The features of external gear pump include ().
A. the structure is compact and the flow rate is easy to adjust
B. the method of reducing the oil inlet is usually used to reduce the radial imbalance force
C. the noise is small, the oil delivery is uniform, the volume is small and the weight is light
D. low cost, reliable work, weak self-priming ability, mostly used in low-pressure system
查看答案
Which type of displacement is observed in gear pumps?
A. only variable displacement
B. only fixed displacement
C. both fixed and variable displacement
D. none of the above
What causes suction of fluid into the gear pump?
A. pressure drops during disengagement of teeth at the suction side
B. pressure increases during disengagement of teeth at the suction side
C. pressure drops during engagement of teeth at the suction side
D. pressure increases during engagement of teeth at the suction side
What is the principle of operation used in gear pumps?
A. two gears rotate in same direction
B. two gears rotate in opposite direction
C. two gears rotate in same and opposite direction
D. none of the above
What cause discharge of fluid in an external gear pump?1. the electric motor drives one gear which turns the other gear2. the electric motor drives both the gears simultaneously3. fluid passes between the gears to discharge side4. fluid passes through interior of the casing between teeth and casing and not between the gears
A. 1 and 3
B. 2 and 3
C. 1 and 4
D. 2 and 4
微信支付 
支付宝支付