One Question per Day on Refining Knowledge (Technology) 1103018

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Multiple-choice questions:
1. Which of the following is NOT one of the functions of hydraulic oil? ( )
A. Power transmission
B. Control
C. Lubrication and cooling
D. Rust and corrosion prevention

2. Material at its dew point is ( )
A. Subcooled liquid
B. Saturated liquid
C. Saturated vapor
D. Superheated vapor

3. In a centrifugal pump, the component that cannot convert kinetic energy into static pressure energy is ( )
A. Pump casing
B. Guide vane
C. Impeller
D. Pump shaft

4. When a fluid flows stably, ( )
A. The mass flow rate varies across different cross-sections
B. The flow velocity must be the same across all cross-sections
C. The volume flow rate is the same at every cross-section
D. The pressure at a given cross-section changes

5. What is the relationship between vacuum level and absolute pressure? ( )
A. The higher the vacuum level, the higher the absolute pressure
B. If the vacuum level is the same, the absolute pressure is also the same
C. When the absolute pressure is lower than atmospheric pressure, the reading on the pressure gauge represents the vacuum level
D. When the vacuum level is zero, the absolute pressure is 1 atm

Answers: DCDCC