Home
Current Affairs January 2024

What is the correct answer?

4

One kilowatt-hour energy is equivalent to

A. 1000 J

B. 360 kJ

C. 3600 kJ

D. 3600 kW/sec

Correct Answer :

C. 3600 kJ


Related Questions

What is the correct answer?

4

The height of chimney in a power plant is governed by

A. The draft to be created

B. Limitation of construction facilities

C. Control of pollution

D. Quantity of flue gases to be handled

What is the correct answer?

4

The condition of steam in boiler drum is always

A. Dry

B. Wet

C. Saturated

D. Supersaturated

What is the correct answer?

4

Alkaline pyrogallate is used in Orsat's apparatus for absorption of

A. CO₂

B. CO

C. O₂

D. N₂

What is the correct answer?

4

The pressure velocity compounded impulse turbine allows a bigger pressure drop and hence __________ numbers of stages are required.

A. More

B. Less

C. Equal

D. None of these

What is the correct answer?

4

Boiler H.P. is defined as the

A. Steam evaporation rate per kg of fuel fired

B. Work done in evaporating 1 kg of steam per hour from and at 100°C into dry saturated steam

C. The evaporation of 15.65 kg of water per hour from and at 100°C into dry saturated steam

D. Work done by 1 kg of steam at saturation condition

What is the correct answer?

4

The proximate analysis of fuel lists

A. Various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as percents by volume

B. Various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as percents by weight

C. Fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

D. Fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

What is the correct answer?

4

Cut-off governing of steam engines is a method of controlling the engine output by varying

A. Volume of intake steam

B. Pressure of intake steam

C. Temperature of intake steam

D. All of these

What is the correct answer?

4

If the critical pressure ratio for steam is 0.546, then the steam is initially

A. Wet steam

B. Dry saturated steam

C. Superheated steam

D. None of these

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 number of flue tubes in Lancashire boiler is

A. Zero

B. One

C. Two

D. Four

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

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

During storage, the heating value of coal

A. Increases

B. Decreases

C. Remain constant

D. May increase or decrease depending upon the method of storage

What is the correct answer?

4

The diagram factor is the ratio of the

A. Area of the actual indicator diagram to the area of theoretical indicator diagram

B. Actual workdone per stroke to the theoretical workdone per stroke

C. Actual mean effective pressure to the theoretical mean effective pressure

D. Any one of the above

What is the correct answer?

4

A device in which some portion of waste heat of flue gases is recovered to heat the air before it passes to the furnace for combustion purpose, is known as

A. Superheater

B. Air-preheater

C. Economiser

D. Injector

What is the correct answer?

4

The overall efficiency of thermal power plant is

A. Boiler efficiency, turbine efficiency, generator efficiency

B. All the three above plus gas cycle efficiency

C. Carnot cycle efficiency

D. Regenerative cycle efficiency

What is the correct answer?

4

In case of non-condensing steam engines, the pressure of steam in the cylinder during exhaust stroke is _________ the condenser pressure.

A. Equal to

B. Lower than

C. Higher than

D. None of these

What is the correct answer?

4

Willians line for the steam engine is a straight line relationship between the steam consumption per hour and

A. Indicated power

B. Brake power

C. Efficiency

D. Pressure of steam

What is the correct answer?

4

A packaged boiler is one in which various parts like firing equipment, fans, feed pumps and automatic controls are

A. Supplied by same manufacturer loose and assembled at site

B. Supplied mounted on a single base

C. Purchased from several parties and packed together at site

D. Packaged boiler does not exist

What is the correct answer?

4

The numbers of fire tubes in a Cochran boiler are

A. 75

B. 115

C. 165

D. 225

What is the correct answer?

4

A device used to heat feed water by utilising the heat in me exhaust flue gases before leaving through the chimney, is known as

A. Economiser

B. Fusible plug

C. Superheater

D. Stop valve

What is the correct answer?

4

In a 50% reaction turbine stage, tangential component of absolute velocity at rotor inlet is 537 m/s and the blade velocity is 454 m/s. The power output in kW of steam will be

A. 260 kW

B. 282 kW

C. 296 kW

D. 302 kW

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 friction present between the steam and the nozzle surfaces reduces the heat drop by

A. 10 to 15 %

B. 15 to 25 %

C. 25 to 40 %

D. 40 to 60 %

What is the correct answer?

4

Cochran boiler is a

A. Horizontal fire tube boiler

B. Horizontal water tube boiler

C. Vertical water tube boiler

D. Vertical fire tube boiler

What is the correct answer?

4

The size of a boiler drum in pulverised fuel fired boiler, as its size and capacity, (steam pressure and flow ratings) increase

A. Increases

B. Decreases

C. Remains unchanged

D. Increases/decreases depending on steam temperature requirements

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 ratio of the clearance volume 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

Caking coals are those which

A. Form lumps or masses of coke

B. Burn freely

C. Show little or no fusing action

D. Burn completely

What is the correct answer?

4

The draught (in mm of water), for maximum discharge of flue gases through the chimney, is given by (where H = Height of the chimney in metres, and T1 = Absolute temperature of air outside the chimney in K)

A. T1 /88.25H

B. 88.25H/T1

C. T1 /176.5H

D. 176.5H/T1