ISA Certified Control Systems Technician (CCST) program

• CCST

Summary

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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