901. Pick out the correct statement pertaining to transition/ entrance length in fluid flow ?
A. The length of entrance region of pipe, in which full development of fluid flow takes place
such that velocity profile does not change downstream, is called the transition length
B. Transition length for laminar flow of Newtonian fluids in a pipe of diameter ‘d’ is equal to
0.05. D.NRe
C. Transition length for turbulent flow of Newtonian fluids in a smooth pipe of diameter ‘d’ is
equal to 50 D
D. All A., B. and C.

902. Low specific speed of a pump implies that, it is a/an ______________ pump?
A. Axial flow
B. Centrifugal
C. Mixed flow
D. None of these

903. What type of motion the fluid element undergoes, when it changes from one position to another position, such that the angle between the two sides changes ?
A. Rotation
B. Translation
C. Linear deformation
D. Angular deformation

904. For a given fluid flow rate, which of the following incurs maximum head loss ?
A. Orificemeter
B. Venturimeter
C. Flow nozzle
D. All of them incur the same head loss

905. Extraction of uranium from its ore is done by ______________ method?
A. Chemical
B. Pyrometallurgical
C. Physical beneficiation
D. Electrometallurgical

906. The atomic number of a radioactive element is not changed, when it emits _____________ rays?
A. α
B. β
C. γ
D. α & β

907. A moderator _____________ the neutrons?
A. Slows down
B. Absorbs
C. Accelerates
D. Reflects

908. Which of the following nuclear materials is fissile ?
A. Uranium-238
B. Thorium-232
C. Plutonium-239
D. None of these

909. In a homogeneous nuclear reactor, the _____________ are mixed together?
A. Fuel & coolant
B. Fuel & moderator
C. Coolant & moderator
D. None of these

910. What is the average life of a radioactive atom having a ‘half life period’ of T ?
A. 1.44 T
B. 0.144 T
C. 14.4 T
D. 2T

NOTE
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