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Introduction to Circuit Protection


Quiz Questions

1.The name “ammeter” comes from the fact that it is a meter used to measure current (in amperes), and thus is called an ampere METER, or AMMETER.
True
False
2. A meter movement converts _____________ energy into ________________ energy.
Electrical to mechanical
Mechanical to electrical
Heat to mechanical
3.A galvanometer is an instrument that measures small amounts of current and is based on the electromagnetic principle.
True
False
4.What is the purpose of a rectifier in a meter?
A rectifier changes alternating current to pulsating direct current and allows a dc meter to measure ac.
A rectifier change pulsating direct current to alternating current and allows an ac meter to measure dc.
None
5.Figure1-14 represents a ________________.
Meter damping system
Voltmeter
Ammeter
6.The two types of circuit protection devices discussed in chapter-2 are ___________ and ___________.
Fuses and circuit breakers
Voltmeters and Ammeters
7.Post-type fuse holders are not made for cartridge fuses.
True
False
8.What are three methods for determining if a fuse is open?
Visual inspection, Indicators & Meters
Voltmeter, Indicators & Meters
9.Unlike a fuse, a circuit breaker is reusable.
True
False
10.Circuit breakers have _______ main components, as shown in figure 2-16.
Five
Four
Three
11.The TRIP ELEMENT is the part of the circuit breaker that senses the overload condition and causes the circuit breaker to trip or break the circuit.
True
False
12.A magnetic trip element circuit breaker uses an electromagnet in series with the circuit load as in figure 2-20.
True
False
13.What type of circuit breaker is used on a multimeter?
Push button
Push-pull circuit breaker
Both of the above
14.PLUG-TYPE FUSES are used in low-voltage, low-current circuits. This type of fuse is rapidly being replaced by the circuit breaker.
True
False
15.___________________ are available in a wide range of physical sizes and voltage and current ratings. This type fuse is the most commonly used fuse.
Cartridge Fuses
Plug type Fuses
16.An_______________ switch is a switch that is controlled by a mechanical or electrical device.
Automatic
Manual
17.Which of the following electrical quantities is measured by a wattmeter?
Power
Energy
Voltage
Current
18.Which of the following electrical quantities is measured by a watt hour meter?
Power
Energy
Voltage
Current
19.The RELAY is a device that acts upon the same fundamental principle as the solenoid.
True
False
20.Circuit Control Devices are used to apply or remove power and to select a function or circuit within a device..
True
False