FDNY Z51 RMO Set Test Questions And Verified Correct Solutions | Updated

FDNY Z51 RMO Set Test Questions And Verified Correct Solutions | Updated The efficiency of the refrigerant cycle is affected by the operation of the condenser. Of the following, a more efficient centrifugal compressor operation results from : a. Raising the condenser liquid level to the maximum b. Lowering the chilled water set point c. Raising the condenser head pressure d. Lowering the condensing pressure d. Lowering the condensing pressure The heat removed from the refrigerant in a condenser is: a. Sensible and latent heat b. Latent heat only c. Radiant heat only d. Sensible heat only a. Sensible and latent heat The refrigerant unit that you have been assigned to is being taken out of service for a major repair. You have been assigned to withdraw refrigerant for storage in suitable containers. According to the New York City fire code, you must ensure that the containers: a. Do not weight more than 200 pounds when filled b. Are approved by the US Department of Transportation c. Are approved by the OSHA Association d. Do not exceed 55 Gallon in ca pacity b. Are approved by the US Department of Transportation Which of the following best describes how the cylinder unloader work? a. Keep in the suction valve opened while the compressor is in the return stroke b. Controls the clearance volume in the com pressor with a solenoid c. Controls the opening of the passage into the compressor with variable vanes d. Unloads the piston to create less pressure a. Keep in the suction valve opened while the compressor is in the return stroke In most semi Hermetic comp ressors, the suction vapor is used to: a. Removes oil from the motor housing b. Cools the motor c. Minimizes oil foaming d. Removes oil form from the shaft b. Cools the motor The amount of refrigerant that flows through the orifices of an a economizer is determined by the: a. Number of economizer stages b. Temperature of the high side refrigerant c. Number of compressor stages d. Difference between the high side and low side pr essure d. Difference between the high side and low side pressure The installation of an inline refrigerant cleaning system is advisable: a. For high pressure refrigerant systems b. To purge non -condensables c. For systems using toxic refrigerant d. To remo ve impurities from the system d. To remove impurities from the system The type of refrigerant system that is least likely to leak refrigerant into the building space that are being cooled: a. The direct vented closed system b. The direct closed system c. Any system using reciprocating compressor d. The indirect system d. The indirect system The suction pressure of a reciprocating compressor is 65 PSIG. The discharge pressure of this compressor is 120 PSIG. The atmospheric is 14.7 PSI. The compression ratio for the given condition is closet to: a. 2.07 b. 4.41 c. 1.69 d. 1.84 c. 1.69 A superheated vapor is a: a. Dry vapor at the saturation temperature b. Dry saturated vapor c. Dry vapor above the saturation temperature d. Vapor with minimal amount of included liquid c. Dry vapor above the saturation temperature A refrigerant engineer verifies that a condenser water pump is cavitating. Of the following, the most likely cause for this condition is: a. A faulty cooling tower water level controller b. Operating at sustaining high loads c. Too long a period between pump servicing d. Refrigerant leaks through the pumps packing a. A faulty cooling tower water level controller A centrifugal water pump is known as a lift pump when the: a. The pump lifts t he water in the pump upon startup b. The water supply to the pump suction inlet is below the pump level c. The discharge head exceed 150 feet d. The pump is started with the suction valve open b. The water supply to the pump suction inlet is below the pump level A TXV is used to maintain constant: a. Refrigerant flow b. Evaporator pressure c. Evaporator pressure drop d. Evaporator super heat d. Evaporator super heat The chilled water supply to the building is 55F. If the chiller is being used for human comfort, should you be concerned about this, and why? a. Yes, this temperate is too low for human comfort purpose b. Yes, this temperature is too high for human comfort purpose c. No, 55F is within are acceptable range d. No, temperate gauges often give false high readings b. Yes, this temperature is too high for human comfort purpose The packing gland of a centrifugal pump serves to: a. Keep the bearing cooled