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4th Year > Semester Final > Flashcards

Semester Final Flashcards

1
Q

5 major losses in a motor

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

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

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

Three Requirements for Induction

A
  1. Relative motion
  2. A conductor
  3. a magnetic field
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4
Q

Four Common methods of reduced voltage starting

A
  1. Primary Resistor
  2. Autotransformer
  3. Part winding
  4. Wye-delta
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5
Q

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

A

Start winding

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6
Q

Capacitor Motors are mainly used on ______.

A

Fairly hard-to-start loads.

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7
Q

3 different types of control utilized in a wound rotor motor

A
  1. Drum Switches
  2. Three pole rheostat
  3. Silicone controlled Rectifiers
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8
Q

List the Four Limit Switch Actuators

A
  1. Lever
  2. Fork Lever
  3. Push Roller
  4. Wobblestick
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9
Q

The Three Basic Parts of an AC Solenoid

A
  1. Plunger
  2. Housing
  3. Coil
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10
Q

What are Three Basic types of overload relays

A
  1. Melting Alloy
  2. Magnetic
  3. Bimetallic
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11
Q

What are two types of thermal overload relays

A
  1. Melting Alloys

2. Bimetallic strip

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12
Q

Level Devices are commonly referred to as ______ switches.

A

Float

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13
Q

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

A

Current

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14
Q

The three rules for reading a schematic

A
  1. Left to right, top to bottom
  2. All components are drawn in a deenergized state
  3. No more than one load per rung
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15
Q

4 Components of an electric circuit

A
  1. Source
  2. Load
  3. Path
  4. Switch
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16
Q

List three basic methods that times use to control timing

A
  1. Dashpot
  2. Synchronous
  3. Solid State (programmable)
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17
Q

The number of closed contact positions per pole

A

Throw

18
Q

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

A

Pole

19
Q

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

A

Break

20
Q

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

A

Break

21
Q

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

A
  1. On-Delay (Timed Closed)
  2. On-Delay (Timed Open)
  3. Off-Delay (Timed Closed)
  4. Off-Delay (Timed Open)
22
Q

4 types of Hall-Effect sensor actuation

A
  1. Hand-on
  2. Slide-by
  3. Pendulum
  4. Vane
23
Q

List 3 advantages of operational amplifiers

A
  1. High Input Impedance
  2. Low Output Impedance
  3. High Gain
24
Q

7 considerations for selecting a scanning method

A
  1. Position
  2. Ambient Light
  3. Distance
  4. Size
  5. Color
  6. Ambient Air/environment
  7. Relectivity
25
Q

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

A

Current sinking

26
Q

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

A

RTD

27
Q

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

A

Thermocouple

28
Q

_____ 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.

A

Polarized

29
Q

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

A

Specular

30
Q

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

A

Retroreflective

31
Q

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

A

Diffuse

32
Q

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

A

Hall

33
Q

Flow detection sensor operates on the principle of ______.

A

Thermal conductivity

34
Q

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

A

PTC (positive temp coefficient)

35
Q

2 reasons for photocell failure

A
  1. contamination

2. Moisture

36
Q

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

A
  1. physical characteristics

2. Electrical characteristics

37
Q

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

A

Inductive

38
Q

Which lead controls or triggers an SCR to conduct?

A

Gate

39
Q

3 parts of an AC Driver

A
  1. Inverter
  2. Converter
  3. DC Bus
40
Q

5 parts of an SSR

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

4th Year (13 decks)

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