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Instrumentation Questions For You

PLC Pump Permissive Interlocks

S Bharadwaj Reddy
The following PLC program was written to control the operation of a large electric motor-driven pump. A variety of “permissive” inputs protect the pump from damage under abnormal conditions, and...

PLC Electric Motor Interlocks

S Bharadwaj Reddy
Programmable Logic Controller Questions and Answers The following PLC program was written to control the operation of a large electric motor-driven pump. A variety of “permissive” inputs protect the pump...

PLC Programming Questions & Answers – 5

S Bharadwaj Reddy
A engineer needs to write a PLC program to control a water pump driven by an electric motor. This water pump will be manually started and stopped by pushbutton switches,...

PLC Programming Questions & Answers – 4

S Bharadwaj Reddy
A engineer needs to write a PLC program to control a water pump driven by an electric motor. This water pump will be manually started and stopped by pushbutton switches,...

PLC Programming Questions & Answers – 3

S Bharadwaj Reddy
A PLC has been programming to control the starting and stopping of a three-phase electric motor. The program is supposed to require that the operator press and hold the “Start”...

PLC Programming Questions & Answers – 2

S Bharadwaj Reddy
A PLC has been programming to control the starting and stopping of a three-phase electric motor. Shown here is a partial wiring diagram and offline PLC program display for the...

PLC Programming Questions & Answers – 1

S Bharadwaj Reddy
A PLC has been programming to control the starting and stopping of a three-phase electric motor. Shown here is a partial wiring diagram and offline PLC program display for the...

Solenoid Valves Questions & Answers – 6

S Bharadwaj Reddy
This fluid diagram shows the components and connections of a Bettis self-contained hydraulic module used to automatically shut off a “line valve” on a natural gas pipeline in the event...

Solenoid Valves Questions & Answers – 5

S Bharadwaj Reddy
Sketch arrows next to each of the two solenoid valves showing the directions of air flow in the energized (E) and de-energized (D) states, assuming the process control valve is...

Solenoid Valves Questions & Answers – 4

S Bharadwaj Reddy
Sketch arrows next to each of the two solenoid valves showing the directions of air flow in the energized (E) and de-energized (D) states, assuming both of the solenoid valves...

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