Steam Engines objective questions with answers part2

Q1. linearly
(A) slowly first and then rapidly
(B) rapidly first and then slowly
(C) inversely
(D) The equivalent evaporation of a boiler is a measure to compare

Q2. the given boiler with the model
(A) the two different boilers of the same make
(B) two boilers of same make but operaing under different conditions
(C) any type of boilers operating under any conditions
(D) The coal requirement per kW hour generation in the thermal power plant is of the order of

Q3. Sublimation region is the region where
(A) 0.2 to 0.4 kg
(B) 0.6 to 0.8 kg
(C) 1.0 to 1.5 kg
(D) 0.1 to 0.2 kg

Q4. solid and vapour phases are in equilibrium
(A) solid and liquid phases are in equilibrium
(B) liquid and vapour phases are in equilibrium
(C) solid, liquid and vapour phases are in equilibrium
(D) Stoichiometric quantity of air is the

Q5. air present in atmosphere at NTP conditions
(A) air required for complete combustion of fuel with no excess air
(B) air required for optimum combustion so as to have reasonable excess air
(C) air required to convert CO into C02
(D) One kg of steam sample contains 0.8 kg dry steam; it’s dryness fraction is

Q6. 0.2
(A) 0.8
(B) 1.2
(C) 0.6
(D) 0

Q7. If a steam sample is nearly in dry condition, then its dryness fraction can be most accurately determined by
(A) throttling calorimeter
(B) separating calorimeter
(C) combined separating and throttling calorimeter
(D) bucket calorimeter

Q8. The specific heat of superheated steam in kcal/kg is generally of the order of
(A) 0.12
(B) 0.3
(C) 0.5
(D) 0.8

Q9. On Mollier chart, flow through turbine is represented by ‘
(A) horizontal straight line
(B) vertical straight line
(C) straight inclined line
(D) curved line

Q10. A wet vapour can be completely specified by
(A) pressure only
(B) temperature only
(C) dryness fraction only
(D) pressure and dryness fraction

Q11. On Millier chart, the constant pressure lines
(A) diverge from left to right
(B) diverge from right to left
(C) are equally spaced throughout
(D) first rise up and then fall

Q12. On Mollier chart, free expansion, or throttling process from high pressure to atmosphere is represented by
(A) horizontal straight line
(B) vertical straight line
(C) straight inclined line
(D) curved line

Q13. The bituminous coal is non-caking if its carbon content is
(A) 78-81%
(B) 81-85%
(C) 85-90%
(D) 90-95%

Q14. 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 saturated
(D) dry

Q15. Water at pressure of 4 kg/cm2 and 160°C temperature when exposed to atmosphere will
(A) boil
(B) flash i.e. get converted into steam
(C) remain as it was
(D) cool down

Q16. The dry saturated steam at very high pressure (150-200 kg/cm2) when throttled to atmosphere will become
(A) wet
(B) superheated
(C) remain dry saturated
(D) dry

Q17. In a throttling process
(A) steam temperature remaisn constant
(B) steam pressure remains constant
(C) steam enthalpy remains constant
(D) steam entropy remains constant

Q18. a throttling process
(A) heat transfer takes place
(B) work is done by the expanding steam
(C) internal energy of steam changes
(D) None of these

Q19. Latent heat of dry steam at atmospneric pressure is equal to
(A) 539 kcal/kg
(B) 539 BTU/lb
(C) 417 kcal/kg
(D) 100 kcal/kg

Q20. The latent heat of steam with increase of pressure
(A) remains same
(B) increases
(C) decreases
(D) behaves unpredictably