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Stage efficiency is also known as

A. Diagram efficiency

B. Nozzle efficiency

C. Gross efficiency

D. None of these

Correct Answer :

C. Gross efficiency


Related Questions

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Which of the following substance will have same percentage in both proximate and ultimate analysis?

A. Ash

B. Volatile matter

C. Moisture

D. Hydrogen

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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

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At critical point, i.e. p = 225.65 kg/cm², the latent enthalpy of vaporisation is

A. Maximum

B. Minimum

C. Zero

D. Depends on temperature also

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For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is

A. 1 kg

B. 4/3 kg

C. 8/3 kg

D. 2 kg

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The steam enters 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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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

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Fire tube boilers are

A. Internally fired

B. Externally fired

C. Internally as well as externally fired

D. None of these

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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

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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 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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By compounding the expansion of steam in two or more cylinders, the ratio of expansion

A. Does not change

B. Increases

C. Decreases

D. None 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 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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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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Which of the following boilers is best suited to meet fluctuating demands?

A. Babcock and Wilcox

B. Locomotive

C. Lancashire

D. Cochran

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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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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

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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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The discharge is __________ at critical pressure.

A. Zero

B. Minimum

C. Maximum

D. None of these

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A boiler in India should conform to safety regulations of

A. DIN

B. BS

C. ASTM

D. IBR

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The object of producing draught in a boiler is

A. To provide an adequate supply of air for the fuel combustion

B. To exhaust the gases of combustion from the combustion chamber

C. To discharge the gases of combustion to the atmosphere through the chimney

D. All of the above

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Thermal equilibrium means that the flow of steam is

A. Isothermal

B. Isentropic

C. Hyperbolic

D. Polytropic

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The ratio of the isentropic heat drop to the heat supplied, is called

A. Reheat factor

B. Stage efficiency

C. Internal efficiency

D. Rankine efficiency

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The function of a piston in a steam engine is

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

B. To transfer motion from the piston to the crosshead

C. To convert heat energy of the steam into mechanical work id) to exhaust steam from the cylinder at proper moment

D. None of these

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The diameter of fire tube of Cornish boiler compared to its shell is

A. One half

B. One third

C. One fourth

D. One fifth

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The aim of a compound steam engine is

A. To reduce the ratio of expansion in each cylinder

B. To reduce the length of stroke

C. To reduce the temperature range in each cylinder

D. All of the above

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For combustion of a fuel, following is essential

A. Correct fuel air ratio

B. Proper ignition temperature

C. O₂ to support combustion

D. All the three above

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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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The critical pressure ratio for initially superheated steam is __________ as compared to initially dry saturated steam.

A. More

B. Less

C. Same

D. None of these

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De-Laval turbine is a

A. Simple impulse turbine

B. Simple reaction turbine

C. Impulse-reaction turbine

D. None of these