Maximum energy loss in a boiler occurs due to _______________________?

Related Mcqs:

1. Pick up the correct statement as regards Cornish boiler and Lancashire boiler _______________?

   A. cornish is fire tube and lancashire is water tube
   B. cornish is water tube and lancashire is fire tube
   C. cornish has two fire tubes and lancashire has one
   D. lancashire has two fire tubes and cornish has one
   E. both have two fire tubes

2. 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

3. 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
   E. unpredictable

4. 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
   E. none of the above

5. The heat loss in a boiler takes place in the form of________________?

   A. heat carried away by flue gases
   B. heat carried away by ash
   C. moisture present in fuel and steam formed by combustion of hydrogen in fuel
   D. radiation
   E. all of the above

6. Film boling occurs at _______________________?

   A. very low pressure
   B. atmospheric pressures
   C. medium pressures
   D. very high pressures
   E. none of the above

7. In locomotive boiler, maximum steam pressure is limited to_______________?

   A. 1 kg/cm2
   B. 5 kg/cm2
   C. 10 kg/cm2
   D. 18 kg/cm2
   E. 31 kg/cm2

8. The maximum discharge through a chimney occurs when the height of chimney is_____________________?

   A. infinitely long
   B. around 200 meters
   C. equal to the height of the hot gas column producing draught
   D. outside temperature is very low
   E. more than the tallest building nearby

9. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as________________?

   A. hysteresis
   B. creep
   C. visco elasticity
   D. Boeschinger effect
   E. inelasticity

10. According to Recardo’s theory, detonation occurs due to______________________?

    A. instantaneous auto-ignition of last part of charge to be burnt
    B. improper mixing of air and fuel
    C. improper combustion
    D. self ignition temperature has nothing to do with detonation
    E. none of the above