Engineering MCQs Mechanical Mechanical Engineering MCQs Set 4 March 18, 2022March 18, 2022 0 Mechanical Engineering MCQs for Job Test and Interview Preparation, Graduates, Students, Competition Exams, and more. Machine Design, Machine Theory, Hydraulic Machines, and other topics are covered in this set of multiple-choice problems. /20 0 votes, 0 avg 5 Created on March 17, 2022 Mechanical Engineering MCQS Set 4 NameEmailPhone Number 1 / 20 Free air is the air at________________? atmospheric conditions at any specific location 20°C and 1 kg/cm2 and relative humidity of 36% 0°C and standard atmospheric conditions 15°C and 1 kg/cm2 25°C, 1 kg/cm2 and relative humidity of 50%. 2 / 20 For pipes, laminar flow occurs when Roynolds number is__________________? less than 2000 between 2000 and 4000 more than 4000 less than 4000 none of the above 3 / 20 Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?Isothermal compression efficiency, even when running at high speed, can be approached by using multi-stage compression cold water spray both A. and B. above fully insulating the cylinder high stroke 4 / 20 Adiabatic compression is one in which___________________? temperature during compression remains constant no heat leaves or enters the compressor cylinder during cornpression temperature rise follows a linear relationship work done is maximum entropy decreases 5 / 20 Standard air is the air at_____________________? atmospheric conditions at any specific location 20°C and 1 kg/cm2 and relative humidity 36% 0°C and standard atmospheric conditions 15°C and 1 kg/cm2 25°C, 1 kg/cm2 and RH of 60%. 6 / 20 What will be the volume of air at 327°C if its volume at 27°C is 1.5 m3/mt ? 3 m3/mt 1.5 m3/mt 18 m3/mt 6 m3/mt 0.75 m3/mt 7 / 20 Maximum work is done in compressing air when the compression is_________________? isothermal adiabatic polytropic any one of the above none of the above 8 / 20 The pressure and temperature conditions of air at the suction of compressor are_________________? atmospheric slightly more than atmospheric slightly less than atmospheric pressure slightly more than atmospheric and temperature slightly less than atmospheric pressure sightly less than atmospheric and temperature slightly more than atmospheric 9 / 20 An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________? one adiabatic, two isobaric, and one constant volume two adiabatic and two isobaric two adiabatic, one isobaric and one constant volume one adiabatic, one isobaric and two constant volume two isobaric, two adiabatic and one constant volume 10 / 20 Isothermal compression though most efficient, but is not -practicable because_________________? ityrequires very big cylinder it does not increase pressure much it is impossible in practice compressor has to run at very slow speed to achieve it it requires cylinder to be placed in water 11 / 20 The fluid forces considered in the Navier Stokes equation are__________________? gravity, pressure and viscous gravity, pressure and turbulent pressure, viscous and turbulent gravity, viscous and turbulent none of the above 12 / 20 The capacity of a compressor is 5 m /mih. 5 m /min refers to_______________? standard air free air compressed air compressed air at delivery pressure air sucked 13 / 20 The compressor capacity with decrease in suction temperature_________________? increases decreases remains unaffected may increase or decrease depending on compressor capacity increases upto certain limit and then decreases 14 / 20 All the terms of energy in Bernoulli’s equation have dimension of_______________? energy work mass length time 15 / 20 Inter cooling in compressors__________________? cools the delivered air results in saving of power in compressing a given volume to given pressure is the standard practice for big compressors enables compression in two stages prevents compressor jacket running very hot 16 / 20 In a forced vortex, the velocity of flow everywhere within the fluid is__________________? maximum minimum zero non-zero finite unpredictable 17 / 20 The overall isothermal eiffciency of compressor is defined as the ratio of_______________? isothermal h.p. to the BHP of motor isothermal h.p. to adiabatic h.p. power to drive compressor to isothermal h.p. work to compress air isothermally to work for actual compression isothermal work to ideal work 18 / 20 The- most efficient method of compressing air is to compress it_________________? isothermally adiabatically isentropically isochronically as per law pV 19 / 20 Isothermal compression effeicency can be attained by running the compressor__________________? at very high speed at very slow speed at average speed at zero speed isothermally 20 / 20 1 m of air at atmospheric condition weighs approximately__________________? 0.5 kg 1.0 kg 1.3 kg 2.2 kg 3.2 kg Your score is LinkedIn Facebook Twitter VKontakte 0% Restart quiz Please rate this quiz Send feedback
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