單項(xiàng)選擇題Compared to a constant pitch propeller, a controllable pitch propeller().

A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed


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1.單項(xiàng)選擇題Compared to a constant pitch propeller, a controllable pitch propeller().

A.more efficiently uses available engine power
B.operates at a lower efficiency at a fixed speed
C.produces the same torque at lower engine power
D.develops its rated power at a lower speed

2.單項(xiàng)選擇題Which of the following statements describes the functions of a reservoir used in a hydraulic system?()

A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above

3.單項(xiàng)選擇題Which of the following statements describes the functions of a reservoir used in a hydraulic system?()

A.Dissipate heat
B.Trap foreign matter
C.Separate air from the oil
D.All of the above

4.單項(xiàng)選擇題Which of the problems listed could be indicated if a sight glass in the refrigerant liquid line is full of bubbles?()

A.Proper refrigerant charge
B.Faulty expansion valve
C.Insufficient refrigerant
D.Solenoid valve stuck open

5.單項(xiàng)選擇題Moisture in a refrigeration system can cause ().

A.freezing the expansion valve closed
B.corrosion of system piping
C.improper temperature regulation
D.all of the above