大工12秋《液压传动与控制》在线作业1（Great works 12 autumn hydraulic transmission and control online homework 1）.doc

大工12秋《液压传动与控制》在线作业1（Great works 12 autumn hydraulic transmission and control online homework 1） Great works 12 autumn hydraulic transmission and control online homework 1 Multiple-choice questions, multiple-choice questions, judgment questions First, radio questions (5 questions, 25 points) 1. when the pressure increases, the viscosity of the hydraulic fluid. Elevated A. B. decrease C. invariant High and low when D. The correct answer: A full marks: 5 points 2. () is a viscosity coefficient that represents the magnitude of friction in a flowing fluid. A. absolute viscosity B. kinematic viscosity C. relative viscosity D.s viscosity The correct answer: A full marks: 5 points 3. hydraulic system uses liquid () to transfer power. A. potential B. kinetic energy C. pressure energy D. thermal energy The correct answer: C full marks: 5 points 4. the pressure in the stationary liquid increases with the liquid depth H. A. linear increase B. nonlinear increase C. linear decrease D. nonlinear reduction The correct answer: A full marks: 5 points 5. when the temperature rises, the viscosity of the hydraulic fluid (). Elevated A. B. decrease C. invariant High and low when D. The correct answer: B full marks: 5 points Great works 12 autumn hydraulic transmission and control online homework 1 Multiple-choice questions, multiple-choice questions, judgment questions Two, (a total of 5 multiple-choice questions, a total of 25 points.) 1. what are the components of a hydraulic system?. A. energy devices B. actuator C. control and adjustment device D. auxiliary device The correct answer: ABCD full marks: 5 points 2., the flow state of liquid can be divided into (). A. laminar flow B. turbulence C. steady current D. turbulence The correct answer: AB full marks: 5 points 3. hydraulic pumps and hydraulic motors are classified according to their structural forms. A. gear type B. plunger type C. blade type D. push-pull type The correct answer: ABC full marks: 5 points 4. vane pump according t