Most motor circuits are protected by ____.
a. instantaneous-trip circuit breakers or inverse-time circuit breakers
b. instantaneous-trip circuit breakers
c. dual-element time-delay fuses or inverse-time circuit breaker
s
d. non-time delay fuses
c. dual-element time-delay fuses or inverse-time circuit breaker
s
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Output bounding
A) can limit both positive and negative outputs B) uses zener diodes C) is a process of limiting the output range of an amplifier D) all the above
Precision measuring instruments require which of the following care and handling for proper use?
a. Use your senses of sight and touch, which are critical for accurate and consistent measurements. b. Practice using precision measuring instruments to learn their proper feel. c. Never force or overadjust the tools when making measurements. d. All of the above are correct.
The level switch tells you when the _____.
a. vessel is level b. liquid level is empty c. liquid level is at a certain point d. vessel is not level
A conductive heat transfer of 15 W is applied to a metal bar whose length is 0.50- m. The hot end of the bar is at 80oC. Determine the temperature at the other end of the bar for (a) a copper bar (? = 401 W/m-K) with a cross-sectional area of 0.0005 m2, (b) a copper bar (? = 401 W/m-K) with a cross-sectional area of 0.005 m2, and (c) a zinc bar (? = 116 W/m-K) with a cross-sectional area of 0.005 m2.
Given: Q?cond=150 W; ?x = 0.50 m; T1 = 80°C What will be an ideal response?