Steam Boilers and Engines MCQs Archives

31. In cross compounding, the cylinders are arranged

side by side and each cylinder has common piston, connecting rod and crank

side by side and each cylinder has separate piston, connecting rod and crank

at 90° and each cylinder has common piston, connecting rod and crank

at 90° and each cylind

✅ The correct answer is option B.

32. The ratio of the actual vacuum to the ideal vacuum in a condenser is called

condenser efficiency

vacuum efficiency

nozzle efficiency

boiler efficiency

✅ The correct answer is option B.

33. The number of fire tubes in a Cochran boiler are

115

165

225

✅ The correct answer is option C.

34. The velocity of flue gases (V) through the chimney under a static draught of(H’) metres is given by

V = 2g H’

V = 2g/H’

V = H’/2g

V = 2gH’

✅ The correct answer is option A.

35. When steam after doing work in the cylinder passes into a condenser, the engine is said to be a

slow speed engine

vertical steam engine

condensing steam engine

non-condensing steam e

✅ The correct answer is option C.

36. In a Woolf type compound engine, the high pressure and low pressure cylinders

have common piston rod

are set at 90°

have separate piston rod

are set in V – arrange

✅ The correct answer is option C.

37. The diameter of internal flue tubes of a Lancashire boiler is about __________ that of its shell.

one-fourth

one-third

two-fifth

one-half

✅ The correct answer is option C.

38. In a boiler, the heat is lost

to dry flue gases

in moisture present in the fuel

to steam formed by combustion of hydrogen per kg of fuel

all of the above

✅ The correct answer is option D.

39. Which of the following statement indicates the difference between Cornish boiler and Lancashire boiler ?

Cornish boiler is a water tube boiler whereas Lancashire boiler is a fire tube boiler.

Cornish boiler is a fire tube boiler whereas Lancashire boiler is a water tube boiler.

Cornish boiler has one flue tube whereas Lancashire boiler has two flue tubes.

Cornish boiler has two

✅ The correct answer is option C.

40. A compound steam engine in which piston rods of high pressure and low pressure cylinders are attached to two different cranks set at 90° to each other, is called

receiver type compound engine

Tandem type compound engine

Woolf type compound engine

both (a) and (b)

✅ The correct answer is option A.