3351. Efficiency of rankine cycle can be increased by_________________?
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A. decreasing exhaust pressure

B. increasing number of regenerative heaters

C. decreasing initial steam pressure and temperature

D. increasing exhaust pressure

E. increasing the expansion ratio

3352. The coal requirement per kW hour generation in the thermal power plant is of the order of__________________?
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A. 1.5 to 2 kg

B. 0.2 to 0.4 kg

C. 1.0 to 1.5 kg

D. 0.6 to 0.8 kg

E. 0.1 to 0.2 kg

3353. Coke is produced by__________________?
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A. enriching carbon in the coal

B. pulverising coal in inert atmosphere

C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel

D. heating wood in a limited supply of air at temperatures below 300GC

E. binding the pulverised coal into brick-etts

3354. Stoichiometric quantity of air is the___________________?
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A. air required for optimum combustion so as to have reasonable excess air

B. air present in atmosphere at NTP conditions

C. air required to convert CO into C02

D. air required to form an explosive mixture

E. air required for complete combustion of fuel with no excess air
3355. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?
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A. wet

B. none of the above

C. superheated

D. remain dry satruated

E. dry

3356. The increase in pressure _________________?
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A. raises the boiling point of a liquid

B. lowers the boiling point of a liquid

C. none of the above

D. .does not affect the boiling point of a liquid

E. reduces its volume

3357. Which of the following substance will have same percentage in both proximate and ultimate analysis___________________?
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A. ash

B. volatile matter

C. moisture

D. hydrogen

E. none of the above

3358. The basic purpose of drum in boiler is to_____________________?
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A. serve as storage of feed water for water wall

B. control level

C. serve as storage of steam

D. remove salts from water

E. separate steam from water
3359. While steam expands in turbines, theoretically the entropy________________?
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A. decreases

B. remains constant

C. none of the above

D. increases

E. behaves unpredictably

3360. For burning 1 kg of carbon to CO as per chemically correct combusiton, amount of air required is___________________?
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A. 8/3kg

B. 2 kg

C. 4/3kg

D. 1 kg

E. 16/3 kg

3361. In locomotive boiler, maximum steam pressure is limited to_______________?
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A. 31 kg/cm2

B. 1 kg/cm2

C. 18 kg/cm2

D. 5 kg/cm2

E. 10 kg/cm2

3362. The high pressure boiler is oiie producing steam at a pressure more than_________________?
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A. 5 kg/cm2

B. 75-80 kg/cm2

C. 10 kg/cm2

D. 40 kg/cm2

E. atmospheric pressure

3363. Sublimation region is the region where__________________?
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A. solid and vapour phases are in equi-librium

B. liquid and vapour phases are in equilibrium

C. solid, liquid and vapour phases are in equilibrium

D. none of the above

E. solid and liquid phases are in equilibrium

3364. Equivalent evaporation is the amount of water evaporated in a boiler from and at ____________________?
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A. room temperature

B. 100C

C. saturation temperature at given pressure

D. 0C

E. 20C

3365. Which of the following boilers is best suited to meet fluctuating demands___________________?
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A. cochran

B. lancashire

C. locomotive

D. babcock and wilcox

E. comish

3366. Equivalent evaporation of water is the evaporation for a feed water supply at 100C__________________?
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A. and its corresponding conversion into dry steam at desired boiler pressure

B. and its corresponding conversion into dry saturated steam at 100C and 1.033 kg/cm2

C. conversion into steam at the same pres-sure at which feed water is supplied

D. conversion into steam at atmospheric condition

E. none of the above

3367. Locomotive type boiler is__________________?
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A. water wall enclosed furnace type

B. horizontal multi-tubular fire tube type

C. vertical tubular fire tube type

D. none of the above types

E. horizontal multitubular water tube boiler

3368. Steam engine operates on_________________?
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A. Stirling cycle

B. brayton cycle

C. carnot cycle

D. joule cycle

E. none of the above

3369. One kilowatt-hour energy is equivalent to ________________?
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A. 1000 J

B. 3600 kW/sec

C. 3600 kJ

D. 360 kJ

E. 1000 kJ

3370. The critical pressure at which latent heat of vaporisation is zero is________________?
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A. 1 kgf/cm2

B. 1 kgf/cm2

C. 100 kgf/cm2

D. 273 kgf/cm2

E. 225.65 kgf/cm2
3371. The diameter of cylindrical shell of the Lancashire boiler is of the order of__________________?
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A. 1.75 to 2.75 m

B. 2.25 to 4.5 m

C. 2 to 4 m

D. 1 to 1.75 m

E. 1 tp 1.25m

3372. The lenght of Cornish boiler is of the order of _________________?
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A. 5-7.5 m

B. 3-5 m

C. 7-9 m

D. 2-4 m

E. 9-11 m

3373. Duplex feed pumps are used in small steam boilers. These operate on the principle of_________________?
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A. axial flow pump

