____ anchors have an unthreaded hole into which a wood or sheet metal screw is driven.
a.Hammer drive
b.Aluminum drive
c.Nylon nail
d.Lead
ANS: D
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The difference between rotor speed and synchronous speed is called ____________________.
Fill in the blank(s) with the appropriate word(s).
When the war with Mexico began, President James K. Polk
A. advocated taking all of Mexico. B. believed the British would intervene on behalf of the Americans. C. hoped to fight a limited war, ending with the conquest of California. D. supported a large-scale conflict. E. denied any intention of expanding slavery.
This plant nutrient was discovered when farmers noticed that ashes from wood fires caused plants to grow better
It became known as potash as a result of that discovery. What is it?
What will be an ideal response?Answer the following statement(s) true (T) or false (F)
1. The silicon-controlled rectifier (SCR) is made by joining four layers of semiconductor material together. 2. The SCR is a rectifier. 3. If the SCR is to control all of the positive waveform, it must be phase shifted. 4. To test an SCR, connect the negative output lead of the ohmmeter to the anode and the positive lead to the cathode. 5. One disadvantage of the GTO over a common SCR is its inability to control power in a direct current circuit.