Practice Test (See related pages) 1 The two main characteristics of a resistor are its resistance in ohms and its power rating in watts. A) True B) False 2 Carbon-composition resistors are made of finely divided carbon or graphite mixed with a powdered insulating material. A) True B) False 3 A resistor that is color-coded red, green, orange has a value of 2500 ohms. A) True B) False 4 The amount by which the actual resistance can differ from the color-coded value is the tolerance. A) True B) False 5 Zero-ohm resistors are not commonly found on printed circuit boards. A) True B) False 6 A rheostat has three terminals and a potentiometer has two terminals. A) True B) False 7 A potentiometer can be wired as a rheostat. A) True B) False 8 Carbon resistors are larger and have higher wattage ratings than wire-wound resistors. A) True B) False 9 The most common trouble in resistors is a short. A) True B) False 10 In electronic equipment, the resistor most commonly used is the type. 11 A resistor whose resistance value changes with changes in operating temperature is a . 12 The amount by which the actual resistance can differ from the color-coded value is the . 13 A resistor with a single black band around the center of the resistor body has a resistance of . 14 Variable resistors can be wire-wound or type. 15 A device that is used to provide any one resistance within a wide range of values is a box. 16 Rheostats and potentiometers are referred to as resistors. 17 The power rating is a property of a resistor that depends on the resistor's . 18 Two major characteristics of a resistor are A) resistance in ohms and tolerance in percentage B) resistance in ohms and power rating in watts C) resistance in ohms and conductivity in mhos D) resistance in ohms and power in joules 19 What type of resistor is typically used as a precision resistor? A) carbon B) carbon-composition C) film-type D) wire-wound 20 What is the resistor called that is designed to burn open easily when the power rating is exceeded? A) thermistor B) varistor C) fusible D) chip 21 What type resistor is frequently used in electronic circuits in which it is desired to provide temperature control? A) thermocouple B) thermodynamic C) thermistor D) varistor 22 The way resistance varies with shaft rotation in a variable resistor is called the A) variable of the control B) variance of the control C) rheostat D) taper of the control 23 A variable resistance with two terminals that is connected in series with the load is a A) potentiometer B) rheostat C) tunable transformer D) varistor 24 What is indicated when a volume or tone control makes a scratchy noise as the shaft is rotated? A) shorted resistance element B) open resistance element C) worn or dirty resistance element D) wrong resistance value 25 What may cause a much lower resistance value to be displayed on an ohmmeter when checking resistance in a circuit? A) low batteries in the ohmmeter B) the circuit power is on C) parallel resistance paths D) open resistors
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