Mechanical Engineering MCQs

2075 MCQs (Page 144 of 208)

Attempt Mechanical Engineering Mcqs Quiz

In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?

A. Remain unaffected
B. Improve c. worsen
C. May improve/worsen depending on size
D. Unpredictable

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Natural water circulation, by convection in water tube boilers, with increase in pressure of boiler _________________?

A. Increases
B. Decreases
C. Remains unaffected
D. First increases and then decreases

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Deaeration 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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During storage, the heating value of coal __________________?

A. Increases
B. Decreases
C. Remains constant
D. May increase or decrease depending upon the method of storage

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For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?

A. More heating surface
B. Less heating surface
C. Equal heating surface
D. Heating surface depends on other parameters

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Film boling occurs at _______________________?

A. Very low pressure
B. Atmospheric pressures
C. Medium pressures
D. Very high pressures

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The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

A. Increases
B. Decreases
C. Remains unchanged
D. Increases/decreases depending on steam temperature requirements

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The basic job of feed water treatment in boilers is to overcome the problem of __________________?

A. corrosion
B. scale
C. carryover
D. embrittlement

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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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In water wall furnace, the heat is transferred to the water-walls by _________________?

A. Convection
B. Radiation
C. Conduction
D. Radiation and conducton

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