20. Crude oil is pumped by a __________ pump.
A. gear
B. centrifugal
C. screw
D. reciprocating
Option B
22. A good lubricant should have high
A. viscosity index
B. volatility
C. pour point
D. none of these
Option A
Option C
20. Crude oil is pumped by a __________ pump.
A. gear
B. centrifugal
C. screw
D. reciprocating
Option B
22. A good lubricant should have high
A. viscosity index
B. volatility
C. pour point
D. none of these
Option A
Option C