The potential relay has ________
A) a coil with low resistance and normally closed contacts
B) a coil with high resistance and normally closed contacts
C) a coil with high resistance and normally open contacts
D) a coil with low resistance and normally open contacts
B
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Light quality can alter the growth response of shoots in vitro. What type of light tends to promote shoot proliferation and elongation?
What will be an ideal response?
An SRC is made from adjoining layers of semiconductor material in the _____.
a. PN arrangement b. PNP arrangement c. NPN arrangement d. PNPN arrangement
The first crude tools developed for agricultural purposes were made of wood or:
a. Stone c. Clay b. Metal d. Plastic
An air preheater is a:
a. Cost saving system used to heat the air before it enters the burner b. Device located at the burner tip c. Narrow neck between the convection section and stack d. Type of furnace that heats air before it mixes with fuel at burner