Practice Test: Question Set - 18
1. Latent heat of dry steam at atmospheric pressure is equal to
- (A) 539 kcal/ kg
- (B) 539 BTU/ lb
- (C) 427 kcal/ kg
- (D) 100 kcal/ kg
2. The ratio of total useful heat drop to the total isentropic heat drop, is called
- (A) Stage
efficiency
- (B) Internal
efficiency
- (C) Rankine
efficiency
- (D) None
of these
3. The pressure of feed water has to be raised before its entry into the boiler. The pressure is raised by a device known as
- (A) Feed pump
- (B) Injector
- (C) Feed
check valve
- (D) Pressure
gauge
4. For burning 1 kg of carbon to CO as per chemically correct combustion, amount of air required is
- (A) 1 kg
- (B) 4/3 kg
- (C) 8/3 kg
- (D) 2 kg
5. A binary vapor plant consists of
- (A) Steam
turbine
- (B) Steam
condenser
- (C) Mercury
boiler
- (D) All
of these
6. The draught may be produced by a
- (A) Mechanical
fan
- (B) Chimney
- (C) A steam jet
- (D) All of these
7. Which of the following is steam dial?
- (A) Non-coking bituminous
coal
- (B) Brown coal
- (C) Pulverized coal
- (D) Coking bituminous
coal
8. The maximum efficiency of a reaction turbine is
- (A) 2 sin²α/(1 + sin²α)
- (B) 2 cos²α/(1 + cos²α)
- (C) (1 +
sin²α)/2 sin²α
- (D) (1 +
cos²α)/2 cos²α
9. In order to compare the capacity of boilers, the feed water temperature and working pressure are taken as
- (A) 50°C and
normal atmospheric pressure
- (B) 50°C and 1.1
bar pressure
- (C) 100°C and
normal atmospheric pressure
- (D) 100°C and
1.1 bar pressure
10. In accelerated 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
11. The pressure of steam __________ while flowing through a nozzle.
- (A) Increases
- (B) Decreases
- (C) Remains
constant
- (D) None of
these
12. The indicated thermal efficiency is defined as the
- (A) Ratio
of thermal efficiency to the Rankine efficiency
- (B) Ratio
of brake power to the indicated power
- (C) Ratio
of heat equivalent to indicated power to the energy supplied in steam
- (D) Product
of thermal efficiency and Rankine efficiency
13. The major axis of elliptical manholes on the shell should be provided
- (A) Longitudinally
- (B) Circumferentially
- (C) On dished end
- (D) Anywhere
14. In a reaction turbine, when steam flows through the moving blades,
- (A) Pressure
increases while velocity decreases
- (B) Pressure
decreases while velocity increases
- (C) Pressure
and velocity both decreases
- (D) Pressure
and velocity both increases
15. The device attached to the steam chest for preventing explosions due to excessive internal pressure of steam is called
- (A) Safety valve
- (B) Water
level indicator
- (C) Pressure
gauge
- (D) Fusible plug