Home
Current Affairs January 2024

What is the correct answer?

4

The purpose of governing in steam turbines is to

A. Maintain the speed of the turbine

B. Reduce the effective heat drop

C. Reheat the steam and improve its quality

D. Completely balance against end thrust

Correct Answer :

A. Maintain the speed of the turbine


Related Questions

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

In water wall furnace, the heat is transferred to the water walls by

A. Convection

B. Radiation

C. Conduction

D. Radiation and conduction

What is the correct answer?

4

The aim of a compound steam engine is

A. To reduce the ratio of expansion in each cylinder

B. To reduce the length of stroke

C. To reduce the temperature range in each cylinder

D. All of the above

What is the correct answer?

4

Which of the following are boiler accessories?

A. Economiser

B. Superheater

C. Both (A) and (B)

D. None of these

What is the correct answer?

4

In fire tube boilers

A. Water passes through the tubes which are surrounded by flames and hot gases

B. The flames and hot gases pass through the tubes which are surrounded by water

C. Forced circulation takes place

D. None of these

What is the correct answer?

4

The diameter of flue tube in a Cornish boiler is _________ that of the shell.

A. One-fourth

B. One-third

C. Two-fifth

D. Three-fifth

What is the correct answer?

4

Locomotive type' boiler is

A. Horizontal multi-tubular water tube boiler

B. Water wall enclosed furnace type

C. Vertical tubular fire tube type

D. Horizontal multi-tubular fire tube type

What is the correct answer?

4

The effect of friction on the flow of steam through a nozzle is to

A. Decrease the mass flow rate and to increase the wetness of steam

B. Increase the mass flow rate and to increase the exit temperature

C. Decrease the mass flow rate and to decrease the wetness of steam

D. Increase the exit temperature without any effect on mass flow rate

What is the correct answer?

4

Equivalent evaporation is the amount of water evaporated in a boiler from and at

A. 0°C

B. 100°C

C. Saturation temperature at given pressure

D. Room temperature

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

In a receiver type compound engine, the high pressure and low pressure cylinders

A. Have common piston rod

B. Are set at 90°

C. Have separate piston rods

D. Are set in V-arrangement

What is the correct answer?

4

In a Tandem type compound engine, the high pressure and low pressure cylinders

A. Have common piston rod

B. Are set at 90°

C. Have separate piston rods

D. Are set in V-arrangement

What is the correct answer?

4

The function of a flywheel is

A. To convert reciprocating motion of the piston into rotary motion

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

C. To prevent fluctuation of speed

D. To keep the engine speed uniform at all load conditions

What is the correct answer?

4

The stage efficiency (ηS) is given by (where ηB = Blading efficiency, and ηN = Nozzle efficiency)

A. ηS = ηB × ηN

B. ηS = ηB / ηN

C. ηS = ηN / ηB

D. None of these

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

An air preheater

A. Increases evaporative capacity of the boiler

B. Increases the efficiency of the boiler

C. Enables low grade fuel to be burnt

D. All of the above

What is the correct answer?

4

The effect of bleeding is that

A. It increases the thermodynamic efficiency of the turbine

B. Boiler is supplied with hot water

C. It decreases the power developed by the turbine

D. All of the above

What is the correct answer?

4

Which of the following is a fire tube boiler?

A. Lancashire boiler

B. Babcock and Wilcox boiler

C. Yarrow boiler

D. None of these

What is the correct answer?

4

Efficiency of a thermal cycle increases by

A. Regeneration

B. Reheating of steam

C. Both (A) and (B)

D. Cooling of steam

What is the correct answer?

4

In forced 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

What is the correct answer?

4

Latent heat of dry steam at atmospheric pressure is equal to

A. 539 kcal/ kg

B. 539 BTU/ lb

C. 427 kcal/ kg

D. 100 kcal/ kg

What is the correct answer?

4

The working pressure range for a LaMont boiler is

A. 0.5 to 10 MN/m²

B. 1 to 15 MN/m²

C. 2.5 to 15 MN/m²

D. 3.5 to 20 MN/m²

What is the correct answer?

4

De-Laval 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 amount of water evaporated in kg per kg of fuel burnt is called

A. Evaporative capacity of a boiler

B. Equivalent evaporation from and at 100° C

C. Boiler efficiency

D. None of these

What is the correct answer?

4

The maximum heat loss is a boiler occurs due to

A. Moisture in fuel

B. Dry flue gases

C. Steam formation

D. Unburnt carbon

What is the correct answer?

4

Benson boiler requires

A. No drum

B. One drum

C. Two drums

D. Three drums

What is the correct answer?

4

Which is not the correct statement about moisture in coal?

A. Inherent moisture and surface moisture are different things

B. In some coals moisture may be present up to 40%

C. Some moisture in coal helps in better burning which is not possible with completely dry coal

D. It increases thermal efficiency

What is the correct answer?

4

Which of the following boiler is best suited to meet the fluctuating demand of steam?

A. Locomotive boiler

B. Lancashire boiler

C. Cornish boiler

D. Babcock and Wilcox boiler

What is the correct answer?

4

An economiser _________ the steam raising capacity of a boiler.

A. Increases

B. Decreases

C. Has no effect on

D. None of these

What is the correct answer?

4

The ratio of the temperature rise of cooling water to the vacuum temperature minus inlet cooling water temperature is called

A. Condenser efficiency

B. Vacuum efficiency

C. Nozzle efficiency

D. Boiler efficiency