2010年挖掘机考试最新模拟试题（The latest simulation test of excavator test in 2010）

2010年挖掘机考试最新模拟试题（The latest simulation test of excavator test in 2010） 2010年挖掘机考试最新模拟试题(The latest simulation test of excavator test in 2010) 2. The tensioning wheel of the triangle belt should be positioned on the inner side of the loose side of the triangle to the side of the big belt wheel. The 3-key drive ensures accurate average transmission ratio and large transmission power. The tooth spacing of the active gear and the driven gear is equal, and the right engagement can be ensured. A middle gear in the 5 wheel system can be both the front and rear driving wheel. When the working volume is at the same speed as the speed, the two-stroke petrol engine is more powerful than the four-stroke gasoline engine. The seven-side valve type distribution mechanism is helpful for the engine to inflate and exhaust the exhaust gas, so the engine is dynamic and economical. The engine has different requirements for fuel mixture in various operating conditions. When the wire rope is connected with a rope, the cable clamp shall be placed on the side of the wire rope. 10 when lifting objects, although not looking for a positive center of gravity, because of the steel wire rope to help to tie firmly also won't fall. When the rope is used to connect the wire rope, the length of the last rope is not less than 140 mm. The minimum value should be taken when measuring the diameter of a wire rope with a vernier caliper. Excavators shall not excavate rocks or permafrost without blasting. 14 crawler excavators should travel at a slow speed and not change on the ramp. The piston is an important part of crank connecting rod mechanism, which is composed of combustor and high temperature and high pressure. 16 in the driving power, the speed of the triangle is too big or too small, which also produces "skid" phenomenon. For the trapezoidal thread used in transmission or spiral transmission, the process is good, but the thread pair has a poor neutral precision. 18 ball screw drive is efficient and sensitive. The dividing circle of the standard gear is the same as the width of the teeth and the width of the tooth groove. The tooth profile of the normal worm in the axial section is the same as the standard tooth. The transmission ratio of worm drive ratio is large but the self-locking performance is poor. Double crank mechanism can be used to make the inertia screen reciprocating movement. There is no "dead spot" for the eccentric mechanism. When the CAM turns an Angle, the distance from the moving part is called the journey. The conical brake is generally applied to the braking of a larger torque. During the operation of the machine, the clutch can be separated or joined at any time. The drawing shall be marked with a full size and shall include dimension line, dimension line and size number. Diesel engine spray oil is sprayed on the piston before reaching the point of arrival. The internal combustion engine exhausts the black smoke, indicating that the mobile combustion chamber enters the oil. The starter of the excavator engine USES ac motor. In a one-way ac circuit, only pure resistance circuit, current and voltage are the same phase. 32 in the site of a dedicated power supply, the electrical equipment must adopt tn-s zero protection system. The hydraulic transmission device is essentially an energy conversion device. The greater the thrust on the piston, the faster the piston moves. The movement speed of the piston is only related to the area of the piston and the flow of the cylinder to the hydraulic cylinder, which has nothing to do with the pressure size. Pressure of pressure of hydraulic system pressure of pressure of pressure. The number of plunger plunger in the 37 axial piston pump is mostly even, because it is easy to achieve symmetrical distribution. The single rod piston cylinder of the differential connection enables the piston to achieve quick movement. The rated flow of hydraulic cylinder should be slightly higher than the maximum flow required by the system. The function of the 40 speed limit loop is to limit the maximum working speed of the system. Second choice 1 in 6135 diesel engine, 6 represents 6 cylinders, 135 represents (). A. Cylinder length B. Diameter of cylinder Friction wheel drive is generally not (). A. Protective effect when overload B. Can transfer greater torque The nominal diameter of 3 threads refers to (). A. Thread large diameter B. Thread path The screw drive mechanism of the unidirectional force is widely adopted (). A. rectangular thread b. acme thread 5 pair involute gear drive (). A. Keep the transmission ratio constant. B. the transmission ratio is related to the center distance 6 the constant transmission is (). A. Drive B. Gear drive The axis of the driving part is used to support the shaft of the driving part. A. Spindle B. Rotation axis An ordinary single-row centripetal ball bearing, medium and narrow series, inner diameter d = 60 mm ball bearing code is (). A. 312, b. 860 9 flange coupling (). A. A movable rigid coupling B. Simple structure, easy to use and high torque The 10 crank connecting rod mechanism is composed of piston group, connecting rod group, crankshaft and (). A. Flywheel B. Cylinder block The mixture of diesel engines is formed in (). A. Carburetor B. Cylinder The main characteristics of the internal combustion engine are load characteristics and (). A. power characteristics b. consumption characteristics