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Current Affairs January 2024

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Which is not correct statement about the function of furnace?

A. To provide proper conditions for continuous complete combustion

B. Mix fuel with air and ignite

C. Separate ash from coal

D. Maintain heat supply to prepare and ignite the incoming fuel

Correct Answer :

C. Separate ash from coal


Related Questions

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The function of a piston rod is

A. To guide motion of the piston rod and to prevent it from bending

B. To transfer motion from the piston to the cross head

C. To convert heat energy of the steam into mechanical work

D. To exhaust steam from the cylinder at proper moment

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A vessel into which the steam is exhausted and condensed after doing work in an engine cylinder or turbine is known as

A. Steam condenser

B. Steam boiler

C. Steam preheater

D. Economiser

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If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by

A. Throttling calorimeter

B. Separating calorimeter

C. Combined separating and throttling calorimeter

D. Bucket calorimeter

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With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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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

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The compounding of turbines is done in order to

A. Reduce speed of rotor

B. Improve efficiency

C. Reduce exit losses

D. All of these

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On Millier chart, the constant pressure lines

A. Diverge from left to right

B. Diverge from right to left

C. Are equally spaced throughout

D. First rise up and then fall

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The mechanical draught _________ with the amount of smoke.

A. Increases

B. Decreases

C. Does not effect

D. None of these

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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

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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

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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

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Hard coke is produced by carburisation of coal at

A. Atmospheric temperature

B. 500-600°C

C. 700-850°C

D. 950-1100°C

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Gusset stays in a boiler are provided to

A. Prevent the bulging of flat surfaces

B. Avoid explosion in furnace

C. Prevent leakage of hot flue gases

D. Support furnace freely from top

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The ratio of the useful heat drop to the isentropic heat drop is called

A. Condenser efficiency

B. Nozzle efficiency

C. Boiler efficiency

D. Vacuum efficiency

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In locomotives, the draught is produced by

A. Chimney

B. Induced draft fan

C. Both combined (A) and (B)

D. Steam jet draught

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Parson's turbine is a

A. Simple impulse turbine

B. Simple reaction turbine

C. Impulse-reaction turbine

D. None of these

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In an impulse turbine, steam expands

A. Wholly in blades

B. Wholly in nozzle

C. Partly in the nozzle and partly in blades

D. None of these

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The effect of super-saturation is that the

A. Mass of the steam discharged increases

B. Entropy and specific volume of the steam increases

C. Exit velocity of steam reduces

D. All of these

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In a single acting steam engine

A. The steam is admitted on one side of the piston and one working stroke is produced during each revolution of the crankshaft

B. The steam is admitted, in turn, on both sides of the piston and one working stroke is produced during each revolution of the crankshaft

C. The steam is admitted on one side of the piston and two working strokes are produced during each revolution of the crankshaft

D. The steam is admitted, in turn, on both sides of the piston and two working strokes are produced during each revolution of the crankshaft

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The fire tubes in a Locomotive boiler has _________ diameter.

A. 4.75 mm

B. 5.47 mm

C. 7.45 mm

D. 47.5 mm

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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

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Which of the following is steam dial?

A. Non-coking bituminous coal

B. Brown coal

C. Pulverised coal

D. Coking bituminous coal

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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

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Orsat meter is used for

A. Gravimetric analysis of the flue gases

B. Volumetric analysis of the flue gases

C. Mass flow of the flue gases

D. Measuring smoke density of flue gases

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The ratio of brake power to the indicated power is known as

A. Mechanical efficiency

B. Overall efficiency

C. Indicated thermal efficiency

D. Brake thermal efficiency

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When the cross-section of a nozzle increases continuously from entrance to exit, it is called a

A. Divergent nozzle

B. Convergent nozzle

C. Convergent-divergent nozzle

D. None of these

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4

The main object of a boiler trial is

A. To determine the generating capacity of the boiler

B. To determine the thermal efficiency of the boiler when working at a definite pressure

C. To prepare heat balance sheet for the boiler

D. All of the above

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In regenerative air preheaters, the heat is transferred

A. From a metal wall from one medium to another

B. From heating an intermediate material and then heating the air from this material

C. By direct mixing

D. Heat is transferred by bleeding some gas from furnace

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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

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Which of the following are boiler accessories?

A. Economiser

B. Superheater

C. Both (A) and (B)

D. None of these