Choose the correct answer from the following:
(a) The water tubes in a Babcock and Wilcox boiler are
(i) vertical
(ii) horizontal
(iii) inclined
(iv) none of the above
(b) The draught produced in locomotives is
(i) induced
(ii) forced
(iii) both
(iv) none of the above
(c) An economiser in a boiler
(i) increases thermal efficiency
(ii) increases fuel consumption
(iii) expands steam
(iv) none of the above
(d) The condition of steam in the boiler drum is usually
(i) superheated
(ii) super saturated
(iii) wet
(iv) none
(e) In an impulse turbine, when steam flows through the moving blades,
(i) velocity decreases
(ii) velocity increases
(iii) pressure decreases
(iv) pressure increases
(f) De-Laval turbine is a
(i) simple impulse turbine
(ii) simple reaction turbine
(iii) pressure-compounded turbine
(iv) velocity-compounded turbine
(g) In reaction turbine, when steam flows through the fixed blades,
(i) pressure and velocity both increase
(ii) pressure and velocity both decrease
(iii) pressure decreases, while velocity increases
(iv) pressure decreases, while velocity decreases
(h) In pressure compounded impulse turbine
(i) pressure drop for each stage is equal
(ii) pressure drop takes place in nozzle
(iii) both (i) and (ii)
(iv) none of the above
(i) In velocity compounded impulse turbine, when steam flows through the second row of moving blades,
(i) velocity increases
(ii) velocity decreases
(iii) velocity remains constant
(j) In steam turbines, blades are
(i) straight
(ii) curved
(iii) circular
(iv) none of the above