"Hydraulic and pneumatic technology" Review questions and homework answers 1 flow continuity equation is () in the fluid mechanics of the expression, and Bernoulli equation () in the fluid mechanics of the expression.
C, A (A) Law of conservation of energy (B) Momentum theorem (C) Law of mass conservation (D) Others 2. Flow through a fixed parallel plate slit is proportional to () .
D, A (A) Primary (B) 1/2 C (C) Quadratic (D) Cubic 3. Double-acting vane pumps have structural characteristics of () and single-acting vane pumps have a Features.
A, C, B, D (A) Hydraulic radial force balance on rotor and stator (B) Hydraulic pressure balance at top and bottom of all blades (C) Instantaneous flow rate is uniform regardless of blade thickness ( D) to change the eccentricity between the stator and the rotor can change the displacement 4. A horizontal double-stick hydraulic cylinder placed with a three-position four-way solenoid valve, the valve is required in the middle, the hydraulic pump unloading, and Hydraulic cylinder floating, the median function should be used (); When the valve is in the middle, the hydraulic pump unloading, and the hydraulic cylinder locked, the median function should be used ().
D, B (A) O type (B) M type (C) Y type (D) H type 5. There are two regulating pressure of 5MPa and 10MPa relief valve in series in the hydraulic pump outlet, the pump outlet pressure (); Parallel in the hydraulic pump outlet, the pump outlet pressure () again.
C; A (A) 5MPa (B) 10MPa (C) 15MPa (D) 20MPa 6. Requires multiple control valve actuator multiple actuators to achieve more than two complex action, multi-way valve connection Way (), multiple actuators to achieve sequential action, multi-way valve connection ().
A; C (A) Tandem oil circuit (B) Parallel oil circuit (C) Tandem oil circuit (D) Other 7. Sequence valve in the system for unloading valve, should be used , Should be used () type.
C; A (A) Internal control internal leakage type (B) Internal control leakage type (C) External control leakage type (D) External control leakage type 8. Double extension hydraulic cylinder with piston rod, Of the moving range of the effective cylinder bore stroke (); the use of cylinder fixed placement, table movement range piston effective stroke ().
B; C (A) 1