Description : In a low to medium temperature waste heat recovery system which of the device is most suitable a) Economiser b) Heat wheels c) air preheater d) Recuperator
Last Answer : Heat wheels
Description : It is the unbalanced force developed in a turbo jet engine that is caused by the difference in the momentum of the low-velocity air entering the engine and the high velocity exhaust gases leaving the engine. a. Fall b. Lift c. Drag d. Thrust
Last Answer : Thrust
Description : Nellore to medium temperature waste heat recovery system the most suitable device is ------ a) Economizer b) Heat wheels c) Air preheater d) Recuperate d) Carbonate
Description : The economiser is used in boilers to........ A]Increase thermal efficiency of boiler B]Economise on fuel C]Extract heat from the exhaust the gases D]Increase flue gas temperature
Last Answer : A]Increase thermal efficiency of boiler
Description : A waste heat recovery unit is an energy recovery heat exchanger that transfers heat from process outputs at ........ a) High temperature b) Medium temperature c) Low temperature d) Both a & b
Last Answer : High temperature
Description : Heat loss can be classified into ....... a) High temperature b) Low temperature c) Medium temperature d) All of the above
Last Answer : All of the above
Description : The waste heat energy could be used to produce ....... a) Cool air b) Hot air c) Exhaust gas d) All of the above
Last Answer : Cool air
Description : Recovery of heat from dryer exhaust air is a typical application of: a) Waste heat recovery boiler b) Heat pump c) Heat wheel d) Economizer
Last Answer : Heat wheel
Description : 'Flare tower' used in industry is meant for (A) Venting off (after burning) the excess inflammable/toxic gases at high pressure (B) Absorbing the pollutant gases from the furnace exhaust (C) Cooling of furnace exhaust gases (D) None of these
Last Answer : (A) Venting off (after burning) the excess inflammable/toxic gases at high pressure
Description : Calculate the recoverable waste heat (Q, in kCal/hour) from flue gases using the followingparameters: V (flow rate of the substance) 2000 m3/hr r (density of the flue gas): 0.9 kg/m3 Cp (specific heat ... (temperature difference): 120 oC h (recovery factor): 50% a. 21600 b. 43200 c. 25600 d. 34000
Last Answer : 21600
Description : According to Avogadro's Hypothesis (a) the molecular weights of all the perfect gases occupy the same volume under same conditions of pressure and temperature (b) the sum of partial pressure of ... gases have two values of specific heat (e) all systems can be regarded as closed systems.
Last Answer : Answer : a
Description : According to kinetic theory of gases, the absolute zero temperature is attained when (a) volume of the gas is zero (b) pressure of the gas is zero (c) kinetic energy of the molecules is zero (d) specific heat of gas is zero (e) mass is zero.
Last Answer : Answer : c
Description : Ringelmann chart is used for the measurement of the (A) Combustibles present in automobile exhaust (B) Smoke density from a chimney (C) Exhaust gas density (D) Flue gas temperature
Last Answer : (B) Smoke density from a chimney
Description : In a diesel engine the high temperature needed to ignite the fuel is achieved by – (1) using heat from exhaust (2) the battery (3) compressing air in the cylinders (4) an electrical spark
Last Answer : (3) compressing air in the cylinders Explanation: Diesel engines use the heat of compressed air to ignite the fuel (intakes air, compresses it, then injects fuel). Diesel engines need high compression ratios to generate the high temperatures required for fuel auto ignition.
