158. What is a common characteristic of both 3-15 PSI pneumatic and 4-20 mA current loop standards?

A. They both use digital signals

B. They both have a high voltage range

C. They both can transmit data wirelessly

159. What do the "zero" and "span" adjustments on a pressure transmitter allow you to do?

A. Set the instrument for any desired range within its operational limits.

B. Fine-tune the accuracy of the calibration at specific points

C. Reset the instrument to its factory default settings.

D. Compensate for drift in the instrument's performance over time.

160. How does a zero shift calibration error affect the instrument's response?

B. It shifts the entire response curve vertically.

A. It changes the slope of the response curve

C. It introduces a non-linearity in the output signal

D. It amplifies or attenuates the output signal strength.

161. How can a zero shift calibration error be corrected on a transmitter?

C. By carefully adjusting the "zero" setting.

A. This error cannot be corrected without replacing faulty components.

B. By adjusting the "span" setting to compensate for the vertical shift.

D. By recalibrating the entire instrument across all points

E. How can a zero shift calibration error be corrected on a transmitter?

163. Why is it important to document both the "as found" and "as left" conditions during instrument calibration?

B. To calculate the instrument's drift over time for predictive maintenance

A. To create a history of repairs performed on the instrument.

C. To track changes in the calibration procedure over time.

D. To comply with specific safety regulations

164. Why is a 4-20 mA loop called a "live zero" standard?

B. Because 0% is represented by a non-zero current value

A. Because it has a high safety rating

C. Because it can transmit over long distances

165. How does a loop-powered transmitter differ from a 4-wire transmitter in terms of power supply?

B. It relies on the power from the loop for both operation and signal transmission

A. It generates its own power internally.

C. It uses a separate power supply for the transmitter itself.

D. It requires a higher voltage for operation.

166. Why is a loop-powered transmitter also called a 2-wire transmitter?

C. Because it only requires two wires for both power and signal transmission.

A. Because it can only transmit a 2 mA signal.

B. Because its internal circuitry has only two main components.

D. Because it uses two wires for power and two for signal.

167. Why might a 4-wire transmitter be configurable for both sourcing and sinking operation?

B. To accommodate control systems with varying current requirements.

A. To allow for easier installation in different environments

C. To offer redundancy in case of power supply failure.

D. To adjust the power consumption of the transmitter

168. What is the major disadvantage of using a standard milliammeter to measure loop current?

A. It disrupts the flow of information in the loop

B. It is not accurate for measuring DC currents

C. It requires a high voltage for operation.

D. It is too bulky for field use.

169. How does a clamp-on milliammeter measure current?

C. By detecting the magnetic field around the wire

A. By directly connecting to the circuit wires

B. By using sound waves to measure current flow.

D. By measuring the voltage drop across a resistor

170. What is the purpose of a "test" diode in a 4-20 mA loop?

C. To allow for non-intrusive current measurement.

A. To protect the circuit from overcurrent.

B. To convert the DC current to AC current.

D. To regulate the voltage level in the loop.

171. How does a shunt resistor help measure loop current?

A. By creating a voltage drop proportional to the current

B. By amplifying the current signal for easier measurement.

C. By providing a reference voltage for the voltmeter

D. By allowing the current to bypass the meter.

175. What information can be obtained from the voltage output of a potentiometric position transducer?

D. Angular position of the shaft

177. What is the main reason a signal conditioner is used with a transducer?

D. To convert the electrical signal

A. To change the color of the light

178. Why does an A.C. tachogenerator typically need a rectifier/leveler unit?

B. To convert the AC output to DC

C. To increase the speed measurement range

180. What is the SI unit for angular speed?

D. Revolutions per minute (rpm)

182. What is the most common type of digital speed transducer?

A. LVDT (Linear Variable Differential Transformer)

183. How does a photoelectric transducer with a masked disc measure speed?

A. By counting the pulses generated as light is blocked by holes in the disc

B. By detecting changes in capacitance between the disc and sensor

C. By measuring the voltage induced in a coil by the rotating disc

D. By measuring the intensity of the light passing through the disc

184. What is the primary function of an electromechanical relay?

C. To act as an electrically controlled switch

A. To amplify electrical signals

B. To regulate voltage in a circuit

D. To convert AC voltage to DC voltage

186. What is the purpose of the potentiometer dial on the electronic on-delay relay pictured in the passage?

C. To control the on-delay time of the relay

