The most common way to remove bearings is to use _____
a. a bearing puller
b. the hydraulic removal method
c. a press
d. a cutting torch
a
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Answer the following statement(s) true (T) or false (F)
1. A DC motor is reversed by reversing the shunt field current. 2. In a DC reversing motor, the forward and reverse buttons are mechanically interlocked so that it is not possible to operate these buttons at the same time. 3. In a CEMF controller, braking action increases as the armature speed decreases. 4. When using the CEMF controller and dynamic braking, a field discharge resistor must be added. 5. A field discharge resistor is a thyristor-type device that conducts when the voltage across it is high enough, but has a high resistance to normal line voltage.
Air in the brake hydraulic system can cause all of these EXCEPT ________
A) Spongy brake pedal B) May require the driver to "pump up" the brakes before they will stop the vehicle C) Lower than normal brake pedal D) Hard brake pedal
Light quality is described by its duration
Indicate whether the statement is true or false
The number of British thermal units that are changed into useful work is 1,700. The number supplied is 4,300 Btu. What is the thermal efficiency to the nearest whole percent?
A. 30% B. 35% C. 40% D. 45%