True/False
Indicate whether the
statement is true or false.
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1.
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Overload relays are designed to open the circuit when the current becomes 115
percent to 125 percent of the motor full load current.
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2.
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Thermal overload relays trip faster when located in a cool area than in a warm
area.
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3.
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Many bimetal strip type overload relays can be set for either manual or
automatic reset.
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4.
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Magnetic type overload relays are sensitive to ambient temperature.
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5.
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One common use for the normally open set of contacts on an overload relay is to
provide an input signal to a programmable logic controller (PLC).
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Completion
Complete each
statement.
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6.
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Fuses and ____________________ are designed to protect the circuit from a direct
ground or short-circuit condition.
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7.
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Motor starting current is referred to as ____________________ current.
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8.
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Fuses which are intended to provide both short circuit protection and overload
protection are called ____________________ time delay fuses.
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9.
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Solder melting type overloads are often called solder ____________________
overloads.
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10.
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Magnetic overload relays can be divided into two major types: electronic and
____________________.
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Short Answer
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11.
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Overload relays are divided into two separate sections. What are the two
sections?
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12.
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What are the two types of thermal overloads?
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13.
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How do magnetic type overload relays operate?
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14.
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What are the elements of a single pole double throw switch arrangement?
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15.
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What does it mean for a current transformer to have a ratio of 150:5?
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