# TUNE YOUR LOOP: Mathematics for Instrumentation Technicians

TUNE YOUR LOOP: Questions to keep you sharp.

Tune Your Loop is a series of posts consisting of questions from ISA Training Courses.

1. Your bank called that you have a shortage of \$10 in your account and you know
that you have written another \$20 worth of checks that had not been withdrawn
from your account, but just now you deposited \$50 in the bank. There is a
charge of \$20 for the overdrawn checks what would your balance be when all
checks have cleared?

1. \$50
2. \$0
3. \$30
4. \$100

2. You have a speed sensor on a gear train that has a ratio of 300 to 10. The input
shaft is rotating at 1725 RPM what RPM is the output gear turning at?

1. 57.5
2. 51750
3. 56.7
4. 5.75

3. Using Ohm’s law (E=IxR)compute the current flow in the circuit if the circuit
consists of two 100 resistors in parallel with a 25 volt AC power source.

1. .125 Amps
2. 5 Amps
3. .5 Amps
4. .5 Milli Amps

1. b

2. a

3. c

From the ISA Course Mathematics for Instrumentation Technicians (FG02) pre-instructional survey.

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