For the same diameter and thickness of tube, a water tube boiler compared to a fire tube boiler has ____________________?
(A) more heating surface
(B) less heating surface
(C) equal heating surface
(D) heating surface depends on other parameters
(D) none of the above
The size of a boiler drum in pulverised fuel fired boiler,as its size and capacity, (steam pressure and flow ratings) increase __________________?
(A) increases
(B) decreases
(C) remains unchanged
(D) increases/decreases depending on steam temperature requirements
(D) unpredictable
The basic job of feed water treatment in boilers is to overcome the problem of __________________?
(A) corrosion
(B) scale
(C) carryover
(D) embrittlement
(D) all of the above
The feed check valve is used in order to ______________________?
(A) regulate flow of boiler water
(B) check level of water in boiler drum
(C) recirculate unwanted feed water
(D) allow high pressure feed water to flow to drum and not allow reverse flow to take place
(D) none of the above
In water wall furnace, the heat is transferred to the water-walls by _________________?
(A) convection
(B) radiation
(C) conduction
(D) radiation and conducton
(D) radiation and convection
The proximate analysis of fuel lists__________________?
(A) various chemical constituents, carbon, hydrogen, oxygen etc, plus ash as per-cents by volume
(B) various chemical constituents, carbon, hydrogen, oxygen, etc, plus ash as per-cents by weight
(C) fuel constituents as percents by volume of moisture, volatile, fixed carbon and ash
(D) fuel constituents as percents by weight of moisture, volatile, fixed carbon and ash
(D) moisture and ash free heating value
The safety valve on boiler drum compared to safety valve on super heater is set at ________________?
(A) same value
(B) higher value
(C) lower value
(D) lower/higher depending on steam flow
(D) unpredicatble
The three “Ts” for good combustion are____________________?
(A) temperature, time, and turbulance
(B) total air, true fuel, and turbulance
(C) thorough mixing, total air, and temperature
(D) total air, time, and temperature
(D) none of the above
Gardually increasing temperature of flue gases at inlet to chimney for given steam outputs is an indication of__________________?
(A) higher effectiveness of boiler
(B) high calorific value coal being burnt
(C) fouling of heat transfer surfaces
(D) raising of steam temperature
(D) leakage of air
The capacity of induced draft fan compared to forced draft fan in a boiler is__________________?
(A) same
(B) more
(C) less
(D) less or more depending on size of boiler
(D) unpredictable