The role of the flywheel in the back end of the crankshaft is () and storage of energy. A. Reduce crankshaft speed B. Improve the stability of crankshaft operation The inflating coefficient of the engine is always (). A. Greater than 1. B. Less than 1 A small gap in the air gap causes the engine () and the power to drop. A. exhaust is not enough b. the valve is not close enough to cause air leakage The form of exercise secondary contact that can transfer more complex motion is (). A. CAM contact with B The tooth Angle () on the circle of involute cylindrical gear. A. Size has an effect on tooth shape, but it does not affect the transmission of B 18 helical gear (). A. The end surface parameter is the standard parameter b. the helical direction of the two wheel teeth is consistent in the meshing The drive is smooth, noiseless, cushioned, and the driving is (). A. Drive B. Worm drive Crank rocker mechanism (). A. Only turn the continuous rotation into reciprocating oscillations. Only the reciprocating swing can be turned into A continuous rotation The wrong way to eliminate the "dead point" of the organization is (). A. Use the flywheel device B The four-bar mechanism with the quick-return characteristic is (). A. crank mechanism b. double crank mechanism CAM mechanism (). A. it is possible to draw up the motion law of the active part arbitrarily The pressure Angle should be () when the moving part of the CAM mechanism is required. A. Greater than or equal to 30 degrees B. Less than or equal to 30 degrees The CAM mechanism () working at the speed of uniform motion. A. It produces A rigid impact B Common flat key application features (). A. depending on the side transmission torque, it is good for the neutral and easy to install. B. Can realize the axial orientation of the parts on the shaft The inverted Angle on the 27th axis is (). A. in order to assemble convenient B. To reduce stress concentration The characteristics of integral sliding bearing are (). A. Simple structure B. Easy to remove The direction of the magnetic field indicated by the first point of the magnetic force line is the direction of the point (). A. Normal b. tangent 30 transformers can change the alternating voltage and change (). A. dc voltage b. ac voltage In the pure inductance circuit, the phase relation between voltage and current is (). A. Voltage hysteresis current B The pressure in the hydraulic system depends on (). A. balance valve B. External load The rated pressure of the hydraulic pump shall be the maximum working pressure of the actuator in the system. A. Lower than The characteristic of the type 34O sealing ring is (). A. The structure is simple, the seal is reliable, and the friction force is small. The larger the oil pressure, the better the sealing performance The actuator of the hydraulic system is (). A. Hydraulic cylinder or hydraulic motor B. Hydraulic pump The characteristics of the 36 plunger pump are (). A. high efficiency, high pressure b. high output pressure, but low flow 37 the characteristics of external gear pump are (). A. The noise is small, the oil content is even. The noise is large and the output oil is not uniform 38 the characteristics of the meshing gear pump are (). A. The noise is small, the oil content is even. The noise is large and the output oil is not uniform The type of hydraulic cylinder used in the longer - time of 39 cylinder is (). A. Piston type B. Plunger type When the hydraulic machinery is moving, the sudden impact of moving parts is usually (). A. the oil is mixed with air b. normal phenomenon will then be eliminated by itself Three short answer What is the function of mechanical transmission? What are the parts of the mechanical transmission? What are the characteristics of gear transmission? What are the components of hydraulic transmission system? What are the advantages and disadvantages of hydraulic transmission? How many types of hydraulic pump are there? Describe the function of hydraulic cylinder and hydraulic motor. How many types of hydraulic control valve? What are the roles? Describe the function and classification of hydraulic excavators. What should I pay attention to when I use the battery? What are the overall structure of hydraulic excavators? The composition of the hydraulic excavator backhoe device is briefly described. The composition of the combined arm of hydraulic excavator is described. The composition of hydraulic excavator walking device is briefly described. The type and application scope of the crawler board of hydraulic excavator are briefly described. What is the purpose of hydraulic excavator grinding? How do hydraulic excavators carry out proper walking? How does the hydraulic excavator make the steering operation? What should the hydraulic excavators do when they walk and when they go up the ramp? When the diesel engine is running at high speed or high load, what harm can it do immediately? Describe the method of digging hydraulic excavator. What should the hydraulic excavator rotary operation pay attention to? How to operate hydraulic excavator water operation? What should be done before the broken hammer work? What should be paid attention to in the work of crushing hammer? What is the use requirement of the friction of the brake? What is the role of the relay? What are the "three unsparing" principles for accidents? How to find out the malfunctioning nozzle? 30 test the function and work characteristics of the weight wheel and the performance requirements.