题目内容

The input power to hydraulic pump should be greater than the output power of the hydraulic pump, because of ().

A. leakage loss;
B. friction loss;
C. overflow loss;
D. both leakge loss and friction loss

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Which type of hydraulic pump can be used as a variable displacement pump? ()

A. gear pump
B. single acting vane pump
C. double acting vane pump
D. B + C

Variable displacement pumps used in hydraulic applications can1. have variable flow rate2. consume less energy3. be operated with high accuracy for slow and rapid motion 4. generate more heat

A. 1 and 2
B. 3 and 4
C. 1, 2 and 3
D. all the above

Electric motor has a speed of 1200 rpm and output rate of pump is 6 mL/rev. Calculate flow rate of pump in l/min

A. 6 l/min
B. 7.2 l/min
C. 5 l/min
D. none of the above

Calculate the power absorbed by the pump if, it has a flow rate of 20 mL/rev and develops a maximum pressure of 70 bar, when electric motor runs at a speed of 1200 rpm.

A. 1.9 kW
B. 2.8 kW
C. 2.3 kW
D. none of the above