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Current Affairs January 2024

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4

Calorific value of coal is of the order of

A. 200-400 kcal/ kg

B. 800-1200 kcal/ kg

C. 2000-4000 kcal/ kg

D. 5000-8000 kcal/ kg

Correct Answer :

C. 2000-4000 kcal/ kg


Related Questions

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4

The diameters of fire tubes and superheater tubes in locomotive boiler are

A. 47.5 mm, 130 mm

B. 32.5 mm, 180 mm

C. 65.5 mm, 210 mm

D. 24.5 mm, 65 mm

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4

Ultimate analysis of fuel is determination of percentage of

A. Carbon, hydrogen, nitrogen, sulphur, moisture

B. Fixed carbon, ash, volatile matter, moisture

C. Higher calorific value

D. Lower calorific value

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4

The efficiency of steam turbines may be improved by

A. Reheating of steam

B. Regenerative feed heating

C. Binary vapour plant

D. Any one of these

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4

With increase in load, radiant superheater has

A. Drooping characteristic

B. Linear characteristic

C. Rising characteristic

D. Flat characteristic

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4

The clearance in the engine cylinder

A. Increases the mean effective pressure

B. Increases the workdone

C. Decreases the efficiency of the engine

D. All of these

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4

The latent heat of steam with increase of pressure

A. Remain same

B. Increases

C. Decreases

D. Behaves unpredictably

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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

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4

In turbines, the fluid undergoes a continuous steady flow process and the speed of flow is

A. Low

B. Very low

C. High

D. Very high

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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

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4

Which is not correct statement about pulverised fuel firing?

A. High burning rate is possible

B. Heat release can be easily controlled

C. Fuel burns economically

D. It is the best technique for burning high ash content fuel having low fusion ash

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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

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4

The theoretical indicator diagram of a simple steam engine is based upon the assumption that

A. There is no pressure drop due to condensation

B. Steam is admitted at boiler pressure and exhausted at condenser pressure

C. The expansion (or compression) of the steam is hyperbolic

D. All of the above

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4

The function of a valve rod is

A. To provide reciprocating motion to the slide valve

B. To convert reciprocating motion of the piston into rotary motion of the crank

C. To convert rotary motion of the crankshaft into to and fro motion of the valve rod

D. To provide simple harmonic motion to the D-slide valve

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4

Adiabatic process is

A. Essentially an isentropic process

B. Non-heat transfer process

C. Reversible process

D. Constant temperature process

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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

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4

The length of Cornish boiler is of the order of

A. 24 m

B. 35 m

C. 57.5 m

D. 79 m

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4

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

A. Equal to

B. Lower than

C. Higher than

D. None of these

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4

The maximum discharge of steam through a convergent-divergent nozzle depends upon

A. Area of nozzle at throat

B. Initial pressure and volume of steam

C. Final pressure of steam leaving the nozzle

D. Both (A) and (B)

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4

A valve installed between the boiler and the feed pump is

A. Blow off cock

B. Feed check valve

C. Steam stop valve

D. None of these

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4

The mechanical draught _________ with the amount of smoke.

A. Increases

B. Decreases

C. Does not effect

D. None of these

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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

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4

In a steam condenser, the partial pressure of steam and air are 0.06 bar and 0.007 bar respectively. The condenser pressure is

A. 0.007 bar

B. 0.053 bar

C. 0.06 bar

D. 0.067 bar

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4

All steam engines work on

A. Zeroth law of thermodynamics

B. First law of thermodynamics

C. Second law of thermodynamics

D. None of these

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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

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4

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

A. CO₂

B. CO

C. O₂

D. N₂

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4

Which of the following is a water tube boiler?

A. Locomotive boiler

B. Cochran boiler

C. Cornish boiler

D. Babcock and Wilcox boiler

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4

The diameter of a cylindrical shell of a Scotch marine boiler varies from

A. 1.5 to 2 m

B. 2.5 to 3.5 m

C. 3.5 to 4.5 m

D. None of these

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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

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4

When the inlet pressure of steam is equal to the exit pressure, then

A. There is a pressure drop in the nozzle

B. Fluid flows through the nozzle

C. Pressure drops and fluid flows through the nozzle

D. There is no pressure drop and fluid does not flow through the nozzle

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4

In reaction turbines, the axial thrust is due to

A. Pressure drop across the rotor

B. Change in axial velocity

C. Both (A) and (B)

D. None of these