Deck 3: Resistors

Question 1

Resistors with higher resistance values usually have ______________ wattage ratings.

Answer 1

lower

Question 2

Since they are generally used for high-current applications, ______________ resistors are available in wattage ratings from 1 W up to 100 W or more.

Answer 2

wire-wound

Question 3

______________-mount resistors are constructed by depositing a thick carbon film on a ceramic base.

Answer 3

Surface

Question 4

A ______________ resistor is a wire-wound resistor made to burn open easily when the power rating is exceeded.

Question 5

The power or wattage rating of a resistor is determined by

A) color-coded bands
B) its function in a circuit
C) its physical size
D) measuring its resistance

Question 6

A resistor is used to

A) limit current or produce a voltage drop
B) step up current
C) increase voltage
D) amplify signals

Question 7

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

Question 8

In electronic equipment, the resistor most commonly used is the

A) wire-wound
B) film-type
C) carbon-composition
D) carbon

Question 9

What type of resistor is constructed by wrapping resistance wire around an insulating core?

A) Carbon
B) Carbon-composition
C) Film-type
D) Wire-wound

Question 10

What type of resistor is typically used as a precision resistor?

A) Carbon
B) Carbon-composition
C) Film-type
D) Wire-wound

Question 11

What type resistor is formed by spraying a thin film of metal onto a ceramic substrate and then cut in the form of a spiral?

A) Carbon
B) Wire-wound
C) Carbon composition
D) Metal-film

Question 12

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

Question 13

A resistor whose resistance value changes with changes in operating temperature is a

A) thermistor
B) varistor
C) fusible
D) chip

Question 14

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

Question 15

If a resistor is color-coded red, blue, and orange, what is its resistance value?

A) 2500 ohms
B) 2600 ohms
C) 26,000 ohms
D) 260 ohms

Question 16

The amount by which the actual resistance can differ from the color-coded value is the:

A) power rating
B) temperature coefficient
C) tolerance
D) differential resistance

Question 17

A resistor with a single black band around the center of the resistor body has a resistance of

A) one
B) zero
C) 1000
D) infinity

Question 18

The resistance value of a chip resistor is determined from the

A) color-code
B) size of the resistor
C) three digit number printed on the film or body
D) three letters printed on the body

Question 19

Variable resistors can be wire-wound or

A) carbon type
B) metal-film type
C) fusible
D) zero resistance type

Question 20

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

Question 21

A device that is used to provide any one resistance within a wide range of values is a

A) varistor
B) decade box
C) fusible resistor
D) decimal box

Question 22

Rheostats and potentiometers are referred to as

A) amplifiers
B) fixed resistors
C) variable resistors
D) fusible resistors

Question 23

What resistive device is generally used to control relatively large values of current in low-resistance circuits for ac power applications?

A) Fusible resistor
B) Potentiometer
C) Rheostat
D) Zero-ohm resistor

Question 24

Commercial rheostats are typically

A) wire-wound, high wattage resistors
B) wire-wound, low wattage resistors
C) carbon, high wattage resistors
D) metal-film, low wattage resistors

Question 25

The power rating is a property of a resistor that depends on the resistor's

A) color-code
B) size
C) function in a circuit
D) composition

Question 26

For ambient temperatures greater than 70°C, the power rating of a resistor must be

A) increased
B) derated
C) doubled
D) held constant

Question 27

When not used, resistors generally keep their characteristics

A) for about one week
B) for about one year
C) almost indefinitely
D) between one to two years

Question 28

The most common trouble in resistors is

A) an open
B) a short
C) leakage
D) lower than listed tolerance

Question 29

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

Question 30

As measured with an ohmmeter, infinite ohms means

A) an open circuit
B) a shorted circuit
C) low resistance
D) zero resistance

Question 31

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

Question 32

Aging, which is normal resistor heating over a long period of time causes the resistor to exceed its

A) power rating
B) derating factor
C) shelf life
D) tolerance

Question 33

The main function of a resistor is to limit the amount of current or produce a desired drop in voltage.

Question 34

The two main characteristics of a resistor are its resistance in ohms and its tolerance in mhos.

Question 35

A thermistor is a thermally sensitive resistor whose resistance value changes with changes in operating temperature.

Question 36

A resistor that is color-coded red, green, red has a value of 2500 ohms.

Question 37

The amount by which the actual resistance can differ from the color-coded value is the positive temperature coefficient.

Question 38

Zero-ohm resistors are commonly found on printed circuit boards.

Question 39

Variable resistors can be wire-wound or carbon type.

Question 40

A decade resistance box is typically used as a potentiometer.

Question 41

A rheostat has two terminals and a potentiometer has three terminals.

Question 42

A potentiometer can never be wired as a rheostat.

Question 43

Wire-wound resistors are larger and have higher wattage ratings than carbon resistors.

Question 44

Resistors have a relatively short shelf life and only keep their characteristics for six to eight months.

Question 45

The most common trouble in resistors is an open.

Question 46

When checking resistance in a circuit, it is important to be sure there are no parallel resistance paths.