21) On a 3"
Fresnel or "Inkie" they origionally used single contact bayonet lug lamp bases (BA-15s) but now use dual contact bayonet (BA-15d) bases. Why would a old single contact bayonet lamp in a new double contact lamp
base explode, but a double contact lamp in an old single contact
base not do anything?
46) What two reasons make it necessary to
ground a
transformer?
53) What is the difference between a generator/alternator, and dynamo?
55) What is the only equipment which can be installed before the service disconnecting means?
58) Define Dirty
Power and the three causes of it.
60) What piece of equipment is designed to do the following: 1) during normal operations, not interfere with the circuits they protect, 2) transfer the excess
voltage to
ground in a surge, not to exceed the
voltage rating of the equipment it protects, 3) Clamping speed must be fast enough to prevent damage to the protected equipment, and 4) be capable of withstanding surges without damage to itself.
61) What are the two purposes of grounding?
62)
Power relays are required for lighting booths when what condition exists?
63) A small
voltage imbalance will produce a proportional or large
current imbalance?
64) A simple inductive
ballast is what?
70) Which is the proper way (most accurate way) of determining
power requirements, A) figure out how many thousands of watts of watts is the total load on the
system, and divide by 1,000 than times that figure by 8.3, multiply that figure by 1.2 for
safety and divide that figure by 3 for the phases, or B) distribute the load, take total wattage of each
leg, divide by 120 to get the amperage, multiply by 1.2 for a
safety factor, and round up to the next size service available for the load?
76) The
unit of electrical pressure is called the what?
77) The
ampere is a
unit of electrical what?
79) The drier the area around a grounding rod, the higher or lower the resistance to
ground?
80) Over-loaded fuses will have a
clear or darkened window?
81) One Hz is the A) amount of time between center of two peaks of
current B) the amount of peaks in 60 seconds C) the amount of peaks+valleys
in one second D) the amount of time between the centers of one peak and one valley of a wave?
91) Causes of high
voltage drop are: excessively long cable runs, poor connections, and what?
103) The resistance of a
conductor is directly proportional to its what?
104) The resistance of a
conductor is inversely proportional to what?
105) Does temperature affect resistance of conductors, if so, would higher
color temperature lamps be higher wattage at the end of their lamp life, or does wattage always stay the same in a lamp in-spite of the age of a lamp? What does this have to do with superconductivity?
107) What is the skin
effect, and what does it have to do with
voltage loss and capacity?
108) What is the difference in resistance between series and parallel?
109) The total resistance of the combined resistances in this
circuit is always less than the resistance of the lowest-value
resistor in this
circuit. The combined total resistance of a number of unequal resistances in this
circuit is equal to the reciprical of the sum of the reciprocals of the individual resistances. What type of
circuit is this, Series or Parallel?
110)
Voltage drop in this type of
circuit equals the sum of the
voltage drops of the resistors in the
circuit, and thin turn equals the
voltage at the supply source. Also the
current in this
circuit is the same throughout the
circuit. What type of
circuit is this?
111) Explain the
effect of induced
emf.
117) What is the difference between electricity and magnetism?
