Home
Current Affairs January 2024

What is the correct answer?

4

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

Correct Answer :

C. pa + ps


Related Questions

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

Curtis turbine is a

A. Simple reaction turbine

B. Velocity compounded turbine

C. Pressure compounded turbine

D. Pressure-velocity compounded turbine

What is the correct answer?

4

In a boiler, feed water supplied per hour is 205 kg while coal fired per hour is 23 kg. The net enthalpy rise per kg of water is 145 kJ. If the calorific valve of the coal is 2050 kJ/kg, then the boiler efficiency will be

A. 56 %

B. 63 %

C. 74 %

D. 78 %

What is the correct answer?

4

The heat balance sheet for the boiler shows the

A. Complete account of heat supplied by 1 kg of dry fuel and the heat consumed

B. Moisture present in the fuel

C. Steam formed by combustion of hydrogen per kg of fuel

D. All of the above

What is the correct answer?

4

In a single acting steam engine

A. The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

B. The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

C. The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft

D. The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft

What is the correct answer?

4

The function of a valve rod is

A. To provide reciprocating motion to the slide valve

B. To convert reciprocating motion of the piston into rotary motion of the crank

C. To convert rotary motion of the crankshaft into to and fro motion of the valve rod

D. To provide simple harmonic motion to the D-slide valve

What is the correct answer?

4

For the same length of stroke and speed of crankshaft, the piston speed for a double acting steam engine is _________ the piston speed of single acting steam engine.

A. Equal to

B. Twice

C. Three times

D. Four times

What is the correct answer?

4

During polytropic process

A. Heat transfer takes place across cylinder walls

B. Work is done

C. Steam may be wet, dry or superheated after expansion

D. All of the above

What is the correct answer?

4

Sulphur content of fuels is very important to the plant operators because it

A. Has high heating value

B. Retards electric precipitation

C. Promotes complete combustion

D. Has highly corrosive effect

What is the correct answer?

4

The function of a safety valve is

A. To blow off steam when the pressure of steam inside the boiler exceeds the working pressure

B. To indicate the water level inside the boiler to an observer

C. To measure pressure of steam inside the steam boiler

D. None of the above

What is the correct answer?

4

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

What is the correct answer?

4

The behaviour of coal in a furnace is determined by

A. The content of sulphur

B. The content of ash and heating value

C. The proximate analysis

D. The exact analysis

What is the correct answer?

4

The shell diameter and length of locomotive boiler are

A. 1.5 m, 4 m

B. 1.5 m, 6 m

C. 1 m, 4 m

D. 2 m, 4 m

What is the correct answer?

4

All steam engines work on

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. None of these

What is the correct answer?

4

The ratio of heat equivalent to brake power to the energy supplied in steam is known as

A. Mechanical efficiency

B. Overall efficiency

C. Indicated thermal efficiency

D. Brake thermal efficiency

What is the correct answer?

4

In forced recirculation 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

What is the correct answer?

4

The rate of steam produced in Benson boiler is

A. 100 tonnes/h

B. 135 tonnes/h

C. 175 tonnes/h

D. 250 tonnes/h

What is the correct answer?

4

Clearance ratio is the ratio of

A. Clearance volume to the swept volume

B. Clearance volume to the volume at cut-off

C. Volume at cut-off to the swept volume

D. Swept volume to the clearance volume

What is the correct answer?

4

In a nozzle, whole frictional loss is assumed to occur between

A. Inlet and throat

B. Inlet and outlet

C. Throat and exit

D. All of these

What is the correct answer?

4

The variation of steam pressure in the nozzle depends upon

A. Velocity of steam

B. Specific volume of steam

C. Dryness fraction of steam

D. All of these

What is the correct answer?

4

For combustion of a fuel, following is essential

A. Correct fuel air ratio

B. Proper ignition temperature

C. O₂ to support combustion

D. All the three above

What is the correct answer?

4

The economiser is used in boilers to

A. Increase thermal efficiency of boiler

B. Economise on fuel

C. Extract heat from the exhaust flue gases

D. Increase flue gas temperature

What is the correct answer?

4

Which of the following statement is wrong?

A. Locomotive boiler is a water tube boiler

B. Water tube boilers are internally fired

C. Lamont boiler is a low pressure water tube boiler

D. All of the above

What is the correct answer?

4

The difference between Cornish boiler and Lancashire boiler is that

A. Former is fire tube type and latter is water tube type boiler

B. Former is water tube type and latter is fire tube type

C. Former contains one fire tube and latter contains two fire tubes

D. None/of the above

What is the correct answer?

4

On Mollier chart, flow through turbine is represented by

A. Horizontal straight line

B. Vertical straight line

C. Straight inclined line

D. Curved line

What is the correct answer?

4

Lancashire boiler is

A. Stationary fire tube boiler

B. Internally fired boiler

C. Horizontal boiler

D. All of these

What is the correct answer?

4

The ratio of the actual vacuum to the ideal vacuum in a condenser is called

A. Condenser efficiency

B. Vacuum efficiency

C. Nozzle efficiency

D. Boiler efficiency

What is the correct answer?

4

Orsat meter is used for

A. Gravimetric analysis of the flue gases

B. Volumetric analysis of the flue gases

C. Mass flow of the flue gases

D. Measuring smoke density of flue gases

What is the correct answer?

4

Blading efficiency is also known as

A. Stage efficiency

B. Diagram efficiency

C. Nozzle efficiency

D. None of these

What is the correct answer?

4

In a reaction turbine

A. The steam is allowed to expand in the nozzle, where it gives a high velocity before it enters the moving blades

B. The expansion of steam takes place partly in the fixed blades and partly in the moving blades

C. The steam is expanded from a high pressure to a condenser pressure in one or more nozzles

D. The pressure and temperature of steam remains constant