Description : Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm3 . (A) 30 (B) 300 (C) 3,000 (D) 30,000
Last Answer : (B) 300
Description : Function of secondary air in pulverised coal firing is to (A) Transport the coal to the burner (B) Dry the coal (C) Ensure efficient burning of coal around the burner (D) Reduce primary air requirement
Last Answer : (C) Ensure efficient burning of coal around the burner
Description : Calorific value of gobar gas (containing CH4 = 60% , H2 = 10% ; CO2 = 30%) may be about __________ Kcal/Nm3 . (A) 1,800 (B) 3,200 (C) 5,400 (D) 10,200
Last Answer : (C) 5,400
Description : Smoke point of a good burning kerosene may be around __________ mm. (A) 0-5 (B) 20-25 (C) 60-75 (D) 100-120
Last Answer : (B) 20-25
Description : About __________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO. (A) 2 (B) 3 (C) 4 (D) 5
Last Answer : (D) 5
Description : The main function of primary air in pulverised coal fired burner is to (A) Burn CO to CO2 (B) Dry and transport the coal (C) Have proper combustion by supplying it around the burner (D) Preheat the tertiary air used for complete combustion of CO to CO2
Last Answer : (B) Dry and transport the coal
Description : The fluid jet discharging from a 2" diameter orifice has a diameter of 1.75" at its vena-contracta. The co-efficient of contraction is (A) 1.3 (B) 0.766 (C) 0.87 (D) None of these
Last Answer : (B) 0.766
Description : Dry air required to burn 1 kg of carbon completely may be around __________ kg. (A) 11 (B) 2 (C) 20 (D) 38
Last Answer : (A) 11
Description : Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal. (A) 60 (B) 160 (C) 500 (D) 750
Last Answer : (B) 160
Description : A sample of natural gas containing 80% methane (CH4 ) and rest nitrogen (N2 ) is burnt with 20% excess air. With 80% of the combustibles producing CO2 and the remainder going to CO, the Orsat analysis in volume percent is (A) CO2 : 6 ... 96, N2 :72.06 (D) CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74
Last Answer : (B) CO2 : 7.42, CO : 1.86, O2 : 4.64, N2 :86.02
Description : Pick out the wrong statement. (A) The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are the same for NSc = NPr= 1 (B) 1 Nm3 of dry air is lighter ... ) The Lewis number of a mixture is unity, when the thermal diffusivity is equal to the mass diffusivity
Last Answer : (B) 1 Nm3 of dry air is lighter than 1Nm3 of humid air
Description : The calorific value of producer gas is around __________ kcal/Nm3 . (A) 1300 (B) 500 (C) 4500 (D) 9000
Last Answer : (A) 1300
Description : Calorific value of coke oven gas is around __________ Kcal/Nm3 . (A) 900 (B) 4200 (C) 7500 (D) 2000
Last Answer : (B) 4200
Description : Calorific value of blast furnace gas is around __________ KCal/Nm3 . (A) 850 (B) 1800 (C) 4200 (D) 6500
Last Answer : (A) 850
Description : What is the value of a Forehand Arms CO 6 shot revolver. Serial number 386615. Patented Dec 7 86 and Jany 11 87?
Last Answer : The value of ANY gun is based on the exact MAKE, MODEL and CONDITION. We need all 3 factors. and you gave us 1 factor- the make. Forehand has been out of business since 1906. You will need a hands on evaluation. Sorry.