A. To select between AC or DC input voltage

B. To regulate the current flow through the timing circuit

D. To adjust the voltage rating of the relay coil To select between AC or DC input voltage

188. What is the main advantage of a solid-state relay (SSR) compared to an electromechanical relay?

D. Virtually unlimited cycle life and faster response time

A. Lower cost and simpler design

B. Higher voltage and current ratings

C. Ability to handle both AC and DC currents

189. Why do SSRs tend to generate more heat than similar electromechanical relays when carrying the same current?

B. The semiconducting materials have higher resistance

A. The lack of moving parts increases friction

C. SSRs use less efficient switching mechanisms.

D. SSRs require a heat sink for proper operation.

190. In the provided schematic diagram, the dashed line represents the influence of the:

B. Electromagnet coil on the switch mechanism.

A. High-current power circuit on the relay housing

C. Relay housing on the external environment.

D. Control circuit voltage on the switch contacts.

191. what do the terms “Form-A” and “Form-B” correspond to in relay terminology?

C. Normally open and normally closed contacts,

A. Double-pole and single-pole configurations

B. High-current and low-current contacts

D. The number of throws a relay can handle

192. Which type of relay contact is described as having one moving contact and two stationary contacts it can touch?

D. Single-pole, double-throw (SPDT)

A. Single-pole, single-throw (SPST)

B. Double-pole, single-throw (DPST)

C. Double-pole, double-throw (DPDT)

193. What does the “COM” terminal designation typically represent on an SPDT relay?

D. The moving contact of the switch mechanism

A. A high-voltage connection point

B. The common connection to the electromagnet coil

C. A designation specific to a particular relay brand

194. How does a DPDT relay differ from an SPDT relay in terms of its contact functionality?

A. A DPDT relay offers isolated control of two independent circuits.

B. A DPDT relay has two separate moving contacts

C. There is no functional difference between the two types.

D. A DPDT relay can handle higher current than an SPDT relay.

195. What is the purpose of the commutating diode connected in parallel with a relay coil?

B. To provide a safe path for current dissipation during de-energization

A. To block reverse current flow in the control circuit

C. To increase the magnetic field strength of the coil

D. To regulate the voltage supplied to the coil

197. What is the primary factor determining a relay coil rating?

A. The current required to reliably activate the iron armature

B. The voltage required to overcome the relay’s internal spring tension

C. The maximum current the coil can handle without overheating

D. The voltage drop across the coil when energized

199. The photograph included most likely shows a:

A. Disk valve in partially open position

B. Butterfly valve in closed position

C. DGlobe valve with stem visible

100-150

Authored by ibragim aubekerov

English

1st Grade

Used 4+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

151. What is the purpose of a variable speed drive (VSD)? PHOTO

A. To protect against overload.

B. To reduce starting current peaks.

C. To alter the motor speed by changing the frequency.

D. To control the motor’s torque.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

152. What is the primary function of a load-break switch? PHOTO

A. To provide overload protection

B. To make, carry, and break currents

C. To protect against short circuits

D. To operate as a manual disconnect switch

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

153. How does a fuse protect an electrical circuit? PHOTO

A. By short-circuiting the circuit

B. By increasing the circuit’s resistance

C. By melting when too much current flows

D. By regulating the voltage

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

154. What does an analog electronic signal represent?

A. Digital information

B. A constant voltage

C. A voltage or current proportional to a measurement

D. A binary code

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

155. What is the main advantage of using a loop calibrator for troubleshooting current loops?

A. It is more accurate for measuring very small currents

B. It is more affordable than other measurement tools

C. It can both measure and source current in the loop.

D. It is easier to use than a clamp-on milliammeter.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

156. What is the main purpose of calibration for an instrument?

A. To ensure accurate correspondence between input and output signals

B. To improve the sensitivity of the instrument

C. To diagnose any internal faults in the instrument.

D. To adjust the instrument's range of measurement.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

157. What does "ranging" an instrument involve?

A. Adjusting the instrument's internal components for optimal performance

B. Verifying the instrument's compliance with safety regulations.

C. Setting the zero point of the measurement scale

D. Defining the desired sensitivity to input changes

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