Answer the following statement(s) true (T) or false (F)
1. Voltage is always measured between three points of different potential.
2. We use an instrument known as a voltmeter to measure voltage.
3. Electron theory defines current flow as a motion of free electrons from the negative pole of a source, through the outer circuit path, and back to the positive pole.
4. In measuring the rate of electron flow, we are concerned with simple speed rather than a quantity rate.
5. Common materials of highest resistance (so high it is difficult even to measure) are the least effective insulators.
1. False
2. True
3. True
4. False
5. False
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Answer the following statement(s) true (T) or false (F)
1. To prevent unauthorized On-Line programming, a key switch is provided, either on the programming device or on the processor, to restrict the access to a monitor-only mode, or to Off-Line and monitor-only mode. 2. Once a program is complete, it should be tested while still in the Off-Line mode. 3. The function or functions of the processor that can be locked out with the key switch or by using passwords are fairly standard and are the same from PLC to PLC. 4. Most PLCs are designed so that any input contact (N.O. or N.C.) or output coil can be Forced On or Off. 5. With a ControlLogix 1756-L62 processor, controllers can be placed in any slot, but it is not possible to place multiple controllers in the same chassis.
_________________________ are swaths of trees, shrubs, or grasses planted along the banks of streams, rivers, wetlands, or lakes
Fill in the blank(s) with correct word
A hard disk is formatted into sections known as tracks and ________
Fill in the blank(s) with correct word
Resistors and a capacitor will produce a duty cycle greater than 50% for a 555 astable multivibrators
Indicate whether the statement is true or false