Q1. The diameter of internal flue tubes in a Lancashire boiler compared to its shell is
Q2. The basic purpose of drum in boiler is to
(a) serve as storage of steam
(b) serve as storage of feed water for water wall
(c) remove salts from water
(d) separate steam from water
(e) control level.
Q3. Duplex feed pumps are used in small steam boilers. These operate on the principle of
(a) centrifugal pump
(b) axial flow pump
(c) gear pump
(d) ejector pump
(e) reciprocating pump.
Q4. The best suited coal for chain or travelling grate stoker boiler is
(a) coking coal
(b) non coking or free burning coal
(c) pulverised coal
(d) high sulphur coal
(e) least ash content coal.
Q5. In natural 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 durm and through down-comers located in atmospheric conditon 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
(e) water is fed at atmospheric pressure.
Q6. Hard coke is produced by carborisation of coal at
(a) atmospheric temperature
Q7. Hard coke is used in
(a) cement industry
(b) thermal power plant
(c) blast furnace
(d) domestic use
Q8. 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.
Q9. 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.
Q10. Locomotive boiler is of the following type
(c) internally fired
(e) all of the above