Related Questions

নিচের কোন তড়িৎ-চুম্বকীয় বিকিরণের কম্পাঙ্ক সবচেয়ে কম?(which of the following electromagnetic radiations has the lowest frequency?)
A গামা (Gamma)
B অবালোহিত (Infrared)
C অতিবেগুনী (Ultraviolet)
D এক্স-রে (X-Ray)
Consider the electromagnetic radiations having wavelengths 200 nm, 500 nm and 1000 nm. Which wavelength (s) of the following can make visual sensation to a human eye?
A 200 nm and 500 nm
B 500 nm and 1000 nm
C 500 nm only
D 200 nm and 1000 nm
Vacuum is applied in __________ zone, in case of a general type continuous rotary drum vacuum filter.
A Filtering
B Washing
C Drying
D All of the above
Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about __________ mm Hg absolute.
A 1 to 5
B 30 to 80
C 250 to 350
D 450 to 500
The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mmHg.
A 1.2
B 12
C 120
D 700
Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).
A 5-10
B 30-80
C 150-250
D 350-400
The ratio of the actual vacuum to the ideal vacuum in a condenser is called
A Condenser efficiency
B Vacuum efficiency
C Nozzle efficiency
D Boiler efficiency
In most of the vacuum crystalliser, vacuum is generally produced by means of a
A Suction pump
B Compressed air jet
C Steam jet ejector with a barometric condenser
D None of these
The mass number of an element is not changed, when it emits __________ radiations.
A α & γ
B α, β, & γ
C α & β
D β & γ
The vector sum of cutting velocity and chip velocity is __________ shear velocity.
A Equal to
B Less than
C More than
D None of these

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