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RST Study > RST Study > Flashcards

RST Study Flashcards

1
Q

What is the total resistance of a circuit with two 25 ohm resistors in parallel?

A

12.5 Ohms

1 / ( 1/25 + 1/25 )

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2
Q

What is the standard High output voltage for a TTL circuit?

A

5 Volts

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3
Q

What does TTL stand for?

A

Transistor-Transistor Logic

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4
Q

What is capacitance measured in?

A

Farads

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5
Q

What is Inductance measured in?

A

Henries

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6
Q

What is Impedance measured in?

A

Ohms

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7
Q

In FORWARD Bias, a silicone diode will start conducting when what voltage is applied?

A

Approximately 0.7V

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8
Q

An increase of 3dB will amplify an audio signal ? times?

A

2

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9
Q

The brushes on a DC motor contact the ?

A

Commutator

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10
Q

When an instrument receives a small change in input, but registers no change in output, this type of error is called ?

A

Deadband

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11
Q

A 3-phase xfmr has a delta primary and wye connected secondary. If the secondary voltage is 480V phase to phase, what is it phase to neutral?

A

277V

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12
Q

A 3-phase xfmr has a delta primary and wye connected secondary. If the secondary voltage is 208V phase to phase, what is it phase to neutral?

A

120V

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13
Q

What is the Peak to Peak voltage of 120V RMS?

A

Approximately 340V

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14
Q

How much does a capacitor charge after one time constant?

A

Approximately 63.2%

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15
Q

What is the primary use of a Zener Diode in reverse bias?

A

Voltage Regulation

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16
Q

What is the difference between a contactor and motor starter?

A

A motor starter has overloads

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17
Q

What does DOE stand for? (In reference to timers)

A

Delay On Energize

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18
Q

What do overloads primarily protect against?

A

Overheating from excessive current

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19
Q

DRAM stores data on ?

A

Capacitors

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20
Q

What is the equation for gain?

A

Gain = output/input

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21
Q

A “megger” measures ?

A

Resistance

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22
Q

What are the three types of PLC counters?

A

Up, Down, Up-Down

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23
Q

How many leads on a BJT?

A

3 (Collector, Base, Emitter)

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24
Q

What does BJT stand for?

A

Bipolar Junction Transistor

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25
Q

What are the 3 ways instrumentation valves are controlled?

A

Electronic (most common)
Hydraulic
Pneumatic

26
Q

What is the range of audible frequency?

A

About 20 Hz to 20 kHz

27
Q

Which side of a diode is generally marked by a silver band?

A

Cathode

28
Q

What two factors determine a motor’s RPM?

A

Frequency and the number of poles.
RPM = (Hz602)/ #of poles

29
Q

What is the forward bias voltage of a Germanium diode?

A

0.3V

30
Q

In hydraulic servo valves, DITHER is used to improve ?

A

Response Time

31
Q

What are D-Flip Flops used for?

A

Data latching

32
Q

In a diode, Current flows from ? to ?

A

Cathode to Anode

33
Q

? Type Semiconductors have an excess of electrons, while ? Type have a deficiency of electrons?

A

N-Type - excess of electrons
P-Type - Excess of “Holes”

34
Q

A ? diode is generally used in high frequency operations.

A

Schottky

35
Q

How many diodes are utilized in half-wave? full-wave? and bridge? rectifiers?

A

Half-wave - 1
Full-wave - 2
Bridge - 4

36
Q

A ? is a resistor that changes its resistance when the temperature changes.

A

Thermistor

37
Q

What are the three basic parts of a VFD?

A

Converter (AC-DC) , DC Filter, Inverter (DC-AC)

38
Q

The rate of capacitor charge/discharge is ?

A

Exponential

39
Q

How many time constants does it take to charge a capacitor?

A

5

40
Q

A class A amplifier is the ? effective and the ? efficient.

A

Most effective (100% signal)
Least efficient

41
Q

A class C amplifier is the ? effective an the ? efficient

A

Least Effective
Most Efficient

42
Q

A(n) ? is an instrument that provides a visual display of a waveform.

A

Oscilloscope

43
Q

What are the three leads of a MOSFET?

A

Drain
Gate
Source
(Top to bottom, same order on schematic drawing)

44
Q

What are the three leads of a Triac?

A

Anode 1 (MT1)
Gate
Anode 2 (MT2)

45
Q

What are the color bands, in order, for a 4.7k ohm resistor?

A

Yellow, Violet, Red

46
Q

What is the show lighting standard protocol?

A

DMX-512

47
Q

What is a PID?

A

Proportional Integral Derivative Controller

48
Q

What is the most common type of Integrated Circuit used today?

A

TTL and CMOS

49
Q

A measurement device that transmits an analog signal has a typical range of ?

A

4 - 20mA

50
Q

? is the basic function of all amplifiers

A

Gain

51
Q

What does XIC stand for?

A

Examine If Closed

52
Q

What does XIO stand for?

A

Examine If Open

53
Q

What does DODE stand for?

A

Delay On De-Energize

54
Q

What is an RTD sensor?

A

Resistance Temperature Detector

55
Q

The best power transfer is when the impedance of the signal and the load are ?

A

Matched

56
Q

In a Delta setup, phase CURRENT is multiplied by ? to get line current

A

The square root of 3

57
Q

A graph showing continuous values over time is a(n) ? representation.

A

Analog

58
Q

SRAM (Static RAM) refers to a ?

A

Flip-Flop

59
Q

What are the two types of PLCs?

A

Fixed and Modular

60
Q

Zener diodes are used in ? applications

A

voltage regulation

61
Q

Triacs are ?-wave devices, while SCRs are ?-wave devices

A

Triac - Full Wave
SCR - Half Wave

62
Q

In reference to motors, fuses protect the ? while overloads protect the ?

A

Fuses protect wire
Overloads protect motor

RST Study (6 decks)

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