Steam Engines objective questions with answers part8

Q1. The steam temperature with increase in load in case of a boiler fitted with radiation super heater
(A) increases
(B) decreases
(C) remains unaffected
(D) first increases and then decreases

Q2. During storage, the heating value of coal
(A) increases
(B) decreases
(C) remains constant
(D) may increase or decrease depending upon the method of storage

Q3. The relative heat absorption for successively added equal areas of boiler convection heating surfaces
(A) increases
(B) decreases
(C) remains unaffected
(D) first increases and then decreases

Q4. Film boiling occurs at
(A) very low pressure
(B) atmospheric pressures
(C) medium pressures
(D) very high pressures

Q5. 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

Q6. In water wall furnace, the heat is transferred to the water-walls by
(A) convection
(B) radiation
(C) conduction
(D) radiation and conduction

Q7. 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

Q8. 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

Q9. 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 steam parameters
(D) All of these

Q10. The basic job of feed water treatment in boilers is to overcome the problem of
(A) corrosion
(B) scale
(C) carryover
(D) All of these

Q11. In forced circulation type boiler
(A) heating takes place at bottom and the water supplied at bottom gets converted into the mixture of steam bubbles and hot water which rise to drum
(B) water is supplied in drum and through down-comers located in atmospheric condition it passes to the water wall and rises to drum in the form of mixture of water and steam
(C) feed pump is employed to supplement natural circulation in water wall type furnace
(D) water is converted into steam in one pass without any recirculation

Q12. Boiler stays are used to
(A) prevent flat surfaces under pressure from tearing apart
(B) take care of failure in shear
(C) take care of failure in compression
(D) provide support for boiler

Q13. The radius of a dished head is taken approximately as
(A) one-fourth
(B) half
(C) one
(D) two

Q14. Size of boiler tubes is specified by
(A) mean diameter and thickness
(B) inside diameter and thickness
(C) outside diameter and thickness
(D) outside diameter and inside diameter

Q15. 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) All of these

Q16. The major axis of elliptical manholes on the shell should be provided
(A) longitudinally
(B) circumferentially
(C) on dished end
(D) anywhere

Q17. 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

Q18. With increase in load, radiant superheater has
(A) drooping characteristic
(B) lihear characterisstic
(C) rising characteristic
(D) flat characteristic

Q19. With increase in load, convection superheater has
(A) drooping characteristic
(B) linear characterisstic
(C) rising characteristic
(D) flat characteristic

Q20. The diameter of fire tubes in Cochran boiler is of the order of
(A) 2 cm
(B) 6 Cm
(C) 8 cm
(D) 12 cm