1. All of the following front suspensions are used on cars EXCEPTA. MacPherson strutB. Short - and long - armC. Leaf springD. Double wishbone2. Most cars use a belt driven hydraulic pump to operate theA. Power brake boosterB. Power steering systemC. Electronically controlled suspension systemD. All of these
35 isn't a standard pressure for tires anymore. I've been putting tires that recommend 44 psi on all my cars for several years now. Often tires on SUVs and Pickups recommend 50 to 80. The reason tire pressure affects mileage is because it changes the size of the tire when you're running down the road. Higher pressures can make high speed travel more efficient (like highway) because the car goes farther each time the wheel rotates. Lower pressures can make stop and go driving more efficient because it makes acceleration easier on the engine. I would say it really depends on your driving habits and where you usually drives. Test it and see, just be careful with lower pressures because it can shorten the life of your tires if they are so low the walls stick out.
Yes, use your car manufacturers recommended air pressure (should be 32 to 35 psi). The max pressure on the side wall of the tire should never be used.
adding unnecessary air to your tires will not improve mileage and it's going to affect your driving, you need to deflate them to the factory rating. when you have too much air in a tire, the rubber expands and changes shape slightly. as a result, less tread is touching the road which gives you a loss of grip. as a result, your acceleration, braking, and handling will suffer greatly and it's actually unsafe in an emergency situation. you're getting worse mileage because you have to rev the engine more to achieve when accelerating, setting the tires to the factory specs will solve this problem. as for high performance tires, most of them usually have a softer tread compound to enhance grip. this is the exact opposite of what you want considering they have higher rolling resistance in exchange for better handling and traction. if you're this serious about mpg, find something with a hard compound and low resistance.
1) C 2) B, A as well in the case of a hydra-boost brake booster(it is driven by the power steering system, which is belt driven) Good luck with your exam. Don't get caught!
1 is D. A is very common today. B is very common today. C it was used in the past, not used now. D a double wish-bone is the same as B but both arms are the same length, not used because of stability they must be of an unequal length. 2 is D. all of those could be, and over the years have been, operated with a belt driven pump. Clearly most common use is power steering.