Description : In a diesel engine the high temperature needed to ignite the fuel is achieved by (1) using heat from exhaust (2) the battery (3) compressing air in the cylinders (4) an electrical spark
Last Answer : compressing air in the cylinders
Description : The third law of thermodynamics states that the (A) Heat capacity of a crystalline solid is zero at absolute zero temperature (B) Heat transfer from low temperature to high temperature source is ... without external work (C) Gases having same reduced properties behaves similarly (D) None of these
Last Answer : (A) Heat capacity of a crystalline solid is zero at absolute zero temperature
Description : __________ the exhaust gas is an indication of the incomplete combustion of fuel. (A) Low temperature of (B) High temperature of (C) High % of CO in (D) High % of CO2in
Last Answer : (C) High % of CO in
Description : Scavenging air in diesel engine means a. air used for combustion under pressure b. forced air for cooling the cylinder c. burnt air containing products of combustion d. air used for forcing burnt gases out of the engines cylinder during the exhaust stroke
Last Answer : ANSWER d. air used for forcing burnt gases out of the engines cylinder during the exhaust stroke
Description : Metal present in the exhaust gases of ve- hicles?
Last Answer : Lead
Description : A scrubber in the exhaust of a chemical industrial plant removes (a) gases like sulphur dioxide (b) particulate matter of the size 5 micrometer or above (c) gases like ozone and methane (d) particulate matter of the size 2.5 micrometer or less.
Last Answer : a) gases like sulphur dioxide
Description : Sulphur dioxide present in the industrial chimney exhaust gases causes (A) Respiratory & lung disease (B) Reduction in plant's productivity owing to acid rain (C) Corrosion of building materials (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : It is easy to detect and monitor excess air a. As oxygen not used for combustion is heated and discharged with the exhaust gases. b. Oxygen is discharged without heating c. Both a. & b. d. None of above
Last Answer : a. As oxygen not used for combustion is heated and discharged with the exhaust gases.
Description : Superchargers are driven by A. Electric current from the battery B. Exhaust gases from engine C. Direct connection with the engine power D. None of the above
Last Answer : C. Direct connection with the engine power
Description : Turbo chargers are driven by A. Direct connection with engine power B. Exhaust gases from engine C. Electric current from the battery D. None of the above
Last Answer : B. Exhaust gases from engine
Description : The plume rise in a coal based power plant depends on: (i) Buoyancy (ii) Atmospheric stability (iii) Momentum of exhaust gases Identify the correct code (A) (i) and (ii) only (B) (ii) and (iii) only (C) (i) and (iii) only (D) (i), (ii) and (iii)
Last Answer : (B) (ii) and (iii) only
Description : The most suitable motor oil for use in a car in cold weather is: w) a high viscosity oil x) a low viscosity oil y) a medium viscosity oil
Last Answer : ANSWER: X -- A LOW VISCOSITY OIL
Description : A company is producing 15000 mobiles annually. Determine production scale of company a.Low Production b.Medium Production c.High Production d.None
Last Answer : c.High Production
Description : is not a type of spray a) High volume spray b) Medium volume spray c) Low volume spray d) Ultra low volume spray
Last Answer : Medium volume spray
Description : According to Clausis statement of second law of thermodynamics (a) heat can't be transferred from low temperature source to high temperature source (b) heat can be transferred for low temperature to ... to high temperature source without the aid of external energy (e) all of the above.
Last Answer : Answer : d
Description : Which of the following represents the perpetual motion of the first kind (a) engine with 100% thermal efficiency (b) a fully reversible engine (c) transfer of heat energy from low ... its own energy (e) production of energy by temperature differential in sea water at different levels.
Description : In four stroke engine which of the following is also known as power stroke a. Suction stroke b. Compression stroke c. Expansion stroke d. Exhaust stroke (Ans:c) Measurements of fuel and air ... into IC engine,___________its efficiency A. increase B. decrease C. does not alter D. unpredictable on
Last Answer : ANSWER : B
Description : Gases have (a) only one value of specific heat (b) two values of specific heat (c) three values of specific heat (d) no value of specific heat (e) under some conditions one value and sometimes two values of specific heat.
Last Answer : Answer : b
Description : A turbo chargers are driven by 1. Engine 2. Exhaust gas 3. Dynamo 4. PTO ans 2
Last Answer : ans 2
Description : Why is exhaust steam coming out of turbine is admitted to a steam header? a) To increase the pressure b) To decrease the velocity c) To decrease the pressure drop d) To control the pollution
Last Answer : To decrease the pressure drop
Description : Gas thermometers are more sensitive than the liquid thermometers because the gases – (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high specific heat
Last Answer : (1) have large coefficient of expansion Explanation: Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the has thermometer is more sensitive than liquid (mercury) thereto-meter.
