The ratio of heat utilised to produce steam and the heat liberated in furnace is known as___________________?

Related Mcqs:

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

   A. less
   B. more
   C. equal
   D. may be less or more depending on temperature
   E. unpredictable

2. One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is__________________?

   A. 0.2
   B. 0.8
   C. 1.0
   D. 0.6
   E. 0.5

3. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is__________________?

   A. 40%
   B. 25%
   C. 50%
   D. 80%
   E. 90%

4. Expanding steam to a very low pressure (high vacuum) in steam engines is _________________?

   A. desirable
   B. economical
   C. essential
   D. optional
   E. uneconomical

5. Vacuum for reciprocating steam engines compared to steam turbines is__________________?

   A. more
   B. equal
   C. less
   D. could be more or less depending on the size of plant
   E. none of the above

6. In ordetjo obtain superheated steam, a superheater is added in an existing boiler. As as result, furnace vacuum will _________________?

   A. remain unaffected
   B. improve C. worsen
   C. may improve/worsen depending on size
   D. unpredictable

7. In which of the following boilers, the draught in furnace is increased by utilising exhaust steam from engine__________________?

   A. lancashire boiler
   B. locomotive boiler
   C. babcock and wilcox boiler
   D. cochran boiler
   E. benson boiler

8. It is required to produce large amount of steam at low pressure. Which boiler should be used ?

   A. pulverised fuel fired boiler
   B. cochran boiler
   C. lancashire boiler
   D. babcock and wilcox boiler
   E. stoker fired boiler

9. The thermal efficiency of a semi-diesel cycle having fixed compression ratio and fixed quantity of heat, with increase in pressure ratio will_______________?

   A. increase
   B. decrease
   C. remain unaffected
   D. increase/decrease depending upon engine capacity
   E. first increase and then decrease

10. Latent heat of dry steam at atmospneric pressure is equal to____________________?

    A. 539 kcal/kg
    B. 539 BTU/lb
    C. 427 kcal/kg
    D. 100 kcal/kg
    E. 471 kcal/kg