What causes internal leakage in internal gear pump?
A. less tolerance level between the meshing surfaces
B. more tolerance level between the meshing surfaces
C. no tolerance between the meshing surfaces
D. none of the above
查看答案
What is the relation between pressure and overall efficiency for a gear pump?
A. as pressure increases, overall efficiency decreases
B. as pressure increases, overall efficiency increases
C. overall efficiency is not affected by change in pressure
D. none of the above
How is the smooth and continuous discharge of fluid achieved in a gear pump?
A. increasing number of teeth
B. decreasing number of teeth
C. none of the above
What is the function of the the triangle groove on the valve plate of double acting vane pump? ()
A. The liquid pressure at the bottom and top of the blade is balanced with each other
B. When the sealing volume from the oil absorption area enters into the pressure oil area, the sudden change of pressure is avoided and the flow pulsation is reduced
C. The rotor and blade can rotate freely to keep a certain clearance between them and the port plate
D. When the blade moves radially in the rotor slot, the velocity does not change suddenly, and the impact of vane pump is reduced
Which pump can't be used as a bidirectional variable displacement pump ().
A. double acting vane pump
B. single acting vane pump
C. axial piston pump
D. radial piston pump
微信支付 
支付宝支付