Explain how an automatic transmission changes gears.
What will be an ideal response?
To shift a machine equipped with an automatic transmission control valves allow engine oil to flow in and out of respective clutch packs to engage and disengage transmission. Gears are changed automatically by the ECM.
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The motor is used in a drilling operation. When the armature voltage of the loaded motor is 200 V, the motor speed is 500 rpm. Calculate the following:
A dc, separately excited motor has the following ratings: Armature voltage = 200 V Field Constant (K?) = 3 Vs Armature resistance = 1 ? a. Armature current when the motor speed is 500 rpm b. Load torque when the motor speed is 500 rpm c. Motor speed when the armature voltage is reduced by 10% d. Armature current at the condition described in (c)
The vacuum level on a system being evacuated pulls down to 2,000 microns, but goes no lower even as the vacuum pump continues to run. This indicates:
A) That the system is charged with the wrong type of refrigerant. B) That the vacuum is complete. C) The presence of water in the system. D) That the refrigeration oil is incompatible with the refrigerant in the system.
Light-fixture schedules typically provide fixture symbol, manufacturer's name, type, color, bulb, wattage, and remarks columns.
Answer the following statement true (T) or false (F)
Gaskets are used to _____.
A. lubricate ball bearings B. retain lubricants or seal a chamber C. buffer moving components D. support axial and radial loads