Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of

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

Substances which have permeability less than the permeability of free space are known as

A

Ferromagnetic

B

Paramagnetic

C

Diamagnetic

D

Bipolar

Studies of fatal automobile accidents reveal that , in the majority of cases in which one occupant of an automobile is killed another survives, it is the passenger , not the driver , who is killed. It is ironic that the innocent passenger should suffer for the driver's carelessness, while the driver often suffers only minor injuries or none at all. Which of the following is an assumption underlying the reasoning in the passage above?

A

In most fatal automobile accidents , the driver of a car in which an occupant is killed is at fault .

B

Most deaths in fatal automobile accidents are suffered by occupants of cars rather then by pedestrians .

C

Auto safety experts should increase their efforts to provide protection for those in the passenger seats of automobiles

D

Automobile passengers sometimes play a contributing role in causing auto accidents

The diameters of fire tubes and superheater tubes in locomotive boiler are

A

47.5 mm, 130 mm

B

32.5 mm, 180 mm

C

65.5 mm, 210 mm

D

24.5 mm, 65 mm

In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

A

Are easier to clean

B

Are less prone to fouling

C

Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less

D

None of these

The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.

A

Refrigerant cooling

B

Evaporator

C

Condenser

D

Throttling

Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is

A

Alumina

B

Platinum

C

Vanadium pentoxide

D

Iron oxide

Tyres are made by

A

Injection moulding

B

Extrusion

C

Rotational moulding

D

Compression moulding

Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in

A

Coagulation and flocculation of colloids

B

Oxidation of carbonaceous matter to CO₂

C

Nitrification or oxidation of ammonia derived from breakdown of nitrogeneous organic matter to the nitrite and eventually to the nitrate

D

All of the above

The basic purpose of tyres is to

A

Grip the road and provide good traction

B

Substitute for springs

C

Act as brake

D

None of these

Due to its excellent permeability to air/gas and oxidation resistance, the tubes of automobile tyres is made of

Related Questions