Which of the following electrical systems is not required to be grounded?
A. 120-volt, 1-phase, 2-wire
B. 120/240-volt, 1-phase, 3-wire
C. 208Y/120-volt, 3-phase, 4-wire, wye-connected
D. 240-volt, 3-phase, 3-wire, delta-connected
D. 240-volt, 3-phase, 3-wire, delta-connected
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DAC output with random inputs. Consider the following worksheet that shows ten random samples in Column B that have been matched to a b-bit quantizer with ?=1 and b specified in B1. The maximum amplitude that is matched to the quantizer is computed in D1. Column C computes the b-bit code using the Excel formula that converts a numerical value to its quantized b-bit binary value. Column D computes the b-bit DAC level using the Excel formula that converts a binary value to its decimal value.
a. What is the Excel formula in D1?
b. What is the Excel formula in B7?
c. What is the Excel formula in C7?
d. What is the Excel formula in D7?
Answer the following statement(s) true (T) or false (F)
1. The convention for programming examples in the text uses Analog Memory to refer to a word address in a user memory area of the PLC containing a decimal value from calculations or values to be stored for comparison type instructions. 2. A digital address in the output memory area of the PLC that a real-world device is being controlled from, such as a pilot light, motor starter, or solenoid, is referred to as Digital Memory. 3. In most cases, there is more than one solution to a problem. The right solution and subsequent logic depends on having a thorough understanding of the machine or process to be controlled. 4. The accompanying figure shows a memory address labeled as Digital Input connected to the normally closed contact marked “Start Push Button.” 5. When controlling industrial motors with PLCs, it is often desirable to monitor and know when motor starters fail to operate as directed.
The size of the pulleys in a CVT is _____ controlled to select the best overall drive ratio based on throttle position, vehicle speed, and engine speed
A. manually B. automatically C. electronically D. computer
What controls the output frequency of an oscillator using the 555 timer?
What will be an ideal response?