2101. Green coal, in order to be burnt, must be____________________?
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A. burnt as powder

B. heated to its ignition point

C. burnt in excess air

D. heated sufficiently

E. burnt as lumps

2102. Ultimate analysis of fuel is determination of percentage of____________________?
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A. fixed carbon, ash, volatile matter, moisture

B. best analysis

C. higher calorific value

D. lower calorific value

E. carbon, hydrogen, nitrogen, sulphur, moisture
2103. The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?
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A. unpredictable

B. same

C. less

D. less or more depending on size of boiler

E. more
2104. Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?
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A. high calorific value coal being burnt

B. raising of steam temperature

C. fouling of heat transfer surfaces

D. leakage of air

E. higher effectiveness of boiler

2105. The height of chimney in a power plant is governed by__________________?
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A. control of pollution

B. limitation of construction facilities

C. the draft to be created

D. all of the above

E. quantity of flue gases to be handled

2106. Which device is used in thermal power plants to reduce level of pollution___________________?
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A. chimney

B. induced draft fan

C. smoke meter

D. precipitator

E. pulveriser

2107. Which is not correct statement about the function of furnace____________________?
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A. mix fuel with air and ignite

B. to provide proper conditions for con-tinuous complete combustion

C. to minimise radiation losses

D. separate ash from coal

E. maintain heat supply to prepare and ignite the incoming fuel

2108. In locomotives, the draught is produced by_________________?
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A. chimney

B. induced draft fan

C. both combined A. and B.

D. steam jet draught

E. none of the above

2109. Boiler parameters are expressed by ___________________?
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A. pressure of steam in kg/cm2

B. all of the above

C. temperature of steam in C

D. tonnes/hr. of steam

E. none of the above

2110. Which is not correct statement about effect of sulphur in fuel ___________________?
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A. it helps in electrostatic precipitation of ash in flue-gases

B. none of the above

C. it has heating value

D. it erodes furnace walls

E. it leads to corrosion of air heaters, ducting, etc. if flue gas exit temperature is low

2111. Which is not correct statement about pulverised fuel firing ?
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A. it is the best technique for burning high ash content fuel having low fusion ash

B. heat release can be easily controlled

C. separate mills are required to powder the coal

D. fuel burns economically

E. high burning rate is possible

2112. Calorific value of coal is of the order of _______________________?
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A. 200-400 kcal/kg

B. 2000-4000 kcal/kg

C. 5000-8000 kcal/kg

D. 8000-10,000 kcal/kg

E. 800-1200 kcal/kg

2113. The feed check valve is used in order to ______________________?
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A. none of the above

B. regulate flow of boiler water

C. recirculate unwanted feed water

D. check level of water in boiler drum

E. allow high pressure feed water to flow to drum and not allow reverse flow to take place
2114. The stress developed in a material at breaking point in extension is called__________?
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A. Proof stress

B. Yield point stress

C. Breaking stress

D. Fracture stress

2115. The patrol is distilled at a temperature from :
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A. 6 to 20

B. 220 to 345

C. 15 to 120

D. 65 to 220
2116. The temperature of flue gases at air heater outlet should be__________________?
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A. below dew-point temperature of flue gases

B. above dew-point temperature of flue gases

C. less than wet bulb temperature of flue gases

D. 100C

E. above wet bulb temperature of flue gases

2117. The condition of steam in boiler drum is always ___________________?
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A. wet

B. saturated

C. supersaturated

D. superheated

E. dry

2118. Which is not the correct statement about moisture in coal ______________________?
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A. some moisture in coal helps in better burning which is not possible with completely dry coal

B. in some coals moisture may be present upto 40%

C. moisture in coal is removed before firing by heating it with hot air

D. inherent moisture and surface moisture are different things

E. it increases thermal efficiency
2119. Diesel Cycle is also known as : __________?
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A. Constant Volume cycle

B. All of above

C. Constant temperature cycle

D. Constant Pressure Cycle
2120. The proximate analysis of fuel lists__________________?
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A. various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight

B. various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume

C. fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash

D. fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash

E. moisture and ash free heating value

2121. With increase in load, convection superheater has_______________________?
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A. drooping characteristic

B. linear characterisstic

C. none of the above

D. flat characteristic

E. rising characteristic
2122. For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?
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A. heating surface depends on other parameters

B. equal heating surface

C. less heating surface

D. more heating surface

E. none of the above

2123. In designing air preheater, the important design consideration is that_________________?
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A. handling and maintenance should be easier

B. stack gases should not be cooled to the dew point

C. approach temperature should be as low as possible

D. none of the above

E. heat transfer area should be optimum

2124. Gusset stays in a boiler are provided to____________________?
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A. avoid explosion in furnace

