ASC - Analog and Digital Automation

How are analog signals converted to digital signals?

• By

  i. sampling

  ii. quantization

  iii. arithmetic calculation

• By

  i. sampling

  ii. taking values at specific point in time

  iii. code word generation

• By

  i. sampling

  ii. quantization

  iii. code word generation

• By

  i. sampling

  ii. quantization

  iii. algebraic conversion

Which of the following statement best describes the advantages of Digital over Analog Control?

• i. increased relialibity

  ii. simplified control techniques

  iii. no signal loss during analog to digital conversion

  iv. All functions can be programmed

  v. enables remote monitoring of systems and machineries

• i. increased relialibity

  ii. advanced control techniques

  iii. no signal loss during analog to digital conversion

  iv. All functions can be programmed

• i. increased relialibity

  ii. no signal loss during analog to digital conversion

  iii. All functions can be programmed

  iv. enables remote monitoring and control of systems and machineries

• i. increased relialibity

  ii. advanced control techniques

  iii. no signal loss during analog to digital conversion

  iv. All functions can be programmed

  v. enables remote monitoring and control of systems and machineries

What are the key components for process monitoring and control?

• i. Sensors

  ii. Signal Conditioning

  iii. Controllers

  iv. Actuators

  v. Communication Protocol

• i. Sensors

  iii. Controllers

  iv. Actuators

  v. Communication Protocol

• i. Detectors

  ii. Signal Conditioning

  iii. Controllers

  iv. Actuators

  v. Communication Protocol

• i. Sensors

  ii. Signal Conditioning

  iii. Controllers

  v. Communication Protocol

Which of the following describes a Sensor?

• A sensor is a device that senses or detects a signal

• A sensor coverts one form of energy to another

• Sensors are also called transducers

• All of the above

What is an analog signal?

• A signal with a specific value at a specified interval n time

• A signal which values varies over time

• immune to noise and interference

• can be saved and retrieved easily

Analog values from analog sensors are scaled to _______ for processing by the PLC Controller

• 4-20mA

• 0-20mA

• 0-5 Volts DC

• 10-20mA

Which of the following is an advantage of a Resistance Temperature Detector (RTD)

• Low Cost

• Wide measuring range

• Good Linearity in measurements

• All of the above

Inductive proximity sensors can detect

• brass

• aluminium

• iron

• All of the above

what is the signal output produced by a thermocouple when it is subjected to a heat source?

• milliamps

• millivolts

• volts

• pulse

What takes place when an RTD is subjected to heat

• the millivolt output increases

• It's resistance value increases

• the mA current increases

• voltage drop decreases