Description : C.V. (kcal/Nm3 ) of gaseous fuels __________ with increase in molecular weight. (A) Decreases (B) Increases (C) Remain constant (D) May increase or decrease, depends on combustibles
Last Answer : (D) May increase or decrease, depends on combustibles
Description : In a petrol engine, which of the following gas gets exhausted out without burning and without transformation? a. CO2 b. CO c. O2 d. N2
Last Answer : ANSWER d. N2
Description : In low temperature carbonisation of coal, the (A) Yield of coke oven gas is 290 Nm3 /ton dry coal (B) Volatile matter in coke is zero (C) Temperature maintained is 700°C (D) Yield of tar is about 3% of dry coal
Last Answer : (C) Temperature maintained is 700°C
Description : Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is __________ Nm3. (A) 0.5 (B) 1 (C) 1/3 (D) 2.5
Last Answer : Option D
Description : Steam is throttled to 0.1 MPa with 20 degrees of superheat. (a) What is the quality of throttled steam if its pressure is 0.75 MPa (b) What is the enthalpy of the process? a) 97.6%,2713 kJ/kg b) -97.6%, 2713 kJ/kg c) 87.6%,3713 kJ/kg d) -87.6%, 3713 kJ/kg
Last Answer : 97.6%,2713 kJ/kg
Description : The compression in steel (fS) at failure for Fe - 415 grade steel using stress-strain curve shall be [ A ] 0.87 fy [ B ] 0.75 fy [ C ] 0.45 fy [ D ] 0.55 fy
Last Answer : [ B ] 0.75 fy
Description : Design yield stress for steel in tension and compression is [ A ] 0.65 fy [ B ] 0.87 fy [ C ] 0.75 fy [ D ] None of the above
Last Answer : [ B ] 0.87 fy
Description : Sublimation temperature of dry ice (solid CO2) is __________ °C. (A) -273 (B) 0 (C) -78 (D) 5
Last Answer : (C) -78
Description : Oxygen required for theoretically complete combustion of 1 Nm3 methane is __________ Nm3 . (A) 2 (B) 4 (C) 6 (D) 1
Last Answer : (A) 2
Description : Calorific value of wood gas is about __________ kcal/Nm3 . (A) 1500 (B) 3300 (C) 5400 (D) 8500
Last Answer : (B) 3300
Description : Ammonia content in raw coke oven gas is about __________ gm/Nm3 . (A) 1 (B) 5 (C) 50 (D) 100
Last Answer : (B) 5
Description : Dust content in raw blast furnace gas is about __________ gm/Nm3 ; hence it is cleaned to the dust level of about < 10 mg /Nm3 before use. (A) 15-30 (B) 1-2 (C) 70-100 (D) 150-200
Last Answer : (A) 15-30
Description : The calorific value of natural gas is about __________ kcal/Nm3 . (A) 10,000 (B) 2,500 (C) 25,000 (D) 35,000
Last Answer : (A) 10,000
Description : Yield of blast furnace gas is about __________ Nm3 /ton of pig iron. (A) 300 (B) 2000 (C) 5000 (D) 10000
Last Answer : (B) 2000
Description : The calorific value of L.D. converter gas is about __________ Kcal/Nm3 . (A) 1800 (B) 800 (C) 4500 (D) 10000
Last Answer : (A) 1800
Description : Calorific value of coke even gas produced by low temperature carbonisation of coal is about __________ Kcal/Nm3 . (A) 4000 (B) 2500 (C) 6500 (D) 10000
Last Answer : (C) 6500
Description : Gas yield in the Kopper-Totzek coal gasifier is about __________ Nm3 /ton coal (ash = 35%). (A) 150 (B) 1500 (C) 3500 (D) 5000
Last Answer : (C) 3500
Description : The calorific value of 'LPG' (50% propane + 50% butane) is about __________ kcal/Nm3 . (A) 5000 (B) 25,000 (C) 10,000 (D) 15,000
Last Answer : (B) 25,000
Description : Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen. (A) 1kg mole (B) 22.4 Nm3 (C) 32 kg (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : The slope correction for a 3° slope for a length of 100 m, is (A) -0.11 m (B) -0.12 m (C) -1.87 m (D) -0.137 m
Last Answer : (D) -0.137 m
