Home
Current Affairs January 2024

What is the correct answer?

4

The pressure at which latent heat of vaporisation of water is zero, is

A. Below atmospheric pressure

B. 1 kg/cm²

C. 100 kg/cm²

D. 225.6 kg/cm²

Correct Answer :

D. 225.6 kg/cm²


Related Questions

What is the correct answer?

4

The efficiency of a boiler is defined as

A. Ratio of heat actually used in producing steam to the heat liberated in the furnace

B. Ratio of the mass of steam produced to the mass of total water supplied in a given time

C. Ratio of the heat liberated in the furnace to the heat actually used in producing steam

D. None of the above

What is the correct answer?

4

In a boiler, the heat is lost

A. To dry flue gases

B. In moisture present in the fuel

C. To steam formed by combustion of hydrogen per kg of fuel

D. All of the above

What is the correct answer?

4

In a De-Laval nozzle expanding superheated steam from 10 bar to 0.1 bar, the pressure at the minimum cross-section (i. e. pressure at throat, p₂) will be

A. 3.3 bar

B. 5.46 bar

C. 8.2 bar

D. 9.9 bar

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

At very low temperature, the melting and boiling temperatures become equal. This temperature is

A. 373°K

B. 273.16°K

C. 303°K

D. 0°K

What is the correct answer?

4

The draught may be produced by a

A. Mechanical fan

B. Chimney

C. A steam jet

D. All of these

What is the correct answer?

4

Which of the following compound steam engine requires a smaller flywheel?

A. Receiver type

B. Tandem type

C. Woolf type

D. All of these

What is the correct answer?

4

With increase in load, convection superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

What is the correct answer?

4

The ratio of the energy required to produce the artificial draught (expressed in metres head or J/kg of flue gas) to the mechanical equivalent of extra heat carried away per kg of flue gases due to natural draught, is known as

A. Efficiency of the boiler

B. Efficiency of the chimney

C. Efficiency of the fan

D. Power of the boiler

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

What is the correct answer?

4

The impulse reaction turbine has its driving force

A. As an impulsive force

B. As a reaction force

C. Partly as an impulsive force and partly as a reaction force

D. None of the above

What is the correct answer?

4

The diameter of tubes for natural circulation boiler as compared to controlled circulation boilers is

A. More

B. Less

C. Same

D. Could be more or less depending on other factors

What is the correct answer?

4

A throttle governed steam engine develops 15 kW with 280 kg per hour of steam and 35 kW with 520 kg per hour of steam. The steam consumption in kg per hour when developing 20 kW will be nearly

A. 150 kg/h

B. 210 kg/h

C. 280 kg/h

D. 340 kg/h

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

A device used in a boiler to control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required, is known as

A. Blow off cock

B. Fusible plug

C. Superheater

D. Stop valve

What is the correct answer?

4

The actual vacuum in a condenser is equal to

A. Barometric pressure + actual pressure

B. Barometric pressure - actual pressure

C. Gauge pressure + atmospheric pressure

D. Gauge pressure - atmospheric pressure

What is the correct answer?

4

The number of water level indicators in a boiler are generally _________ in number.

A. One

B. Two

C. Three

D. Four

What is the correct answer?

4

The flow of steam is supersonic

A. At the entrance to the nozzle

B. At the throat of the nozzle

C. In the convergent portion of the nozzle

D. In the divergent portion of the nozzle

What is the correct answer?

4

Pick up the wrong statement about water tube boiler in comparison to fire tube boilers

A. Former occupies less space for same power

B. Rate of steam flow is more in former case

C. Former is used for high installed capacity

D. Chances of explosion are less in former case.

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 equivalent evaporation is defined as

A. The ratio of heat actually used in producing the steam to the heat liberated in the furnace

B. The amount of water evaporated or steam produced in kg per kg of fuel burnt

C. The amount of water evaporated from and at 100°C into dry and saturated steam

D. The evaporation of 15.653 kg of water per hour from and at 100°C

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

A safety valve usually employed with stationary boilers is

A. Lever safety valve

B. Dead weight safety valve

C. High steam and low water safety valve

D. All of these

What is the correct answer?

4

Which of the following is required for a steam condensing plant?

A. Condenser

B. Condensate pump

C. Air extraction pump

D. All of these

What is the correct answer?

4

In cross compounding, the cylinders are arranged

A. Side by side and each cylinder has common piston, connecting rod and crank

B. Side by side and each cylinder has separate piston, connecting rod and crank

C. At 90° and each cylinder has common piston, connecting rod and crank

D. At 90° and each cylinder has separate piston, connecting rod and crank

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

There is always some steam left in the clearance space from the previous stroke. This steam left in the clearance space is called

A. Wet steam

B. Saturated steam

C. Superheated steam

D. Cushion steam

What is the correct answer?

4

The temperature of flue gases at air heater outlet should be

A. 100°C

B. Above dew point temperature of flue gases

C. Below dew point temperature of flue gases

D. Less than wet bulb temperature of flue gases

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

At which pressure the properties of water and steam become identical

A. 0.1 kg/cm²

B. 1 kg/cm²

C. 100 kg/cm²

D. 225.6 kg/cm²