Documenting skills is value-add

ISA certification provides an objective, third-party assessment, and confirmation of a person's skills. It gives manufacturing and factory staff the opportunity to differentiate themselves from their peers and gain recognition. InTech covers three certification areas in its monthly Certification department.

ISA Certified Automation Professional (CAP) program

Certified Automation Professionals (CAPs) are responsible for the direction, design, and deployment of systems and equipment for manufacturing and control systems.

The following question comes from the CAP study guide, Performance Domain VI, Operations and Maintenance. Long-term support of the system

CAP question

1. Most AC motors operate on the principle of:  

A. Capacitance  
B. Resistance  
C. Induction  
D. Semi conduction

CAP answer

The correct answer is C, induction.   Most AC motors work on the principle of induction. The motor consists of a rotor (rotating portion) with a laminated iron core containing copper bars in the slots. In addition, the motor contains stator field windings (stationary portion). When AC current applies to the stator, a current propagates in the rotor producing a rotor field polarity that opposes the stator field. Capacitors may serve for starting single-phase motors, but this does not apply to the operational basics of the motor, as capacitance refers to the storage of energy (not a function of a motor). A motor does include resistance, but the operation of the motor rotation is not due to its resistance. Basic motor operation has no relation to semi conduction. Reference: Tomal, Electronic Troubleshooting, McGraw-Hill, 1998.

ISA Certified Control Systems Technician (CCST) program

Certified Control System Technicians (CCSTs) calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables.

This question comes from the Level I study guide, Domain 3, Troubleshooting. Level I represents a professional who has a five-year total of education, training, and/or experience. 

CCST question

1. What is a thermowell?

A. Protective tube
B. Type of manometer
C. Expandable bulb
D. Reservoir

CCST answer

A thermowell is a closed-end tube that surrounds the measuring junction of thermocouple and protects it from physical damage, corrosion, or thermo chemical interaction with the medium whose temperature is the subject of measurement. The correct answer is A.

ISA Certified Industrial Maintenance Mechanic (CIMM) program

Certified Industrial Maintenance Mechanics (CIMMs) are responsible for preventive, predictive, and corrective maintenance. They are multi-skilled individuals whose expertise is primarily mechanical in nature as opposed to instrumentation or electrical.

CIMMs have a minimum of five years of relevant work experience in the maintenance mechanic field or three years experience and a two-year associate degree in maintenance or a related field.

These questions are from Performance Domain I: Maintenance practices

CIMM questions

1. Using what instrument assures a correct measurement with a micrometer?

A. Venier caliper
B. Different micrometer
C. Standard gage block
D. Scale

2. When is it necessary to take a pipe vise out of service?

A. When the pipe vise needs painting
B. When there is rust on moving parts
C. When the vise jaws are broken
D. When the chain needs lubricating

CIMM answers

1. A standard gage block is precise, and its dimensions are accurate. The accuracy of a block must be verified and certified by a NIST-traceable calibration laboratory. A facility will usually require all micrometers and other measuring tools check out against the standard gage block on a regular basis throughout the year. The standard gage block will go to the calibration lab for rechecking at least once a year. The correct answer is C.

Reference: Briney, Home Machinist Handbook, New York, McGraw Hill, 1984.

2. The best answer is C, when the vise jaws are broken. Removing faulty equipment from service to prevent personal injury is imperative. 

Reference: National Joint Steamfitter-Pipefitter Apprenticeship Committee, Use and Care of Tools, Washington, D.C.,  National Joint  Steamfitter-Pipefitter Apprenticeship Committee,1972. 

Nicholas Sheble  (nsheble@isa.org) edits  the Certification department.