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2584. The main function of primary air in pulverised coal fired burner is to

Burn CO to CO₂

Dry and transport the coal

Have proper combustion by supplying it around the burner

Preheat the tertiary air used for complete combustion of CO to CO₂

✅ The correct answer is option B.

2589. ‘Solvent naphtha’ used mostly as a solvent in paints and perfumery is produced by the __________ of virgin naphtha into small boiling range cuts.

steam reforming

distillation

desulphurisation

none of these

✅ The correct answer is option B.

2594. ‘Fat coals’ are those coals which have very high

Caking capacity

Volatile matter content

Fusion point of its ash

Inherent moisture content

✅ The correct answer is option A.

2599. Which is the most undesirable component in kerosene ?

Aromatics

i-paraffins

n-paraffins

Naphthenes

✅ The correct answer is option A.

2536. Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

Between two bodies in physical contact with each other

Between two bodies not in physical contact with each other

From one part of a body to the another part of the same body

Both B & C

✅ The correct answer is option B.

2541. Thermal diffusivity of a material

Has the unit m² /sec

Is defined as K/ρ . Cp

Is the ratio of thermal conductivity to thermal capacity

All of the above

✅ The correct answer is option D.

2546. In a forward feed multiple effect evaporator unit

Viscosity of liquid is highest in first effect

Transfer from effect to effect is done by pumps

No pump is required to withdraw the product from the last effect

None of these

✅ The correct answer is option D.

2550. In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is

Infinity

Zero

Same as average heat transfer co-efficient for tube side

None of these

✅ The correct answer is option A.

2555. Fqra cold viscous feed, backward feed gives __________ than forward feed.

A higher capacity

A lower capacity

Lower economy

None of these

✅ The correct answer is option A.

2560. In a shell and tube type heat exchanger, the floating tube bundle heat arrangement is used

In low range of temperature differences

In high range of temperature differences

Because of its low cost

To prevent corrosion of the tube bundles

✅ The correct answer is option B.

Author name: Admin