Home
Current Affairs January 2024

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

Correct Answer :

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


Related Questions

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

A nozzle is said to be a divergent 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

The ultimate 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

The nozzle efficiency is the ratio of

A. Workdone on the blades to the energy supplied to the blades

B. Workdone on the blades per kg of steam to the total energy supplied per stage per kg of steam

C. Energy supplied to the blades per kg of steam to the total energy supplied per stage per kg of steam

D. None of the above

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

Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler?

A. Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler

B. Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler

C. Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes

D. Cornish boiler has two flue tubes whereas Lancashire boiler has one flue tube

What is the correct answer?

4

The maximum discharge through a chimney occurs when the height of chimney is

A. Infinitely long

B. Around 200 meters

C. Equal to the height of the hot gas column producing draught

D. Outside temperature is very low

What is the correct answer?

4

The basic purpose of drum in boiler is to

A. Serve as storage of steam

B. Serve as storage of feed water for water wall

C. Remove salts from water

D. Separate steam from water

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

In locomotives, the draught is produced by

A. Chimney

B. Induced draft fan

C. Both combined (A) and (B)

D. Steam jet draught

What is the correct answer?

4

Blow off cock in a boiler is used to

A. Control the flow of steam from the boiler to the main pipe and to shut off the steam completely when required

B. Empty the boiler when required and to discharge the mud, scale or sediments which are accumulated at the bottom of the boiler

C. Put off fire in the furnace of the boiler when the level of water in the boiler falls to an unsafe limit

D. Increase the temperature of saturated steam without raising its pressure

What is the correct answer?

4

Which of the following varieties of coals is mostly used in steam boilers?

A. Non-coking bituminous coal

B. Brown coal

C. Peat

D. None of the above

What is the correct answer?

4

The high pressure and low pressure cylinders in a Woolf type compound engine are regarded as having cranks

A. 180° to each other

B. 90° to each other

C. 0° to each other

D. None of these

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

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

O₂ content in atmospheric air on volume basis is

A. 21 %

B. 23 %

C. 30 %

D. 40 %

What is the correct answer?

4

Which of the following is steam dial?

A. Non-coking bituminous coal

B. Brown coal

C. Pulverised coal

D. Coking bituminous coal

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

Pick up the correct statement as regards Cornish boiler and Lancashire boiler

A. Cornish is fire tube and Lancashire is water tube

B. Cornish is water tube and Lancashire is fire tube

C. Cornish has two fire tubes and Lancashire has one

D. Lancashire has two fire tubes and Cornish has one

What is the correct answer?

4

The relative heat absorption for successively added equal areas of boiler convection heating surfaces

A. Increases

B. Decreases

C. Remain unaffected

D. First increases and then decreases

What is the correct answer?

4

The isentropic enthalpy drop in moving blade is two-third of the isentropic enthalpy drop in fixed blades of a turbine. The degree of reaction will be

A. 0.4

B. 0.56

C. 0.67

D. 1.67

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

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 water tubes in a Babcock and Wilcox boiler are

A. Horizontal

B. Vertical

C. Inclined

D. Horizontal and inclined

What is the correct answer?

4

A safety valve in a locomotive starts leaking. The leaking medium will be

A. Water

B. Dry steam

C. Wet steam

D. Super heated steam

What is the correct answer?

4

The draught produced by a steam jet issuing from a nozzle placed in the chimney is called

A. Induced steam jet draught

B. Chimney draught

C. Forced steam jet draught

D. None 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

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

Fire tube boilers are limited to a maximum working pressure of

A. 0.17 MN/m²

B. 1.7 MN/m²

C. 17 MN/m²

D. 170 MN/m²

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