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4

Film boiling occurs at

A. Very low pressure

B. Atmospheric pressures

C. Medium pressures

D. Very high pressures

Correct Answer :

D. Very high pressures


Related Questions

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Multi-stage steam turbines are of the

A. Velocity compounded type

B. Reaction type

C. Pressure compounded type

D. All of these

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The diameter of cylindrical shell of the Lancashire boiler is of the order of

A. 1 to 1.25m

B. 1 to 1.75 m

C. 2 to 4 m

D. 1.75 to 2.75 m.

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De-Laval turbine is a

A. Single rotor impulse turbine

B. Multi-rotor impulse turbine

C. Impulse reaction turbine

D. None of these

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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

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The reheat factor depends upon

A. Initial pressure and superheat

B. Exit pressure

C. Turbine stage efficiency

D. All of these

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The average value of diagram factor lies between

A. 0.2 to 0.5

B. 0.5 to 0.65

C. 0.65 to 0.9

D. 0.8 to 1.2

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One kg of steam sample contains 0.8 kg dry steam; Its dryness fraction is

A. 0.2

B. 0.8

C. 1.0

D. 0.6

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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

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4

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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An ideal regenerative cycle is

A. Equal to Carnot cycle

B. Less than Carnot cycle

C. More than Carnot cycle

D. Could be anything

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Feed water conditioning in thermal power plants in done to

A. Reduce hardness and for removal of solids

B. Increase efficiency of thermal power plant

C. Increase heat transfer rate

D. Increase steam parameters

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In accelerated circulation type boiler

A. Heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum

B. Water is supplied in drum and through down comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam

C. Feed pump is employed to supplement natural circulation in water wall type furnace

D. Water is converted into steam in one pass without any recirculation

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The feed check valve is used in order to

A. Regulate flow of boiler water

B. Check level of water in boiler drum

C. Recirculate unwanted feed water

D. Allow high pressure feed water to flow to drum and not allow reverse flow to take place

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Thermal efficiency of well maintained boiler will be of the order

A. 40 %

B. 50 %

C. 75 %

D. 90 %

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A steam turbine, in which a part of the steam after partial expansion, is used for process heating and the remaining steam is further expanded for power generation, is known as

A. Back pressure turbine

B. Pass out turbine

C. Low pressure turbine

D. Impulse turbine

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Steam exhaust from high pressure turbine is reheated in

A. Boiler drums

B. Superheater tubes

C. Economiser

D. A separate coil located in convection path.

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When the nozzle operates with the maximum mass flow, the nozzle is said to be

A. Choked

B. Under-damping

C. Over-damping

D. None of these

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The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is

A. Less

B. More

C. Equal

D. May be less or more depending on temperature

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Boiler parameters are expressed by

A. Tonnes/hr. of steam

B. Pressure of steam in kg/cm²

C. Temperature of steam in °C

D. All of the above

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In a glass tube type water indicator for a boiler, one end of the tube is connected to water space and the other end is connected to

A. Water space also

B. Chimney

C. Steam space

D. Superheater

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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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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

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Pour point of fuel oil is the

A. Lowest temperature at which oil will flow under set condition

B. Storage temperature

C. Temperature at which fuel is pumped through burners

D. Temperature at which oil is transported

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4

Desecration of feed water is carried out because it reduces

A. Cavitation of boiler feed pumps

B. Corrosion caused by oxygen

C. Heat transfer coefficient

D. pH value of water

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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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Water at pressure of 4 kg/cm² and 160°C temperature when exposed to atmosphere will

A. Boil

B. Flash i.e. get converted into steam

C. Remain as it was

D. Cool down

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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

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4

The bituminous coal is no caking if its carbon content is

A. 78-81 %

B. 81-85 %

C. 85-90 %

D. 90-95 %

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Besides mean effective pressure, the data required to determine the indicated power of an engine include

A. Piston diameter, length of stroke and calorific value of fuel

B. Piston diameter, specific fuel consumption and Calorific value of fuel

C. Piston diameter, length of stroke and speed of rotation

D. Specific fuel consumption, speed of rotation and torque

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Throttle 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