Technician A says that a system should be recharged with refrigerant until the condenser temperature is equal to the ambient temperature plus 100°F. Technician B says that a system should be recharged with the type and amount of refrigerant found on the vehicle's under-hood sticker. Who is correct?
A. Technician A
B. Technician B
C. Both Technicians A and B
D. Neither Technician A nor B
Answer is option(B) technician (B)
In vehicles there will be a sticker stating the amount and type of refrigerator. That will be posted under the hood. It will be displaying the number of pounds required for a full charge. It will also specify the refrigerant type also. This label is put to comply with SAE J-639.
Technician A says a refrigerant identifier is only needed when the technician is unsure of the refrigerant used in an AC system. Technician B says that some refrigerant identifiers can measure the amount of moisture in the refrigerant system to aid in diagnosis. Who is correct? A. Neither Technicians A nor B B. Both Technicians A and B C. Technician A D. Technician B
7. Technician A says that valve springs should be kept with the valve at the time of disassembly and tested for squareness and proper spring force. Technician B says that the exhaust valve is about percent of the size of the intake valve. Who is correct ? A. Both Technicians A and B B. Technician B Neither Technicians nor B D. Technician A
Technician A says that if the cooling system has been exposed to the air for more than 24 hours, the drier should be replaced Technician B says that repairs should be made before retrigerant is evacuated from a system. Who is correct? A. Neither Technician A B B. Both Technicians A and B C. Technician B D. Technician A
Technician A says that a micron gauge is a better indicator of vacuum than a gauge calibrated in inches of Hg. Technician B says that the service valve cores are normally removed before evacuating the system. Who is correct? A. Neither Technician A nor B B. Technician B C. Both Technicians A and B D. Technician A
Technician A says that the airflow default setting in vehicles is defrost, because seeing out the windshield is most important. Technician B says that failure for air to flow through any but the defrost vents is likely caused by a vacuum problem. Who is correct? A. Neither Technician A nor B B. Technician B C. Technician A D. Both Technicians A and B
Two Technicians are discussing automatic transmission/transaxle oil pumps. Technician A says that vane-type pumps are positive displacement pumps. Technician B says that converter drives the pump. Which technician is correct? A. Neither Technician A nor Technician B b. Technician B only C. Technician A only D. Both Technician A and Technician B
Two technicians are discussing refrigerant lines. Technician A says that line connections must be tight but not so tight that air can't get through. Technician B says that all connection O-rings have to be replaced when retrofitting a system to R-134a , Who is correct ?
While testing variable resistors: Technician A says that while checking a rheostat with a voltmeter, the voltage should change smoothly with a change in the control. Technician B says that a potentionmeter can be checkedwith a scope. Who is correct? a. Tec A b. Tec B c. Both A and B. d. Neither A nor B
Technician A says that the leading shoe lining receives the greatest wear on a leading-trailing shoe brake. Technician B says that leading-trailing brakes are nonservo brakes. Who is correct? A only B only Both A and B Neither A nor B
11. During an air-conditioning performance test , you notice that the compressor outlet is nearly as hot as the upper radiator hose . Technician A says that this is normal. Technician B says that the system is overcharged . Who is correct ? A. Both Technicians A and B B. Technician B C. Neither Technician A nor B D. Technician A