Home
Current Affairs January 2024

What is the correct answer?

4

The safety valve on boiler drum compared to safety valve on superheater is set at

A. Same value

B. Higher value

C. Lower value

D. Lower/higher depending on steam flow

Correct Answer :

B. Higher value


Related Questions

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

Which of the following statement is wrong?

A. The mechanical draught reduces the height of chimney.

B. The natural draught reduces the fuel consumption.

C. A balanced draught is a combination of induced and forced draught.

D. All of the above

What is the correct answer?

4

Which of the following statement is correct?

A. A horizontal steam engine requires less floor area than a vertical steam engine

B. The steam pressure in the cylinder is not allowed to fall below the atmospheric pressure

C. The compound steam engines are generally non-condensing steam engines

D. All of the above

What is the correct answer?

4

Locomotive boiler is a

A. Single tube, horizontal, internally fired and stationary boiler

B. Single tube, vertical, externally fired and stationary boiler

C. Multi-tubular, horizontal, internally fired and mobile boiler

D. Multi-tubular, horizontal, externally fired and stationary boiler

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

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

The ratio of the workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam is called

A. Blading efficiency

B. Nozzle efficiency

C. Stage efficiency

D. Mechanical efficiency

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

The chimney draught varies with

A. Climatic conditions

B. Temperature of furnace gases

C. Height of chimney

D. All of these

What is the correct answer?

4

Carbonisation of coal is the process of

A. Pulverising coal in inert atmosphere

B. Heating wood in a limited supply of air at temperatures below 300°C

C. Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. Binding the pulverised coal into briquettes

What is the correct answer?

4

When the speed of the engine is controlled by means of a valve in a steam pipe, which regulates the pressure of steam entering the engine, then the governing is known as

A. Throttle governing

B. Cut-off governing

C. By-pass governing

D. None of these

What is the correct answer?

4

Over fire burning is the phenomenon of

A. Supply of excess, air

B. Supply of excess coal

C. Burning CO and unburnts in upper zone of furnace by supplying more air

D. Fuel bed firing

What is the correct answer?

4

Steam turbines may be classified according to

A. Direction of steam flow

B. Number of stages

C. Mode of steam action

D. All of these

What is the correct answer?

4

An air preheater is installed

A. Before the economiser

B. Before the superheater

C. Between the economiser and chimney

D. None of these

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

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

The length of Cornish boiler is of the order of

A. 24 m

B. 35 m

C. 57.5 m

D. 79 m

What is the correct answer?

4

A nozzle is said to be a convergent nozzle

A. When the cross-section of the nozzle increases continuously from entrance to exit

B. When the cross-section of the nozzle decreases continuously from entrance to exit

C. When the cross-section of the nozzle first decreases from entrance to throat and then increases from its throat to exit

D. None of the above

What is the correct answer?

4

O₂ content in atmospheric air on weight basis is

A. 21 %

B. 23 %

C. 30 %

D. 40 %

What is the correct answer?

4

The steam leaves the nozzle at a

A. High pressure and a low velocity

B. High pressure and a high velocity

C. Low pressure and a low velocity

D. Low pressure and a high velocity

What is the correct answer?

4

Which of the following statement is correct?

A. The efficiency of steam turbines is greater than steam engines

B. A flywheel is a must for steam turbine

C. The turbine blades do not change the direction of steam issuing from the nozzle

D. The pressure of steam, in reaction turbines, is increased in fixed blades as well as in moving blades

What is the correct answer?

4

In order to reduce the rotor speed of an impulse turbine, the method employed is

A. Velocity compounding

B. Pressure compounding

C. Pressure-velocity compounding

D. All of these

What is the correct answer?

4

The maximum steam pressure in a Locomotive boiler is limited to

A. 0.18 MN/m²

B. 1.8 MN/m²

C. 18 MN/m²

D. 180 MN/m²

What is the correct answer?

4

In a compound steam engine, the first stage of expansion is carried out in a high pressure cylinder whereas the last expansion is completed in low pressure cylinder. The diameter of high pressure cylinder is _________ the low pressure cylinder.

A. Equal to

B. Less than

C. More than

D. None of these

What is the correct answer?

4

The function of injector used in small steam plants is to

A. Create vacuum in furnace

B. Create vacuum at turbine exhaust

C. Pump feed water

D. Dose chemicals in feed water

What is the correct answer?

4

Mechanical equivalent of heat for 1 kcal or Joule's equivalent is equal to

A. 421 kg.m

B. 421 kg.m

C. 539 kg.m

D. 102 kg.m

What is the correct answer?

4

A binary vapour plant consists of

A. Steam turbine

B. Steam condenser

C. Mercury boiler

D. All of these

What is the correct answer?

4

When the circulation of water, in a boiler, is by a centrifugal pump, then the boiler is known as

A. Internally fired boiler

B. Externally fired boiler

C. Natural circulation boiler

D. Forced circulation boiler

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 steam temperature with increase in load in case of a boiler fitted with radiation superheater

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases