RST Study

Question 1

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

Answer 1

12.5 Ohms

1 / ( 1/25 + 1/25 )

Question 2

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

Answer 2

5 Volts

Question 3

What does TTL stand for?

Answer 3

Transistor-Transistor Logic

Question 4

What is capacitance measured in?

Answer 4

Farads

Question 5

What is Inductance measured in?

Answer 5

Henries

Question 6

What is Impedance measured in?

Answer 6

Ohms

Question 7

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

Answer 7

Approximately 0.7V

Question 8

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

Answer 8

2

Question 9

The brushes on a DC motor contact the ?

Answer 9

Commutator

Question 10

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

Answer 10

Deadband

Question 11

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?

Answer 11

277V

Question 12

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?

Answer 12

120V

Question 13

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

Answer 13

Approximately 340V

Question 14

How much does a capacitor charge after one time constant?

Answer 14

Approximately 63.2%

Question 15

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

Answer 15

Voltage Regulation

Question 16

What is the difference between a contactor and motor starter?

Answer 16

A motor starter has overloads

Question 17

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

Answer 17

Delay On Energize

Question 18

What do overloads primarily protect against?

Answer 18

Overheating from excessive current

Question 19

DRAM stores data on ?

Answer 19

Capacitors

Question 20

What is the equation for gain?

Answer 20

Gain = output/input

Question 21

A “megger” measures ?

Answer 21

Resistance

Question 22

What are the three types of PLC counters?

Answer 22

Up, Down, Up-Down

Question 23

How many leads on a BJT?

Answer 23

3 (Collector, Base, Emitter)

Question 24

What does BJT stand for?

Answer 24

Bipolar Junction Transistor

Question 25

What are the 3 ways instrumentation valves are controlled?

Answer 25

Electronic (most common) Hydraulic Pneumatic

Question 26

What is the range of audible frequency?

Answer 26

About 20 Hz to 20 kHz

Question 27

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

Answer 27

Cathode

Question 28

What two factors determine a motor's RPM?

Answer 28

Frequency and the number of poles. RPM = (Hz*60*2)/ #of poles

Question 29

What is the forward bias voltage of a Germanium diode?

Answer 29

0.3V

Question 30

In hydraulic servo valves, DITHER is used to improve ?

Answer 30

Response Time

Question 31

What are D-Flip Flops used for?

Answer 31

Data latching

Question 32

In a diode, Current flows from ? to ?

Answer 32

Cathode to Anode

Question 33

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

Answer 33

N-Type - excess of electrons P-Type - Excess of "Holes"

Question 34

A ? diode is generally used in high frequency operations.

Answer 34

Schottky

Question 35

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

Answer 35

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

Question 36

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

Answer 36

Thermistor

Question 37

What are the three basic parts of a VFD?

Answer 37

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

Question 38

The rate of capacitor charge/discharge is ?

Answer 38

Exponential

Question 39

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

Answer 39

5

Question 40

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

Answer 40

Most effective (100% signal) Least efficient

Question 41

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

Answer 41

Least Effective Most Efficient

Question 42

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

Answer 42

Oscilloscope

Question 43

What are the three leads of a MOSFET?

Answer 43

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

Question 44

What are the three leads of a Triac?

Answer 44

Anode 1 (MT1) Gate Anode 2 (MT2)

Question 45

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

Answer 45

Yellow, Violet, Red

Question 46

What is the show lighting standard protocol?

Answer 46

DMX-512

Question 47

What is a PID?

Answer 47

Proportional Integral Derivative Controller

Question 48

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

Answer 48

TTL and CMOS

Question 49

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

Answer 49

4 - 20mA

Question 50

? is the basic function of all amplifiers

Answer 50

Gain

Question 51

What does XIC stand for?

Answer 51

Examine If Closed

Question 52

What does XIO stand for?

Answer 52

Examine If Open

Question 53

What does DODE stand for?

Answer 53

Delay On De-Energize

Question 54

What is an RTD sensor?

Answer 54

Resistance Temperature Detector

Question 55

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

Answer 55

Matched

Question 56

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

Answer 56

The square root of 3

Question 57

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

Answer 57

Analog

Question 58

SRAM (Static RAM) refers to a ?

Answer 58

Flip-Flop

Question 59

What are the two types of PLCs?

Answer 59

Fixed and Modular

Question 60

Zener diodes are used in ? applications

Answer 60

voltage regulation

Question 61

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

Answer 61

Triac - Full Wave SCR - Half Wave

Question 62

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

Answer 62

Fuses protect wire Overloads protect motor