The temperature of the inner luminous cone of neutral flame is about

In Oxyacetylene gas welding, temperature at the inner cone of the flame is around

A

3500°C

B

3200°C

C

2900°C

D

2550°C

During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

A

Incomplete combustion

B

Complete combustion

C

High oxygen in flue gas

D

None of these

A sooty flame can be made non-luminous by

A

Admitting more gas

B

Shutting gas supply

C

Admitting more air

D

Shutting air supply

Actual flame temperature is always lower than the adiabatic flame temperature, because there is

A

No possibility of obtaining complete combustion at high temperature

B

Always loss of heat from the flame

C

Both A & B

D

Neither A nor B

The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.

A

Lower than

B

Higher than

C

Same as

D

Not related to

The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.

A

Lower than

B

Higher than

C

Same as

D

Not related to

If the depth of actual neutral axis in a beam is more than the depth of critical neutral axis, then the beam is called

A

Balanced beam

B

Under reinforced beam

C

Over reinforced beam

D

None of the above

In a D.C. generator the magnetic neutral axis coincides with the geometrical neutral axis, when

A

There is no load on the generator

B

The generator runs on full load

C

The generator runs on overload

D

The generator runs on designed speed

In case of an under-reinforced beam, the depth of actual neutral axis is __________ that of the critical neutral axis.

A

Same as

B

Less than

C

Greater than

D

None of these

A neutral flame is obtained by supplying

A

Equal volumes of oxygen and acetylene

B

More volume of oxygen and less volume of acetylene

C

More volume of acetylene and less volume of oxygen

D

None of the above

The temperature of the inner luminous cone of neutral flame is about

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