____ is the best natural conductor of electricity.
a. Copper
b. Silver
c. Gold
d. Aluminum
b. Silver
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Concrete and steel lintels, which shorten installation time, have now greatly replaced the masonry arch.
Answer the following statement true (T) or false (F)
What is the function of the field discharge resistor?
What will be an ideal response?
The purpose of contactor 2M shown in Figure 3 is to _____.
a. short motor leads T4, T5, and T6 during starting to connect motor windings in a wye configuration b. energize motor leads T1, T2, and T3 for both wye and delta connections c. energize motor leads T4, T5, and T6 during running to connect the motor windings in a delta configuration d. connect resistors in series with the motor windings during the transition from start to run
Why did burghers and merchants in many towns in France, the Netherlands, and Italy set out their rights in charters?
a. to become independent of royal authority b. to insure their relative freedom from noble and church interference c. to weaken the power of guilds and communes d. to slow the influx of peasants migrating from the countryside to the towns