Practice Test: Question Set - 21
1. Pour point of fuel oil is the
- (A) Lowest temperature at
which oil will flow under set condition
- (B) Storage temperature
- (C) Temperature at which
fuel is pumped through burners
- (D) Temperature at which
oil is transported
2. The steam leaves the nozzle at a
- (A) High
pressure and a low velocity
- (B) High
pressure and a high velocity
- (C) Low
pressure and a low velocity
- (D) Low
pressure and a high velocity
3. A condenser where circulating water flows through tubes which are surrounded by steam, in known as
- (A) Surface
condenser
- (B) Jet
condenser
- (C) Barometric
condenser
- (D) Evaporative
condenser
4. Maximum energy loss in a boiler occurs due to
- (A) Unburnt carbon in ash
- (B) Incomplete combustion
- (C) Ash content
- (D) Flue gases
5. The friction in the nozzle __________ exit velocity of steam.
- (A) Has
no effect on
- (B) Decreases
- (C) Increases
- (D) None
of these
6. The function of an eccentric rod is
- (A) To
provide reciprocating motion to the slide valve
- (B) To
convert reciprocating motion of the piston into rotary motion of the crank
- (C) To
convert rotary motion of the crankshaft into to and fro motion of the valve rod
- (D) To
provide simple harmonic motion to the D-slide valve
7. In water wall furnace, the heat is transferred to the water walls by
- (A) Convection
- (B) Radiation
- (C) Conduction
- (D) Radiation and
conduction
8. The efficiency of reaction turbine is maximum when (where α = Angle made by the absolute velocity ‘V’ at inlet)
- (A) Vb
= 0.5 V cosα
- (B) Vb
= V cos α
- (C) Vb
= 0.5 V² cosα
- (D) Vb
= V²
cos α
9. When the speed of the crankshaft is between 100 r.p.m. and 250 r.p.m., the engine said to be a
- (A) Slow
speed engine
- (B) Medium
speed steam engine
- (C) High
speed steam engine
- (D) None
of these
10. The latent heat of steam at pressures greater than atmospheric in comparison to latent heat at atmospheric pressure is
- (A) Less
- (B) More
- (C) Equal
- (D) May be less or more
depending on temperature
11. The efficiency of steam turbines may be improved by
- (A) Reheating
of steam
- (B) Regenerative
feed heating
- (C) Binary vapor plant
- (D) Any
one of these
12. In a uniflow engine
- (A) Steam
enters and exhausts through the same port
- (B) Steam
enters at one end and exhausts at the centre
- (C) Steam
enters at the centre and exhausts at the other end
- (D) None
of the above
13. In an experiment to determine dryness fraction of steam, the mass of water separated was 1.2 kg in 15 mts. and the mass of steam passed out in same time was 4.8 kg. Dryness fraction is
- (A) 40 %
- (B) 25 %
- (C) 50 %
- (D) 80 %
14. The critical pressure ratio is given by (where p₁ = Initial pressure of steam, and p₂ = Pressure of steam at throat or critical pressure)
- (A) p₁. p₂
- (B) p₁/p₂
- (C) p₂/p₁
- (D) p₁ + p₂
15. Which of the following is a water tube boiler?
- (A) Lancashire
boiler
- (B) Babcock
and Wilcox boiler
- (C) Locomotive
boiler
- (D) Cochran
boiler