Which is NOT one of the possible reasons crops were first domesticated?
a. Climate changes resulted in favorable growing conditions.
b. Technology developed to cultivate large quantities of grain.
c. Human populations were becoming increasingly sedentary.
d. Many animal species became extinct.
D
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What is the true power in a 2A series RL circuit with a 100? resistor?
a. 50W b. 200W c. 400W d. 600W
When an animal is genetically programmed to respond to either an increase or decrease in daylength, it is called ____________________
Fill in the blank(s) with correct word
Reel mowers:
A) have a chopping-like action. B) are easier to maintain than rotary mowers. C) are preferred for high quality cuts. D) require more power than rotary mowers.
separately excited, dc motor has the following name plate ratings:
Terminal voltage = 400 V Speed = 1250 rpm Developed torque at full load = 90 Nm Full-load armature current = 30 A A single-phase, full-wave, ac/dc converter is connected between a 480 V (rms) ac source and the armature terminals. A fan-type load is connected to the motor. When the triggering angle is adjusted to 40o, the motor speed is 1050 rpm. Calculate the triggering angle required to operate the motor at 1200 rpm. Assume that the armature current is always continuous.