Semester Final

Question 1

5 major losses in a motor

Answer 1

1. resistance loss
2. Core Loss
3. Bearing Loss
4. Windage loss
5. Sound loss

Question 2

Four primary sources of power losses in the core of an electric motor.

Answer 2

1. Eddy Current
2. Hysteresis
3. Saturation
4. Flux Linkage

Question 3

Three Requirements for Induction

Answer 3

1. Relative motion
2. A conductor
3. a magnetic field

Question 4

Four Common methods of reduced voltage starting

Answer 4

1. Primary Resistor
2. Autotransformer
3. Part winding
4. Wye-delta

Question 5

The primary difference between single phase and three phase motors is the_____

Answer 5

Start winding

Question 6

Capacitor Motors are mainly used on ______.

Answer 6

Fairly hard-to-start loads.

Question 7

3 different types of control utilized in a wound rotor motor

Answer 7

1. Drum Switches
2. Three pole rheostat
3. Silicone controlled Rectifiers

Question 8

List the Four Limit Switch Actuators

Answer 8

1. Lever
2. Fork Lever
3. Push Roller
4. Wobblestick

Question 9

The Three Basic Parts of an AC Solenoid

Answer 9

1. Plunger
2. Housing
3. Coil

Question 10

What are Three Basic types of overload relays

Answer 10

1. Melting Alloy
2. Magnetic
3. Bimetallic

Question 11

What are two types of thermal overload relays

Answer 11

1. Melting Alloys

2. Bimetallic strip

Question 12

Level Devices are commonly referred to as ______ switches.

Answer 12

Float

Question 13

Magnetic lines of flux surround a conductor as a direct result of the _____ running through the conductor.

Answer 13

Current

Question 14

The three rules for reading a schematic

Answer 14

1. Left to right, top to bottom
2. All components are drawn in a deenergized state
3. No more than one load per rung

Question 15

4 Components of an electric circuit

Answer 15

1. Source
2. Load
3. Path
4. Switch

Question 16

List three basic methods that times use to control timing

Answer 16

1. Dashpot
2. Synchronous
3. Solid State (programmable)

Question 17

The number of closed contact positions per pole

Answer 17

Throw

Question 18

A number of completely isolated circuits a relay can switch at one time

Answer 18

Pole

Question 19

The number of separate places on a contact that open or close an electric circuit

Answer 19

Break

Question 20

The number of separate places on a contact that open or close an electric circuit

Answer 20

Break

Question 21

What are the four types of timing functions that electronic timers are capable of?

Answer 21

1. On-Delay (Timed Closed)
2. On-Delay (Timed Open)
3. Off-Delay (Timed Closed)
4. Off-Delay (Timed Open)

Question 22

4 types of Hall-Effect sensor actuation

Answer 22

1. Hand-on
2. Slide-by
3. Pendulum
4. Vane

Question 23

List 3 advantages of operational amplifiers

Answer 23

1. High Input Impedance
2. Low Output Impedance
3. High Gain

Question 24

7 considerations for selecting a scanning method

Answer 24

1. Position
2. Ambient Light
3. Distance
4. Size
5. Color
6. Ambient Air/environment
7. Relectivity

Question 25

Switches that us NEN transistors to switch the output circuit are ______ devices.

Answer 25

Current sinking

Question 26

Which sensor uses a resistance reading in Ohms to get a temperature reading?

Answer 26

RTD

Question 27

A____ is a device constructed of two dissimilar metals that generates a small current when one end is heated.

Answer 27

Thermocouple

Question 28

_____ scan is a scanning technique that uses a special lens to filter the emitter's beam of light so that it projected on one plane only.

Answer 28

Polarized

Question 29

_____ scan is a scanning technique that places the transmitter and receiver at equal angles from highly reflective surfaces.

Answer 29

Specular

Question 30

_____ scan is a scanning technique used in high vibration applications.

Answer 30

Retroreflective

Question 31

____ scan is a scanning technique generally used in color mark detection.

Answer 31

Diffuse

Question 32

A ____ sensor is a proximity sensor that detects the proximity of a magnetic field.

Answer 32

Hall

Question 33

Flow detection sensor operates on the principle of ______.

Answer 33

Thermal conductivity

Question 34

With a ____ thermistor, an increase in temperature causes the resistance of the thermistor to increase.

Answer 34

PTC (positive temp coefficient)

Question 35

2 reasons for photocell failure

Answer 35

1. contamination | 2. Moisture

Question 36

2 factors that determine the effective range of a capacitive proximity sensor

Answer 36

1. physical characteristics | 2. Electrical characteristics

Question 37

A ____ sensor is a proximity sensor that detects conductive materials.

Answer 37

Inductive

Question 38

Which lead controls or triggers an SCR to conduct?

Answer 38

Gate

Question 39

3 parts of an AC Driver

Answer 39

1. Inverter 2. Converter 3. DC Bus

Question 40

5 parts of an SSR

Answer 40

1. input circuit 2. output circuit 3. Control circuit 4. optocoupler 5. photodiode 6. LED