Laser Based Interferometers are used to measure air velocity and pressure. a. False b. True

For forced draft counter flow cooling tower O a. fan is kept at top of cooling tower and air and water flow in same directions. O b. fan is kept at bottom of cooling tower and air and water flow in opposite directions. c. fan is kept at top of cooling tower and air and water flow in opposite directions. O d. fan is kept at bottom of cooling tower and air and water flow in same directions.

Technician A says that a great amount of heat is transferred when a liquid boils or a vapor condenses. Technician B says that a change in pressure does not change the boiling point of a substance. Who is correct?

Coolant condition can be tested with all the following tools EXCEPT: Select one: a. Hydrometer b. Barometer c. Refractometer d. Electronic tester

Which of the following statements about safetyglasses is true?a. They should offer side protection.b. The lenses should be made of a shatterproofmaterial.c. Some service operations require that additionaleye protection be worn with safety glasses.d. All of the above statements are true.

1.During a refrigerant system performance test the following results are recorded: outside ambient temperature of 908F, high-side gauge reading of 145 psi, and low pressure gauge reading of 14 psi. What is indicated by these results?   A. Faulty refrigerant compressor B. Normal refrigerant system operation C. Low refrigerant levels D. A restriction on the high side of the refrigerant system 2. A customer complains of poor air-conditioning cooling performance. During a system performance test, the low-side gauge reading is 50 psig; the high-side gauge reading is 310 psig; and the ambient air temperature is 818F (27.228C). What is the least likely cause of the above results? A. Restricted airflow through condenser B. Refrigerant overcharge C. Refrigerant undercharge D. Overcharge of refrigerant oil   I NEED BOTH QUESTION TYPED ANSWER PLEASE DETAIL ANSWER

true or false: Tresca’s theory is more conservative than vonMises theory (T or F)?

Testing oil pressure sensors usually involves substituting the specified in place of the sensor and observing the reaction of the oil pressure gauge. Select one: a. Pressure b. Voltage c. Resistance d. None of the above