For the production of very high vacuum, a _____________ pump is normally used?
		A. Diffusion
B. Centrifugal
C. Jet ejector
D. Piston
		A. Diffusion
B. Centrifugal
C. Jet ejector
D. Piston
		A. 1.5
B. 1
C. 0
D. 5
		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.
		A. Temperature
B. Pressure
C. Both A. & B.
D. Neither A. nor B.
		A. Wall roughness
B. Reynolds number
C. Both A. & B.
D. Neither A. nor B.
		A. 20 m/sec
B. 10 m/sec
C. 5 √2 m/sec
D. 5 m/sec
		A. Reciprocating compressor
B. Blower
C. Axial flow compressor
D. Centrifugal compressor