4-72. What, if anything, would the continuedoperation of a contaminated hydraulic systemcause?1. Normal wear2. Early failure3. Late failure4. Nothing, if only used for a short time4-73. Prior to flight, the air storage bottles for theemergency pneumatic system are filled withwhat gas?1. Carbon dioxide2. Oxygen3. Hydrogen4. Nitrogen4-74. The shuttle valve is used for what purpose?1. To transfer pneumatic pressure2. To transfer hydraulic pressure3. To direct fluid back to accumulator4. To separate normal systems fromemergency pneumatic systems4-75. By what means are the air compressors in mostaircraft driven?1. Electric motor2. Hydraulic motor3. Electrohydraulic motor4. Electropneumatic motor4-28
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