Description : Gas thermometers are more sensitive than the liquid thermometers because of the gases - (1) have low specific heat (2) have high specific heat (3) have large coefficient of expansion (4) are lighter
Last Answer : (1) have low specific heat Explanation: Gas thermometers are more sensitive because gas has low specific heat than liquids.
Description : Gas thermometers are more sensitive than the liquid thermometers because the gases (1) have large coefficient of expansion (2) are lighter (3) have low specific heat (4) have high,specific heat
Last Answer : have large coefficient of expansion
Description : You may recover the incremental capital cost used to purchase a __________ air conditioner. a) Lower star c) Higher star b) Higher power d) Lower power
Last Answer : Higher star
Description : Traditionally, waste heat of low temperature range ________ has not been used for electricitygeneration despite efforts by ORC companies, mainly because the Carnot efficiency is rather low. a) 0-250 °C b) 0-150 °C c) 0-200 °C d) 0-120 °C
Last Answer : 0-120 °C
Description : Using an organic fluid that boils at a low temperature means that energy could be regeneratedfrom waste fluids is known as ________. a) Heat exchanger b) Heat remover c) Heat pumps d) Heat absorber
Last Answer : Heat pumps
Description : The low temperature reservoir of the heat reservoirs is known as ______. A. Source reservoir B. Heel reservoir C. Toe reservoir D. Sink reservoir
Last Answer : Sink reservoir
Description : All gases during throttling process at atmospheric temperature and pressure show a cooling effect except (A) CO2 (B) H2 (C) O2 (D) N2
Last Answer : (B) H2
Description : According to Avogadro's law A. the product of the gas constant and the molecular mass of an ideal gas is constant B. the sum of partial pressure of the mixture of two gases is sum of the ... all gases, at the same temperature and pressure, contain equal number of molecules D. all of the above
Last Answer : Answer: C
Description : According to Avogadro’s law, the density of any two gases is __________ their molecular masses, if the gases are at the same temperature and pressure. A. equal to B. directly proportional to C. inversely proportional to
Last Answer : Answer: B
Description : Which of the following parameters is constant for a mole for most of the gases at a given temperature and pressure (a) enthalpy (b) volume (c) mass (d) entropy (e) specific volume.
Description : According to which law, all perfect gases change in volume by l/273th of their original volume at 0°C for every 1°C change in temperature when pressure remains constant (a) Joule’s law (b) Boyle’s law (c) Regnault’s law (d) Gay-Lussac law (e) Charles’ law.
Last Answer : Answer : e
Description : Too much of excess air in combustion results in high (A) Fuel consumption for the same heat load (B) Stack gas temperature (C) Percentage of oxygen in flue gases (D) All (A), (B) and (C)
Description : Pick out the wrong statement (A) Low ozone layer thickness in polar regions is due to cold climatic conditions (B) Amount of unburnt hydrocarbons emitted by two stroke petrol engine is more ... can enter the blood stream & the digestive system/ lungs and is responsible for causing Minamata disease
Last Answer : (D) Mercury as a pollutant can enter the blood stream & the digestive system/ lungs and is responsible for causing Minamata disease
Description : If one cylinder of a diesel engine receives more fuel than others , then for that cylinder the A. exhaust will be smoky B. scavenging occurs C. exhaust temperature will be high D. engine starts overheating
Description : As shown in the illustration, which set of conditions, evident to the operator and the 'setpoint module' respectively, will result in a high exhaust temperature alarm on the 'starboard main engine'? EL-0094 A. 50°F and 3.3 volts B. 180°F and 6.0 volts C. 750°F and 0-10 volts D. 900°F and 7.5 volts
Last Answer : Answer: D