Bus contention arises when more than one register output is "enabled" at the same time on a single data bus line. This condition will cause:
A) uncertain logic levels and possible damage to the input data lines of the registers contending for the bus.
B) uncertain logic levels and possible damage to the bus line.
C) uncertain logic levels and possible damage to the register output buffers.
C
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In the consequent pole motor, if the number of poles is doubled, the motor speed will be _____.
A. stay the same B. cut in half C. double D. go to zero
Answer the following statement(s) true (T) or false (F)
1. Ladder logic is a good choice for a programming language because it closely resembles the way circuits are hard-wired. 2. The EXAMINE OFF instruction is only logically true when the device referenced is ON, or open. 3. When the N.C. symbol is programmed in a ladder diagram, any address that is actually ON becomes logically true and power can flow. 4. The number of times an input device can be addressed and used in a programmed circuit is limited to eight. 5. There are many more applications and circuits that normally require two- or three-pole devices that now only require single-pole devices when programmed for a PLC.
What part does NOT rotate when the engine is running and the clutch is depressed?
A) Flywheel B) Input shaft C) Pressure plate D) Pilot bearing (bushing)
Absorption current consists of polarization current and _____.
a. electron current b. valence drift c. electron drift d. dielectric current