Questions and answers for exam Preparation

MCQs

Total Questions : 1935 | Page 189 of 194 pages

Question 1881. Maximum energy loss in a boiler occurs due to _______________________?

unburnt carbon in ash
incomplete combustion
ash content
flue gases
radiation losses

Discuss Question

Answer: Option D. -> flue gases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1882. A supercritical boiler is one that operates above the pressure and temperature of following values_____________________?

100 kg/cm2 and 540°C
1 kg/cm2 and 100°C
218 kg/cm2 abs and 373°C
218 kg/cm2 abs and 540°C
100 kg/cm2 abs and 373°C

Discuss Question

Answer: Option C. -> 218 kg/cm2 abs and 373°C
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1883. Fire tube boilers are limited to a maximum design working pressure of ____________________?

1 kg/cm
6 kg/cm
17 kg/cm2
100 kg/cm2
250 kg/cm2

Discuss Question

Answer: Option C. -> 17 kg/cm2
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1884. The steam temperature with increase in load in case of a boiler fitted with radiation super heater________________?

increases
decreases
remains unaffected
first increases and then decreases
unpredictable

Discuss Question

Answer: Option B. -> decreases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1885. The relative heat absorption for successively added equal areas of boiler convection heating surfaces____________________?

increases
decreases
remains unaffected
first increases and then decreases
first decreases and then increases

Discuss Question

Answer: Option B. -> decreases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1886. Film boling occurs at _______________________?

very low pressure
atmospheric pressures
medium pressures
very high pressures
none of the above

Discuss Question

Answer: Option D. -> very high pressures
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1887. The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?

increases
decreases
remains unchanged
increases/decreases depending on steam temperature requirements
unpredictable

Discuss Question

Answer: Option B. -> decreases
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1888. The feed check valve is used in order to ______________________?

regulate flow of boiler water
check level of water in boiler drum
recirculate unwanted feed water
allow high pressure feed water to flow to drum and not allow reverse flow to take place
none of the above

Discuss Question

Answer: Option D. -> allow high pressure feed water to flow to drum and not allow reverse flow to take place
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 1889. In water wall furnace, the heat is transferred to the water-walls by _________________?