Transition length for turbulent flow in smooth pipe is equal to _____________ times the pipe diameter?

A. Where there is no velocity gradient
B. At higher temperatures
C. Only in Newtonian fluids
D. None of these

A. Momentum
B. Mass
C. Energy
D. Both B. & C.

A. 1/D
B. 1/D2
C. 1/D5
D. D2

A. Reciprocating compressor
B. Blower
C. Axial flow compressor
D. Centrifugal compressor

A. As velocity
B. As (velocity)2
C. Inversely as the square of diameter
D. Inversely as the velocity

A. Gravity
B. Drag
C. Buoyant
D. All A., B., & C.