Small furnace draught is accurately measured by an inclined tube manometer, in which the manometric liquid used most commonly is __________________?

A. Orificemeter
B. Open weir
C. Kennison nozzle
D. Both B. & C.

A. Insulator
B. Conductor
C. Solid semi-conductor
D. Liquid semi-conductor

A. Average velocity
B. Maximum velocity
C. Point velocity
D. Static pressure

A. Proportional to
B. Inversely proportional to the square root of
C. Proportional to the square root of
D. Inversely proportional to the square of

A. Nickel
B. Brass
C. Chromel
D. Invar

A. Piston type meter
B. Rotameter
C. Magnetic flow meter
D. Orifice and tapered plug meter