Hydraulics and Pneumatics Review Assignment

MET230: Hydraulics and Pneumatics
Unit 4 Review Assignment 2

Question 01
Which of the following is NOT true about hydraulic systems?
A. Over half of all system problems are traced directly back to the oil
B. Fire-resistant fluid should be used in applications where human safety is of concern
C. Hydraulic fluid must have good lubricity to prevent wear between closely fitted working
parts
D. In hydraulic systems, the operating temperatures must be kept between 170oF and 180oF
E. None of the above
Question 02
Which of the following is NOT true about hydraulic systems?
A. A strainer removes only larger particles and thus is a coarse filter
B. A loss of pressure in hydraulic systems is a symptom of pump malfunction
C. An excessive pressure drop occurs across a filter filled with contaminants
D. Solid contaminants in hydraulic fluids cause wear of moving parts
E. None of the above
Question 03
Which of the following hydraulic fluid categories is classified as fire-resistant?
A. Water-glycol solutions
B. Water-in-oil emulsions
C. Straight synthetics
D. High water content fluids
E. All of the above

Question 04
Which of the following is NOT true about fire-resistant fluid?
A. Special paints must be used in water-glycol solutions type
B. Straight synthetics type are Incompatible with most natural or synthetic rubber seals
C. Straight synthetics type are expensive
D. Straight synthetics type have high viscosity index
E. All of the above
Question 05
Which of the following is susceptible of making a pump noisy?
A. Air in the fluid
B. Pressure relief valve set too low
C. Chattering relief valve
D. Leak in hydraulic line.
E. All of the above
Question 06
Which of the following is a cause of low or erratic pressure in hydraulic circuit?
A. Air entering pump inlet
B. Misalignment of pump and drive unit
C. Pressure relief valve not properly seated
D. Dirty inlet strainer
E. All of the above
Question 07
Which of the following is a cause of no pressure in hydraulic circuits?

A. Pump turning in wrong direction
B. Directional control valve fails to shift
C. Defective actuator
D. Actuator load is excessive
E. All of the above
Question 08
Which of the following causes my make an actuator fail to move?
A. Heat exchanger turned off or faulty.
B. Actuator load is excessive
C. Undersized components or piping.
D. Incorrect fluid
E. None of the above
Question 09
Which of the following may cause a slow or erratic motion of an actuator?
A. Continuous operation of pressure relief valve.
B. Overloaded system.
C. Reservoir too small.
D. Excessive leakage through actuators or valves
E. None of the above
Question 10
Which of the following may cause an overheating of fluid in hydraulic systems?
A. Overloaded system.
B. Reservoir too small.