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This set of Thermal Engineering 2 Multiple Choice Questions & Answers (MCQs) focuses on Thermal Engineering II Set 17
Q1 | What is the steam pressure limit of natural circulation boilers?
- 650bar
- 180bar
- 400bar
- 550bar
Q2 | Which type of boilers use orifice to control the flow circulation?
- natural circulation boilers
- forced convection boilers
- once-through boilers
- positive forced circulation boilers
Q3 | Which of the given boilers operate above critical pressure?
- natural circulation boilers
- forced circulation boilers
- once-through boilers
- water tube boilers
Q4 | Which type of boilers are called drum-less boilers?
- natural circulation boilers
- fire tube boilers
- positive forced circulation boiler
- forced circulation boiler
Q5 | What is the advantage of having smaller ratio of water to steam space?
- steam can be generated at a faster even if the boiler is cold
- increases the rate of evaporation
- water is made cyclic, i.e., from boiler drum to water tube and back to drum
- helps in mobilizing the boiler
Q6 | Chances of sediments depositing inside the water tubes in the shell is less due to?
- low working pressure
- natural circulation of water
- partial circulation of water
- high working pressure
Q7 | Out of the given option choose the advantage that supports fire tube boilers?
- water circulation is cyclic
- used as a mobile boiler
- water circulation is limited inside boiler shell
- bursting of flue tube does not cause any explosion
Q8 | Which are the major types of boilers that are operated in world today?
- natural circulation boiler
- forced circulation boiler
- fire tube boiler
- once through boiler
Q9 | How many level indicators are there in the water level indicator of a boiler?
- 1
- 2
- 3
- 4
Q10 | What is the function of pressure gauge in the boiler?
- to indicate steam pressure
- to indicate water pressure
- to indicate air pressure
- to indicate flue gas pressure
Q11 | other than Steam stop valve in the boiler which is the other similar type of valve used?
- non-reversible valve
- transient valve
- reversible valve
- junction valve
Q12 | What is the function of Blow down valve of a boiler?
- to remove sludge
- to build sediments
- to remove flue gas
- to remove ash
Q13 | What is the function of fusible plug in the boiler?
- protect the fire tube
- to trip on overload
- to act as a junction switch
- to maintain pressure
Q14 | What is the function of safety valves in the boiler?
- to prevent excessive steam pressure
- to prevent excessive air pressure
- to prevent water pressure
- to prevent from rising temperatures
Q15 | How many types of safety valves are used in boiler in practice?
- 1
- 2
- 3
- 4
Q16 | What happens due to high temperature of feeds water in the economizer?
- fuel consumption increases
- fuel mechanical efficiency increases
- fuel consumption decreases
- fuel mechanical efficiency decreases
Q17 | What is the function of superheater in the boiler?
- increase the temperature of steam
- reheat the steam
- superheat the feed water
- to heat the fuel gas
Q18 | What is the function Air heater in the boiler?
- preheat the air before entering the boiler
- recover the heat from flue gas
- heating of economizer tubes
- reheat the gas coming out of economizer
Q19 | Tubular air preheater of a boiler is also called as
- recuperative air preheater
- elliptical air preheater
- ovoid air preheater
- squarish air preheater
Q20 | What does regenerative air preheater consists of?
- rotor
- skewers
- propeller
- piston
Q21 | What is the function of the feed water pump of a boiler?
- pump water at high pressure
- to pump water at lower pressure
- to pull back the water from boiler
- to convert steam into water after the boiler process
Q22 | Rotary pumps are driven by
- electric motors
- batteries
- diesel engines
- biogas fuel
Q23 | Which fuel is prepared by heating bituminous coal continuously for 15 to 18 hours in closed chamber?
- charcoal
- anthracite
- coke
- briquette coal
Q24 | Which fuel is prepared by moulding finely ground coal under pressure?
- coke
- charcoal
- briquette coal
- lignite
Q25 | Which fuel is produced by powdering low grade coal with high ash content?
- coke
- pulverized coal
- charcoal
- briquette coal