Description : Determine the amount of heat required to produce 1Kg of steam at a pressure of 7 bar, at a temperature 29 degree Celsius, under the following . (i) When the steam is wet having dryness fraction 0.87 (ii) When the steam is dry saturated Assume specific heat = 2.35KJ/KgK
Last Answer : P 7bar T 29ᵒC x=0.9 m =1kg C p =2.35 KJ/KgK At pressure 7 bar saturation Temp T sat =165 ᵒC h f =697.2 KJ/Kg h fg= 2064.8 KJ/Kg i) Heat required when steam is wet ... ) When the stem is dry saturated hg=hf+hfg =2762 kj Heat actually required = 2762-121.8 = 2640.2 kj
Description : Quantity of coke produced from metallurgical coal may be around __________ percent. (A) 30 (B) 50 (C) 75 (D) 95
Last Answer : (C) 75
Description : Pick out the wrong statement. (A) Main constituents of LPG are propane and butane (B) C.V. of natural gas is about 10000 KCal/Nm3 (C) C.V. of LPG is about 26000 kcal/Nm3 (11500 kcal/kg) (D) L.P.G. is lighter than air
Last Answer : (D) L.P.G. is lighter than air
Description : Which of the following fuel gases will require maximum amount of air for combustion of 1 Nm3 gas? (A) Blast furnace gas (B) Natural gas (C) Producer gas (D) Water gas
Last Answer : (B) Natural gas
Description : Percentage of water in buffalo milk is:- a. 65-67 % b. 70-75 % c. 80-85 % d. 87-90 %
Last Answer : d. 87-90 %
Description : Reshma purchased 120 chairs at price of Rs. 110 per chair. He sold 30 chairsat a profit of Rs. 12 per chair and 75 chairs at profit of Rs. 14 per chairs. The remaining chairs were sold at a loss of Rs. 7 per chairs ... the average profit per table? A. Rs 10.56 B. Rs 10.87 C. Rs 12.123 D. Rs 12.67
Last Answer : Answer – B (Rs 10.875) Explanation – Total C.P = Rs. (120 x 110) =Rs. 13200. Total S.P = Rs.[(30 x 110 + 30 x 12) + (75 x 110 + 75 x 14) + (15 x 110 – 15 x 7) =Rs..14505 Average profit = Rs. (14505 – 13200) /120 = Rs. 1305/120= 10.875
Description : In the following question, select the missing number from the given alternatives. 14, 35, 87.5, ?, 546.875 Options: 1) 218.75 2) 262.5 3) 192.75 4) 178.5
Last Answer : Correct Answer: 218.75
Description : As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion __________ for the same percentage of excess air. (A) Decreases (B) Increases (C) Remain same (D) May increase or decrease depending on the type of fuel
Last Answer : (B) Increases
Description : Scaling of furnace stock is reduced by __________ in flue gas. (A) CO (B) H2 (C) High CO/CO2 (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Incomplete combustion of fuel in the furnace is judged by high __________ of the flue gases. (A) CO content (B) Dew point (C) CO2 content (D) O2 content
Last Answer : (A) CO content
Description : Blast furnace gas is a very poisonous gas because of its predominantly high __________ content. (A) H2O (B) CO2 (C) CO (D) CH4
Last Answer : (C) CO
Description : In order to maintain an oxidising atmosphere in a furnace, it should have (A) More of excess air (B) Less of excess air (C) More of CO in flue gas (D) More of CO2 in flue gas
Last Answer : (A) More of excess air
Description : 6 gm of carbon is burnt with an amount of air containing 18 gm oxygen. The product contains 16.5 gms CO2 and 2.8 gms CO besides other constituents. What is the degree of conversion on the basis of disappearance of limiting reactant? (A) 100% (B) 95% (C) 75% (D) 20%
Last Answer : (B) 95%
Description : Volumetric composition of flue gas analysed with the Orsat apparatus is : CO2 = 12%, O2 = 8%, CO = nil, N2 = 80%. This flue gas composition indicates that (A) Pure oxygen has been used for combustion ... very high (C) Excess air has been used for combustion (D) Hydrogen is not present in the fuel
Last Answer : (C) Excess air has been used for combustion