RECF Mechanical Pre-Test Questions with Verified Solutions

RECF Mechanical Pre-Test Questions with Verified Solutions in order to raise the arm of a roboy, the last of 4 spur gears in a simple gear train must rotate clockwise. in what direction does the input (first) gear turn? counterclockwise a robot has wheels with 4 inch diameter. Each wheel rolls 5 revolutions on a horizontal surface without slipping. how far did the robot travel? 62.8 inches which of the following statements is equivalent of the first law of thermodynamics? energy cannot be created or destroyed one hot day matt's air conditioner broke. he thought of an idea to cool his house by opening his refrigerator. three hours later his house temperature went up by two degrees. why did this happen? the condenser on the refrigerator ran constantly two children are playing on a see-saw. the one on the left weighs 80 lbs and the one on the right weighs 100 lbs. if the child on the left is 3 feet from the pivot, how far must the child from the right be for the see-saw to be balanced? 2.4 ft which of the following types of gears would be found in a parallel shaft gear train? spur gears what type of simple machine is in the nutcracker pictured? second class lever a 12 tooth sprocket and a 36 tooth sprocket are connected by a chain. if the 12 tooth sprocket is rotating clockwise, in whag direction is the 36 tooth sprocket turning? clockwise suppose an automobile travels 5 miles in 20 minutes. what is the average speed of the car in miles per hour? 15 mph if a robot had 5 inch wheels that were spinning at 120 RPM, how fast would the robot be moving? 31.4 in/s in a drivetrain, when the torque increases the _________ will decrease speed in a rack and pinon mechanism, turning the pinion gear will cause the pinion gear to ______________________ move in a straight line a motor is connected to a 12 tooth driver gear which meshes with a 72 tooth gear. the 24 tooth gear is paired with another 12 tooth gear on the same axle, which is in turn meshed with a 36 tooth gear on the output shaft. what is the gear ratio of the compound gear train? 6:1 according to Newton's second law, if the mass of a moving object is doubled, what effect does it have on the acceleration of the object? acceleration would decrease by a factor of 2 what is the mechanical advantage of the nutcracker in the figure, where a = 2 inches and b = 8 inches? 4 hydraulics use _______ to produce mehanical