B. support furnace freely from top

C. prevent atmospheric air leaking into furnace

D. prevent leakage of hot flue gases

E. prevent the bulging of flat surfaces
2125. The basic job of feed water treatment in boilers is to overcome the problem of __________________?
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A. all of the above

B. embrittlement

C. carryover

D. scale

E. corrosion

2126. In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?
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A. may improve/worsen depending on size

B. unpredictable

C. remain unaffected

D. improve C. worsen

2127. Feed water conditioning in thermal power plants in done to__________________?
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A. increase *heat transfer rate

B. increase steam parameters

C. all of the above

D. increase efficiency-of thermal power plant

E. reduce hardness and for removal of solids

2128. Atmospheric pressure is equal to____________?
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A. All of these

B. 1.013 bar

C. 101.3KN/m2

D. 760mm of Hg

2129. Farad is the unit of___________?
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A. inductance

B. capacitance

C. None of these

D. voltage

2130. The safety valve on boiler drum compared to safety valve on super heater is set at ________________?
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A. lower value

B. lower/higher depending on steam flow

C. unpredicatble

D. same value

E. higher value
2131. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
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A. increases

B. remains unchanged

C. decreases

D. unpredictable

E. increases/decreases depending on steam temperature requirements

2132. Which of the following solid fuel has high caloric value : ___________?
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A. Peat

B. Wood

C. Anthracite coal

D. Bituminous coal

2133. Pick up wrong statement about desired properties of a good fuel__________________?
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A. produce minimum smoke and gases

B. ease in storing

C. ecomomical

D. high ignition point

E. high calorific value

2134. Which of the following solid fuel has high carbon content?
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A. None of these

B. Peat

C. Coke

D. Coal

2135. Which of the following is mostly used used as blast furnace fuel for extracting pig iron from iron ores?
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A. Brown coal

B. Anthracite coal

C. Woodchar coal

D. Hard coke
2136. What is the weight (in lbf) of one gallon of air at 1 atm and 25?C? The molecular mass of air is 28.97 g/mole = 0.02897 kg/mole
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A. 0.00989 lbf

B. 65.78lbf

C. 3.00989 lbf

D. 90lbf

2137. Which of the following are used in diesel engines and oil fired boilers :
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A. Gasoline

B. Patrol

C. Heavy fuel oils

D. Paraffin

2138. The efficiency of the ideal diesel cycle is ________ than that of Otto cycle, for the same compression ratio
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A. None of these

B. Equal

C. Higher

D. Lower

2139. Compression efficiency is compared against_____________________?
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A. isothermal compression

B. adiabatic compression

C. isentropic compression

D. botii isothermal and adiabatic compression

E. ideal compression

2140. During peak load periods, the best method of controlling compressors is___________________?
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A. constant speed unloader

B. relief valve

C. start-stop motor

D. variable speed

E. none of the above

2141. Out of the following, from where you will prefer to take intake for air compressor_________________?
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A. from any one of the above locations

B. from coal yard side

C. from outside atmosphere at 1C

D. from an air conditioned room maintained at 20C

E. from a side where cooling tower is located nearby
2142. The vloumetric efficiency of compressor with increase in compression ratio will ___________________?
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A. may increase/decrease depending on clearance volume

B. increase

C. remain same

D. decrease

E. none of the above

2143. Clearance volume in actual reciprocating compressors is essential __________________?
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A. to attain high volumetric efficiency

B. to provide cushioning effect and also to avoid mechanical bang of piston with cylinder head

C. to avoid mechanical bang of piston with cylinder head

D. to provide cushioning effect

E. to accommedate Valves in the cylinder head

2144. There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
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A. remain same

B. decrease

C. unpredictable

D. none of the above

E. increase
2145. Surging is the phenomenon of___________________?
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A. air stream blocking the passage

B. unsteady, periodic and reversed flow

C. air stream not able to follow the blade contour

D. production of no air pressure

E. motion of air at sonic velocity

2146. In turbo fan engine, the jet velocity as compared to turbo-jet engine is_________________?
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A. may be less or more depening upon speed

B. less

C. same

D. none of the above

E. more

2147. A closed gas turbine in which fuel is burnt directly in the air is not possible because of__________________?
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A. high friction losses

B. paucity of 02

C. high pressure ratio

D. high specific volume

E. increasing gas temperature

2148. The ideal efficiency of simple gas turbine cycle depends on________________?
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A. minimum cycle temperature

B. maximum cycle temperature

C. none of the above

D. all of the above

E. pressure ratio
2149. The thrust on the rotor in a centrifugal compressor is produced by________________?
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A. resultant component

B. tangential component

C. axial component

D. radial component

2150. Axial flow compressor resembles____________________ ?
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A. none of the above

B. turbine

C. centrifugal pump

D. reciprocating pump

E. sliding vane compressor