Fast & high
Slow & low
Slow & high
Fast & slow
✅ The correct answer is option A.
Engineering
Boost your preparation with the latest Engineering MCQs with answers and explanations. Our collection covers civil engineering, electrical engineering, mechanical engineering, electronics, software engineering, and other core subjects. These multiple-choice questions are designed for students, competitive exam aspirants, and professionals preparing for NTS, PPSC, FPSC, CSS, PMS, PEC exams, university entry tests, and job interviews. Practice online with updated Engineering MCQs to strengthen concepts, improve technical knowledge, and perform better in exams and recruitment tests.
3172. Moisture loss is determined by the
Humidity of combustion air
Moisture content of fuel
Both A and B
The water formed by combustion reaction
✅ The correct answer is option C.
3173. With increase in C/H ratio of a fuel, the dew point of flue gases
Increases
Decreases
Remains same
May increase or decrease ; depends on the type of fuel
✅ The correct answer is option B.
3174. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm³ /ton of dry coal.
60
160
500
750
✅ The correct answer is option B.
3175. When incomplete combustion loss is high, the flue gas analysis shows large amount of
CO₂
CO
O₂
C
✅ The correct answer is option B.
3176. Which of the following is the most important deterrents to an extended use of pulverised coal in boiler firing?
Ash disposal problem
Excessive fly-ash discharge from the stack
High power consumption in its transportation
Erosion of induced draft fan blades
✅ The correct answer is option A.
3177. Turndown ratio of a gas burner is equal to the
Maximum to minimum heat input ratio
Maximum to minimum permissible gas flow rate
Both A & B
Minimum to maximum heat input ratio
✅ The correct answer is option C.
3178. Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in
Air
Oxygen
Either A or B
Either A or C without gain or loss of heat
✅ The correct answer is option D.
3179. __________ of carbon blocks in the hearth of blast furnace helps in avoiding skull formation, when it becomes cold.
High thermal conductivity
Low porosity
Non-wetting characteristics
High density
✅ The correct answer is option C.
3180. Chromite refractories are used in
bottom of soaking pits.
between acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other.
both (a) & (b)
neither (a) and (b)
✅ The correct answer is option C.