Related Questions

Maximum work is done in compressing air when the compression is
A Isothermal
B Adiabatic
C Polytropic
D None of the above
For minimum work required to compress and deliver a quantity of air by multistage compression
A The compression ratio in each stage should be same
B The intercooling should be perfect
C The work-done in each stage should be same
D All of the above
একটি স্প্রিংকে (স্প্রিং ধ্রুবক- 980 Nm-1) 10 cm সঙ্কুচিত করে এর সাহায্যে 200 g ভরের একটি বলকে লম্বভাবে উপরে ছোড়া হলো। বলটি উপরের দিকে কত উচ্চতায় উঠবে? (A 200 g ball is thrown vertically upward by compressing a spring (spring constant: 980 Nm-¹) by 10 cm. What will be the height reached by the ball?)
A 0.25 m
B 2.5 m
C 25.5 m
D 51 m
Which one of the following functions can be used to compress a string?
A zip_compress()
B zip()
C compress()
D gzcompress()
Which DOS command allows you to compress existing disks and to create new compressed volumes?
A DEFRAG
B DBLSPACE
C SCANDISK
D MSAV
E None of the above
If h₁ = inner film co-efficient and /h₂ = outer film co-efficient, then the overall heat transfer co-efficient is
A Always less than h₁
B Always between h₁ and h₂
C Always higher than h₂
D Dependent on metal resistance
A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
A 2
B 20.8
C 20.2
D 20.5
B is thrice as efficient as A and C is 0.75 times as efficient as A. What is the ratio of number of days taken by A, B and C when they work individually?
A 4:1:3
B 3:1:4
C 2:3:1
D 5:1:2
The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is
A More
B Less
C Some
D Either more or less ; depends on the nature of vapor
Overall mass transfer co-efficient in case of absorption of __________ in water is based on the gas film co-efficient only, as the mass transfer process is gas film (phase) controlling.
A CO2
B SO2
C NH3
D None of these

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