A. approach temperature should be as low as possible
B. handling and maintenance should be easier
C. heat transfer area should be optimum
D. stack gases should not be cooled to the dew point
E. none of the above
Related Mcqs:
- In regenerative air preheater, the heat is transferred _____________________?
A. from a metal wall from one medium to another
B. from heating an intermediateanaterial and then heating the air from this material
C. by direct mixing
D. heat is transferred by bleeding some gas from furnace
E. none of the above - In a recuperative air preheater, the heat is transferred____________________?
A. from a metal wall from one medium to another
B. from heating an itermediate material and then heating the air from this material
C. by direct mixing ,
D. heat is transferred by bleeding some gases from furnace
E. none of the above - The difference between cornish boiler and lancashire boiler is that_________________?
A. former is fire tube type and latter is water tube type boiler
B. former is water tube type and latter is fire tube type
C. former contains one fire tube and latter contains two fire tubes
E. none/of the above - One of the basic essentials of an incentive plan is that_________________?
A. a differential piece rate system should exist
B. minimum wages should be guaranteed
C. provide incentive to group efficiency performance
D. all standards should be based on optimum standards of production
E. all standards should be based on time studies - In which of the following cases, consideration of creep is important_________________?
A. flywheel of steam engine
B. cast iron pipes”
C. cycle chains
D. gas turbine blades
E. piston I.C. engine - Primary air is the air used to__________________?
A. provide air around burners for obtaining optimum combustion
B. transport and dry the coal
C. convert CO (formed in lower zone of furnace) into C02 at higher zone
D. air-delivered by forced draft fan
E. none ot the above - Tertiary air is the air used to____________________?
A. provide air around burners for obtaining optimum combustion
B. transport and dry the coal
C. cool the scanners
D. supply air for ignitors
E. convert CO (formed in lower zone of furnace) into C02 at higher zone - Free air is the air at________________?
A. atmospheric conditions at any specific location
B. 20°C and 1 kg/cm2 and relative humidity of 36%
C. 0°C and standard atmospheric conditions
D. 15°C and 1 kg/cm2
E. 25°C, 1 kg/cm2 and relative humidity of 50%. - Auto-ignition reaction time for petrol engine first decreases with increase in fuel air ratio, reaches a minimum value and then increases with subsequent increase in fuel air ratio. The minimum value occurs in the region of________________?
A. Lean mixture
B. Chemically correct fuel air ratio
C. Rich mixture
D. Unpredictable - 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
A. 90 lbf
B. 65.78 lbf
C. 0.00989 lbf
D. 3.00989 lbfSubmitted by: Faheem Zaman Dhaunroo
