Hard coke is used in________________?

Related Mcqs:

1. Coke is produced by__________________?

   A. pulverising coal in inert atmosphere
   B. heating wood in a limited supply of air at temperatures below 300GC
   C. strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
   D. binding the pulverised coal into brick-etts
   E. enriching carbon in the coal

2. Hard coke is produced by carborisation of coal at_______________?

   A. atmospheric temperature
   B. 500-600°C
   C. 70O-850°C
   D. 95O-1100°C
   E. 120O-1500°C

3. 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
   E. none of the above

4. Locomotive boiler is of the following type__________________?

   A. multitubular
   B. horizontal
   C. internally fired
   D. mobile
   E. all of the above

5. The pressure at which latent heat of vaporisation of water is zero, is_________________?

   A. below atmospheric pressure
   B. 1 kg/cm2
   C. 100 kg/cm2
   D. 170 kg/cm2
   E. 225.6 kg/cm2

6. The pressure of reheat steam after passing through reheater compared to inlet condition is _________________?

   A. more
   B. less
   C. equal
   D. may be more or less depending on capacity of reheater
   E. none of the above

7. Secondary air is the 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 induced draft fan
   E. air fed to pulverisers

8. 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
   E. none of the above

9. Feed water conditioning in thermal power plants in done to__________________?

   A. reduce hardness and for removal of solids
   B. increase efficiency-of thermal power plant
   C. increase *heat transfer rate
   D. increase steam parameters
   E. all of the above

10. Which device is used in thermal power plants to reduce level of pollution___________________?

    A. induced draft fan
    B. smoke meter
    C. chimney
    D. precipitator
    E. pulveriser