When CMOS logic circuits are driving TTL logic circuits, any current mismatch problems can usually be overcome by the addition of:
A) a TTL tri-state inverting buffer between the stages.
B) a CMOS inverting bilateral switch between the stages.
C) a TTL tri-state noninverting buffer between the stages.
D) a CMOS noninverting bilateral switch between the stages.
C
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The ____________________ is determined by the number of teeth on the driving gear compared to the number of teeth on the driven gear.
Fill in the blank(s) with the appropriate word(s).
Technician A says that however thoroughly a pre-delivery inspection (PDI) has been performed, there is always a chance that something has been missed. Technician B says that a post-break-in check up after a new or reconditioned engine has run its first 1,000 linehaul miles is recommended. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
Match the following:
1. Project pulsed infrared from a transmitter to receiver 2. Operates at a very high frequency 3. Detect the sound of breaking glass 4. Sense a change in heat 5. Sound waves bounce off the object and back to the sensor’s receiver 6. Must be a direct path from transmitter to receiver 7. Continually emits an infrared light by infrared light-emitting diode 8. Glass break sensor 9. Combine more than one technology in one enclosure 10. Allow security guards to monitor areas where they do not have to be present A. Passive Infrared B. Active Infrared C. Ultrasonic D. Microwave/Radar E. Vibration F. Dual-Technology Motion G. Acoustic H. Photoelectric Beam I. Video Motion Detection
What is the purpose of a suction line accumulator in heat pump systems?
A) To protect the compressor by separating oil out of the returning refrigerant B) To accumulate debris and prevent it from entering the compressor C) To catch any liquid refrigerant that has not evaporated before it reaches the compressor D) To provide a safe way for technicians to charge liquid into the system