B. gear pump

C. reciprocating pump

D. ejector pump

E. centrifugal pump

3374. In natural circulation type boiler _______________?
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A. feed pump is employed to supplement natural circulation in water wall type furnace

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

C. water is fed at atmospheric pressure

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

E. 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
3375. Which of the following coals has the highest calorific value_________________?
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A. wood

B. anthracite coal

C. lignite

D. peat

E. bituminous coal

3376. Hygrometery deals with the_________________?
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A. density measurement

B. pressure of air

C. temperature of air

D. water vapour in air

E. Hygroscopic substances

3377. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is_________________?
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A. one-half

B. one-fourth

C. one-third

D. two-fifth

E. one-fifth

3378. If partial pressure of air and steam be pa and ps respectively in a condenser, then according to Daltons law, the pressure in condenser is equal to__________________?
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A. Pa+P

B. Ps-Pa

C. pa-ps

D. non of these

3379. The evaporation of 15.653 kg of water per hour from and at 100C is called_________________?
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A. evaporative capacity

B. equivalent evaporation

C. factor of evaporation

D. one boiler h.p.

E. boiler efficiency

3380. A wet vapour can be completely specified by__________________?
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A. pressure only

B. specific volume only

C. dryness fraction only

D. temperature only

E. pressure and dryness fraction
3381. Adiabatic process is________________?
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A. constant enthalpy process

B. reversible process

C. non-heat transfer process

D. essentially an isentropic process

E. constant temperature process

3382. The number of flue tubes in Lancashire boiler is_________________?
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A. two

B. one

C. many

D. zero

E. four

3383. Cochran boiler is a__________________?
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A. horizontal water-tube boiler

B. forced circulating boiler

C. horizontal fire-tube boiler

D. vertical fire tube boiler

E. veritcal water-tube boiler

3384. Water tube boilers are those in which________________?
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A. none of the above

B. change in enthalpy

C. water passes through the tubes and flue gases around it

D. flue gases pass through tubes and water around it

E. work is done during adiabatic expansion
3385. One kg of steam sample contains 0.8 kg dry steam; its dryness fraction is__________________?
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A. 0.8

B. 0.2

C. 0.6

D. 1

E. 0.5

3386. Which of the following is a fire tube boiler________________?
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A. all of the above

B. Babcock and Wilcox boiler

C. locomotive boiler

D. none of the above

E. Stirling boiler.

3387. At critical point, i.e. p=225.65 kg/cm2, the latent enthalpy of vaporisation is______________?
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A. minimum

B. none of the above

C. zero

D. depends on temperature also

E. maximum

3388. 1 kg.m is equal to_________________?
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A. All Joules

B. 102 Joules

C. 9.81 Joules

D. 427 Joules

E. 539 Joules

3389. Locomotive boiler is of the following type__________________?
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A. horizontal

B. internally fired

C. multitubular

D. all of the above

E. mobile

3390. An ideal regenerative cycle is ______________________?
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A. more than carnot cycle

B. less than carnot cycle

C. could be anything

D. none of the above

E. equal to carnot cycle

3391. The equivalent evaporation of a boiler is a measure to compare _________________?
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A. the given boiler with the model

B. the two different boilers of the same make

C. two boilers of same make but operaing under different conditions

D. any type of boilers operating under any conditions

E. two different makes of boilers operating under the same operating conditions

3392. The change in internal energy in steam engines equals to__________________?
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A. work done during the rankine cycle ;

B. work done during adiabatic expansion

C. change in enthalpy

D. work done during compression.

E. none of the above

3393. Orsat meter is used for__________________?
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A. gravimetric analysis of the flue gases

B. volumetric analysis of the flue gases

C. mass flow of the flue gases

D. measuring smoke density of flue gases

E. none of the above

3394. Pick up the wrong statement about critical condition of steam___________________?
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A. all properties of liquid and steam are same

B. specific volume of steam and liquid is same

C. latent heat is zero

D. liquid directly becomes steam

E. this is the maximum pressure limit
3395. The crown of the fire box is made hemispherical in order to___________________?
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A. withstand pressure inside boiler ,

B. enable easy,manufacture

C. give maximum space

D. resist intense heat in fire box

E. give maximum strength

3396. Alkaline pyrogallate is used in Orsats apparatus for absorption of _________________?
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A. 02

B. N2

C. C02

D. none of the above

E. CO

3397. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is__________________?
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A. more

B. equal

C. less

D. may be less or more depending on temperature

E. unpredictable

3398. The state of vapour under saturation condition is described by_______________?
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A. dryness fraction alone

B. pressure alone

C. temperature alone

D. pressure and temperature

E. pressure and dryness fraction
3399. Heating of dry steam above saturation temperature is known as_____________________?
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A. enthalpy

B. latent heat

C. superheating

D. supersaturation

E. super tempering

3400. Fire tube boilers are those in which__________________?
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A. tubes are laid vertically

B. water passes through the tubes and flue gases around it

C. none of the above

D. forced circulation takes place

E. flue gases pass through tubes and water around it