Home
Current Affairs January 2024

What is the correct answer?

4

In natural circulation type boiler,

A. Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C. Feed pump is employed to supplement natural circulation in water wall type furnace

D. Water is converted into steam in one. Pass without any recirculation

Correct Answer :

A. Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum


Related Questions

What is the correct answer?

4

Hard coke is produced by carburisation of coal at

A. Atmospheric temperature

B. 500-600°C

C. 700-850°C

D. 950-1100°C

What is the correct answer?

4

In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine

A. Lancashire boiler

B. Locomotive boiler

C. Babcock and Wilcox boiler

D. Benson boiler

What is the correct answer?

4

In locomotives, the draught is produced by

A. Chimney

B. Induced draft fan

C. Both combined (A) and (B)

D. Steam jet draught

What is the correct answer?

4

The efficiency of an impulse turbine is maximum when (where Vb = Blade speed, V = Absolute velocity of steam entering the blade, and α = Nozzle angle)

A. Vb = 0.5 V cosα

B. Vb = V cosα

C. Vb = 0.5 V² cosα

D. Vb = V² cosα

What is the correct answer?

4

The fire tubes in a Scotch marine boiler are

A. Horizontal

B. Vertical

C. Inclined

D. None of these

What is the correct answer?

4

Parson's turbine is a

A. Simple impulse turbine

B. Simple reaction turbine

C. Impulse-reaction turbine

D. None of these

What is the correct answer?

4

The pressure compounded impulse turbine as compared to velocity compounded turbine require __________ number of stages.

A. Same

B. Less

C. More

D. None of these

What is the correct answer?

4

Size of boiler tubes is specified by

A. Mean diameter and thickness

B. Inside diameter and thickness

C. Outside diameter and thickness

D. Outside diameter and inside diameter

What is the correct answer?

4

Which is not correct statement about pulverised fuel firing?

A. High burning rate is possible

B. Heat release can be easily controlled

C. Fuel burns economically

D. It is the best technique for burning high ash content fuel having low fusion ash

What is the correct answer?

4

The safety valve at superheater as compared to drum safety valve setting is set at

A. Higher value

B. Lower value

C. Same value

D. Any value

What is the correct answer?

4

The Locomotive boiler has

A. 137 fire tubes and 44 superheated tubes

B. 147 fire tubes and 34 superheated tubes

C. 157 fire tubes and 24 superheated tubes

D. 167 fire tubes and 14 superheated tubes

What is the correct answer?

4

Boiler parameters are expressed by

A. Tonnes/hr. of steam

B. Pressure of steam in kg/cm²

C. Temperature of steam in °C

D. All of the above

What is the correct answer?

4

For the same diameter and thickness of tube, a water tube boiler has ________ heating surface as compared to fire tube boiler.

A. More

B. Less

C. Equal

D. None of these

What is the correct answer?

4

Gradually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of

A. Higher effectiveness of boiler

B. High calorific value coal being burnt

C. Fouling of heat transfer surfaces

D. Raising of steam temperature

What is the correct answer?

4

A device used to put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit, is called

A. Blow off cock

B. Stop valve

C. Superheater

D. None of these

What is the correct answer?

4

The ratio of the volume at cut-off to the swept volume is called

A. Cut-off ratio

B. Expansion ratio

C. Clearance ratio

D. None of these

What is the correct answer?

4

The change in internal energy in steam engines equals to

A. Work done during the Rankine cycle

B. Work done during compression

C. Work done during adiabatic expansion

D. Change in enthalpy

What is the correct answer?

4

The fire tubes in a Locomotive boiler has _________ diameter.

A. 4.75 mm

B. 5.47 mm

C. 7.45 mm

D. 47.5 mm

What is the correct answer?

4

The Parsons' reaction turbine has

A. Only moving blades

B. Only fixed blades

C. Identical fixed and moving blades

D. Fixed and moving blades of different shape

What is the correct answer?

4

For maximum discharge through a chimney, the condition is that height of hot gas column producing the draught should be

A. One-half the height of chimney

B. Equal to the height of chimney

C. Two times the height of chimney

D. Four times the height of chimney

What is the correct answer?

4

The flow through a nozzle is regarded as

A. Constant volume flow

B. Constant pressure flow

C. Isothermal flow

D. Isentropic flow

What is the correct answer?

4

The biggest size of thermal power unit operating in India is

A. 30 MW

B. 60 MW

C. 100 MW

D. 500 MW

What is the correct answer?

4

A wet vapour can be completely specified by

A. Pressure only

B. Temperature only

C. Dryness fraction only

D. Pressure and dryness fraction

What is the correct answer?

4

The efficiency of steam turbines may be improved by

A. Reheating of steam

B. Regenerative feed heating

C. Binary vapour plant

D. Any one of these

What is the correct answer?

4

With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

What is the correct answer?

4

Which of the following substance will have same percentage in both proximate and ultimate analysis?

A. Ash

B. Volatile matter

C. Moisture

D. Hydrogen

What is the correct answer?

4

Desecration of feed water is carried out because it reduces

A. Cavitation of boiler feed pumps

B. Corrosion caused by oxygen

C. Heat transfer coefficient

D. pH value of water

What is the correct answer?

4

When the cross-section of a nozzle __________ continuously from entrance to exit, it is called a convergent nozzle.

A. Increases

B. Decreases

C. Remain same

D. None of these

What is the correct answer?

4

Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

A. Boil

B. Flash i.e. get converted into steam

C. Remain as it was

D. Cool down

What is the correct answer?

4

The length of Cornish boiler varies from

A. 2 to 4.5 m

B. 3 to 5 m

C. 5 to 7.5 m

D. 7 to 9 m