- OP
- Abbreviation for Open enclosure -- a type of electric motor housing.
- OPEC
- Acronym for Organization of the Petroleum Exporting Countries. An intergovernmental organization whose stated objective is to coordinate and unify petroleum policies among member countries. It was created at the Baghdad Conference on September 10-14, 1960, by Iran, Iraq, Kuwait, Saudi Arabia and Venezuela. The five founding members were later joined by nine other members: Qatar (1961); Indonesia (1962); Libya (1962); United Arab Emirates (1967); Algeria (1969); Nigeria (1971); Ecuador (1973-1992, 2007); Gabon (1975-1994) and Angola (2007).
- Open car
- Another name for Convertible
- Open circuit
-
- A circuit in which a wire is broken or disconnected.
- Interrupted electrical circuit which stops flow of electricity.
- In an electric motor it is a defect that causes an interruption in the path through which the electrical current normally flows
- Open circuit voltage
- The voltage at device terminals when no appreciable current is flowing. Also called noload voltage.
- Open-class
- When referring to street-legal sportbikes, open-class designates motorcycle with engines that displace more than 800 cubic inches of volume
- Open cradle frame
- A motorcycle frame without tubes running under the engine. The engine unit bolts into place between the front downtube and the swingarm pivot area as a semi-stressed or stressed member
- Open-deck design
- A design in which there is no metal at the cylinder head joint face between the cylinder walls and the outer block
- Open differential
- Common to all conventional motor vehicles, performing the basic drive axle differential function. Unlike a limited-slip or locked differential, an open differential is unable to compensate for traction distinctions from one side of the vehicle to the other, and will thus spin the wheel with the least available grip.
- Open display case
- Commercial refrigerator designed to maintain its contents at refrigerating temperatures even though the contents are in an open case.
- Open drip-proof enclosure
- An electric motor housing with normal insulation treatment which consists of one
or more dips and bakes of varnish. The insulation system is composed of materials
which will not absorb or retain moisture.
Also see
- Open enclosure
- (OP) An electric motor housing with ventilation openings in the end shields
and/or shell to permit passage of cooling air over and around the windings.
The locations of the openings not restricted. It is for use indoors, in fairly
clean locations.
Also see
- Open end lease
- With an open-end lease, there is still a residual value set at the beginning of the lease. However, if the car is worth less than the residual value at the lease's end, the lessee must pay the difference. In other words, the lessee assumes the risk for depreciation with an open-end lease.
- Open frame
- A Step-through motorcycle/scooter frame
- Opening cam/rocker
- With Desmodromic engines, the cam/rocker responsible for opening the intake or exhaust valve
- Open loop
-
- An operating condition or mode based on programmed instructions and not modified by a feedback system
- A predetermined operating condition not based on exhaust gas conditions.
- Open-loop catalytic converter
- A preset converter which does not use an oxygen-sensor control system and thus operates without feedback. The opposite is Computer-controlled catalytic converter. Certain engine management systems deactivate emission control systems (such as EGR and/or oxygen sensor control) under certain operating conditions (e.g., full-throttle driving); i.e., the electronic control module operates in the open-loop mode
- Open-loop fuel control
-
- A non-feedback mode of operation which a feedback system resorts to when the engine is started while it is still cold. During this period, the oxygen sensor isn't yet able to supply reliable data to the computer for controlling the air/fuel mix ratio because the engine isn't yet warmed up. So mix control is handled by a program stored in computer memory
- System in which the air/fuel mixture is preset by design with no feedback correction signal to optimize fuel metering.
- Open loop mode
- Mode in which the computer operates without feedback from the oxygen sensor while the engine is in the cold running condition
- Open loop system
- A control system which operates by feeding in instructions at the beginning of a process and they are followed to complete the process.
- Open refrigeration unit
- Refrigeration in cabinets (units) without covers or with flexible covers made of plastic or some other material, hung in strips or curtains (fringed material, usually plastic, that push aside like a bead curtain). Flexible covers stop the flow of warm air into the refrigerated space.
- Open system
-
- Term for a crankcase emissions control system which vents to the atmosphere
- An anti-lock brake system in which the brake fluid released from the brakes during an ABS stop is not returned to the brake during the ABS stop but is stored in an accumulator
- Open Top Van
- A cargo body style vehicle with sides but without a permanent top--sometimes has a canvas cover.
- Open type check valve
- A valve, normally open to fluid flow in both directions, which closes when fluid flow in one direction exceeds a predetermined value.
- Open type compressor
- Compressor in which the crankshaft extends through the crankcase and is driven by an outside motor. Commonly called external drive compressor.
- Open Washer
- A washer with one side open so as to be removed or put under a nut without removing the nut.
- Operating Authority
- The entity responsible for a truck being on the road. Regardless of who owns the goods or who is driving the truck, the person or company who owns the truck transporting those goods is the operating authority and is responsible for the goods.
- Operating costs
- The costs of running a vehicle. It includes insurance premiums, tax, depreciation, fuel, oil, maintenance, repairs, etc.; usually expressed in dollars per mile or kilometer
- Operating piston
- A piston in an automatic transmission which causes its respective clutch(es), band, or multi-disc brakes to be applied by converting fluid pressure into mechanical force and movement
- Operating pressure
-
- Actual pressure at which the system works under normal conditions. This pressure may be positive or negative (vacuum).
- Pressure at which a system is operating.
Also see
- Operational test
- A check of temperature, pressure, and other conditions under controlled circumstances to determine whether an air conditioner or some other system is operating optimally
- Opportunity cost
- The cost of what you didn't do. For instance, if you have the cash to buy a car, the opportunity cost of the purchase is the interest lost on the cash you used for the car. One of the often-cited advantages of leasing is that it frees up your money to invest elsewhere.
- Opposite lock
- The act of turning the wheels to avoid a Skid by steering in the opposite direction to which the vehicle is going. If the tail of the vehicle swings out to the left in a skid, you should correct the problem by turning the steering fully to the left. Some people express it by saying, steer in the direction of a rear-wheel skid. Others say, counter steer to straighten out the vehicle. If you have never experienced a skid, you might consider taking a course designed to give you the skill. Otherwise, practice in an unoccupied snow-covered parking lot.
- Opt
- Abbreviation for options or Optional equipment.
- Optional equipment
- Any equipment or feature of a new vehicle which is not included in the basic price and is provided only if the purchaser requests it.
The opposite is Standard equipment
Also see