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Environmental engineering
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q21 ⇒ The pH value of potable water should be between 6.5 to 8 [other wrong options] [Discuss in forum] 1 to 1.5 13 to 14 4 to 5 |
Q22 ⇒ Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur ? Troposphere [other wrong options] [Discuss in forum] Thermosphere Stratosphere none of these |
Q23 ⇒ Threshold limit value (TLV) of CO in air is __________ ppm. 50 [other wrong options] [Discuss in forum] 5 2000 5000 |
Q24 ⇒ The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU). 230 [other wrong options] [Discuss in forum] 20 750 1500 |
Q25 ⇒ The function of skimming tank in sewage treatment is to remove __________ substances. oil & fatty [other wrong options] [Discuss in forum] dissolved solid suspended solid gritty & inorganic |
Q26 ⇒ Noise level in a quiet private business office is about __________ decibels. 50 [other wrong options] [Discuss in forum] 25 70 85 |
Q27 ⇒ A man exposed to excessive noise level in the working environment may suffer from all (a), (b) & (c) [other wrong options] [Discuss in forum] hearing loss rupture of ear drum nervousness & fatigue |
Q28 ⇒ Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace. low amount of excess combustion air [other wrong options] [Discuss in forum] large quantity of excess combustion air hydrocarbon fuel pulverised coal as fuel |
Q29 ⇒ Deaeration of high pressure boiler feed water is done to reduce its dissolved oxygen content. [other wrong options] [Discuss in forum] foaming from boilers. its silica content. caustic embrittlement. |
Q30 ⇒ Removal of __________ results from the disinfection of water. bacteria [other wrong options] [Discuss in forum] turbidity odour hardness |
Q31 ⇒ Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by radial settling tank (thickener) using coagulant (lime & ferrous sulphate). [other wrong options] [Discuss in forum] biological oxygen pond. lagoons. filtration. |
Q32 ⇒ Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million). 5000 [other wrong options] [Discuss in forum] 50 1000 2000 |
Q33 ⇒ Aerodynamic noise resulting from turbulent gas flow is the most prevalent source of valve noise in fluid ilow control. It is caused due to both (a) & (b) [other wrong options] [Discuss in forum] Reynold stresses shear forces neither (a) nor (b) |
Q34 ⇒ Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)? Activated carbon adsorption [other wrong options] [Discuss in forum] Lagooning Biological oxidation pond Chemical coagulation |
Q35 ⇒ Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ? Dust catcher (gravity type) [other wrong options] [Discuss in forum] Cyclone separator Bag filter Hollow wet scrubber |
Q36 ⇒ 80% less than 200 mesh size particles are called powder [other wrong options] [Discuss in forum] smoke grit aggregates |
Q37 ⇒ Most efficient and suitable dust removal equipment for removal of flyash from flue gas in a thermal power plant is the electrostatic precipitator [other wrong options] [Discuss in forum] gravity settling chamber cyclone separator bag filter |
Q38 ⇒ Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels. 120 [other wrong options] [Discuss in forum] 90 150 180 |
Q39 ⇒ Presence of bacteria in potable (drinking) water causes disease [other wrong options] [Discuss in forum] turbidity bad odour bad taste & colour |
Q40 ⇒ Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools). 42865 [other wrong options] [Discuss in forum] 42737 15-20 25-30 |
Or |