ISA Certified Control Systems Technician (CCST) program

CCST

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.

CCST question

What is the value of a resistor that is color coded: green – brown – orange – gold? 

A. 51 K ohms ± 5%
B. 80 K ohms ± 5%
C. 51 ohms ± 10%
D. 503 ohms ± 10%

CCST Answer

The correct answer is A, The correct answer is A, 51 K ohms ± 5%. The four-color band coding is:
 Color  Value   Multiplier 
 Black  0  1
 Brown  1  10
 Red  2  100
 Orange   3  1000
 Yellow  4  10 K
 Green  5  100K
 Blue  6  1 M
 Violet  7  10 M
 Gray  8  
 White  9  
 Gold  ± 5%  0.1
 Silver  ± 10%  0.01

So a resistor with four bands,
green-brown-orange-gold, has a value of:  5             1       x 1000        ± 5%
Or 51 KΩ.

Reference: Goettsche, L.D. (Editor), Maintenance of Instruments and Systems, Second Edition, ISA, 2005.

 

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