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

Related Mcqs:

1. 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

2. 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

3. Diesel engines as compared to petrol engines require ______________________?

   A. bigger flywheel
   B. smaller flywheel
   C. same size flywheel
   D. no flywheel
   E. flywheel whose size may be less or more depending on several other fac-tors

4. The high pressure boiler is oiie producing steam at a pressure more than_________________?

   A. atmospheric pressure
   B. 5 kg/cm2
   C. 10 kg/cm2
   D. 40 kg/cm2
   E. 75-80 kg/cm2

5. The change in internal energy in steam engines equals to__________________?

   A. work done during the rankine cycle ;
   B. work done during compression.
   C. work done during adiabatic expansion
   D. change in enthalpy
   E. none of the above

6. The dry saturated steam at very low pressure, (5-10 kg/cm2) when throttled to atmosphere will become________________?

   A. wet
   B. superheated
   C. remain dry satruated
   D. dry
   E. none of the above

7. 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

8. 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

9. Diesel engines have low specific fuel consumption compared to petrol engine. This statement is____________________?

   A. not true
   B. true at full load
   C. true at part load
   D. true at both part and full load
   E. there could not be any such criterion

10. For low speed operation or for idling in petrol engines, the engine requirements are for_______________?

    A. lean mixture
    B. theoretically correct mixture
    C. rich mixture
    D. any type of mixture
    E. lean/rich mixture depending upon capacity of engine