How many elements occur naturally?
a. 111 c. 91
b. 105 d. 85
C
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A piston compresses two kilograms of air in an insulated cylinder such that the pressure changes from 100 kPa to 1000 kPa. If the initial temperature is 25ºC, the entropy change of the air is nearest:
A) 3.6 kJ/K B) 2.2 kJ/K C) 1.7 kJ/K D) 0.008 kJ/K
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Slag is a good ____________________
Fill in the blank(s) with the appropriate word(s).
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Calculate the true power in a 2A series RL circuit with a 100? resistor
a. 50W b. 200W c. 400W d. 600W
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100 Hz is applied to an eight-pole squirrel-cage motor. What happens to the synchronous speed if the number of poles are reduced to four?
A. It is half. B. It doubles. C. It is one-fourth. D. It is four times greater.
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