian Sea

B

Dead Sea

C

Red Sea

D

Arabian Sea

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

A

50 : 50

B

30 : 70

C

70 : 30

D

40 : 60

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?

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