100% Zufriedenheitsgarantie Sofort verfügbar nach Zahlung Sowohl online als auch als PDF Du bist an nichts gebunden
logo-home
FDNY Z51 WRITTEN EXAM ACTUAL EXAM COMPLETE 200+ QUESTIONS WITH DETAILED VERIFIED ANSWERS / ALREADY GRADED A+ $17.99
In den Einkaufswagen

Prüfung

FDNY Z51 WRITTEN EXAM ACTUAL EXAM COMPLETE 200+ QUESTIONS WITH DETAILED VERIFIED ANSWERS / ALREADY GRADED A+

 0 mal verkauft
  • Kurs
  • FDNY Z51 WRITTEN
  • Hochschule
  • FDNY Z51 WRITTEN

FDNY Z51 WRITTEN EXAM ACTUAL EXAM COMPLETE 200+ QUESTIONS WITH DETAILED VERIFIED ANSWERS / ALREADY GRADED A+

vorschau 4 aus 40   Seiten

  • 19. august 2024
  • 40
  • 2024/2025
  • Prüfung
  • Fragen & Antworten
  • FDNY Z51 WRITTEN
  • FDNY Z51 WRITTEN
avatar-seller
Verifiedtestbanks
FDNY Z51 WRITTEN EXAM ACTUAL EXAM
COMPLETE 200+ QUESTIONS WITH DETAILED
VERIFIED ANSWERS / ALREADY GRADED A+


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 - ANSWERD. 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 - ANSWERA. 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 weigh 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 Gallons in capacity - ANSWERB. 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 compressor with a solenoid
C. Controls the opening of the passage into the compressor with variable vanes
D. Unloads the piston to create less pressure - ANSWERA. Keep in the suction valve
opened while the compressor is in the return stroke

In the most semi Hermetic compressors, the suction vapor is used to:

A. Removes oil from the motor housing
B. Cools the motor

,C. Minimizes oil foaming
D. Removes oil foam from the shaft - ANSWERB. Cools the motor

The amount of refrigerant that flows through the orifices of 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 high side and low side pressure - ANSWERD. Difference
between 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 remove impurities from the system - ANSWERD. 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 - ANSWERD. 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 - ANSWERC. 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 - ANSWERC. 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 - ANSWERA. A faulty cooling tower
water level controller

A centrifugal water pump is known as a lift pump when the:

A. The pump lifts the water into 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 - ANSWERB. 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 superheat - ANSWERD. Evaporator superheat

The chilled water supply to the building is 55° F. IF the chiller is being used for humans
comfort, should you be concerned about this, and why?

A. Yes, this temperature is too low for human comfort purpose
B. Yes, this temperature is too high for humans comfort purpose
C. No, 55° F is within an acceptable range
D. No, temperature gauges often give false high readings - ANSWERB. Yes, this
temperature is too high for humans comfort purpose

The packing gland of a centrifugal pump serves to:

A. Keep the bearing cooled
B. Keeps air out of the pumps when the impeller housing is under negative pressure
C. The drip part of the packing gland gives evidence that there is water in the pump
D. All of the answers are correct - ANSWERC. The drip part of the packing gland gives
evidence that there is water in the pump

Capacity control of a reciprocating hermetic compressor is typically achieved through:

A. Regulating the opening of the discharge valve
B. Variation of the condenser water temperature
C. Regulating the opening of the TXV

, D. Operation of the hot gas bypass valve - ANSWERD. Operation of the hot gas bypass
valve

The most important reason to sub-cool the refrigerant in the condenser is to ensure that:

A. A pure liquid refrigerant will enter the metering device
B. Liquid slugs will not enter the compressor
C. The condenser is working efficiently
D. The cooling tower has sufficient water - ANSWERA. A pure liquid refrigerant will
enter the metering device

A refrigeration engineer is logging readings from a reciprocating system, compressor
discharge temperatures have dropped significantly, and the suction line pressure is
high, which of the following that may be causing this set of condition.

A. Compressor cycle
B. An expansion valve that is open to wide
C. Malfunction of a unloader
D. An expansion valve that is closed to much - ANSWERB. An expansion valve that is
open to wide

A low side float valve is used to maintain:

A. A constant refrigerant flow
B. The water level in the cooling towers
C. The level of refrigerant in the condenser
D. The level of the refrigerant in the evaporator - ANSWERD. The level of the refrigerant
in the evaporator

Regarding safety, which ASHRAE refrigerant safety classification indicates no
flammability and lower toxicity?

A. A3
B. A1
C. B1
D. B2 - ANSWERB. A1

When an expansion valve is operating properly, at the end of the evaporator will
contain:

A. Saturated liquid refrigerant
B. Only liquid refrigerant
C. Only vapor
D. Only superheated vapor - ANSWERD. Only superheated vapor

What information is not contained in a Material Safety Data Sheet-MSDS?

Alle Vorteile der Zusammenfassungen von Stuvia auf einen Blick:

Garantiert gute Qualität durch Reviews

Garantiert gute Qualität durch Reviews

Stuvia Verkäufer haben mehr als 700.000 Zusammenfassungen beurteilt. Deshalb weißt du dass du das beste Dokument kaufst.

Schnell und einfach kaufen

Schnell und einfach kaufen

Man bezahlt schnell und einfach mit iDeal, Kreditkarte oder Stuvia-Kredit für die Zusammenfassungen. Man braucht keine Mitgliedschaft.

Konzentration auf den Kern der Sache

Konzentration auf den Kern der Sache

Deine Mitstudenten schreiben die Zusammenfassungen. Deshalb enthalten die Zusammenfassungen immer aktuelle, zuverlässige und up-to-date Informationen. Damit kommst du schnell zum Kern der Sache.

Häufig gestellte Fragen

Was bekomme ich, wenn ich dieses Dokument kaufe?

Du erhältst eine PDF-Datei, die sofort nach dem Kauf verfügbar ist. Das gekaufte Dokument ist jederzeit, überall und unbegrenzt über dein Profil zugänglich.

Zufriedenheitsgarantie: Wie funktioniert das?

Unsere Zufriedenheitsgarantie sorgt dafür, dass du immer eine Lernunterlage findest, die zu dir passt. Du füllst ein Formular aus und unser Kundendienstteam kümmert sich um den Rest.

Wem kaufe ich diese Zusammenfassung ab?

Stuvia ist ein Marktplatz, du kaufst dieses Dokument also nicht von uns, sondern vom Verkäufer Verifiedtestbanks. Stuvia erleichtert die Zahlung an den Verkäufer.

Werde ich an ein Abonnement gebunden sein?

Nein, du kaufst diese Zusammenfassung nur für $17.99. Du bist nach deinem Kauf an nichts gebunden.

Kann man Stuvia trauen?

4.6 Sterne auf Google & Trustpilot (+1000 reviews)

45.681 Zusammenfassungen wurden in den letzten 30 Tagen verkauft

Gegründet 2010, seit 15 Jahren die erste Adresse für Zusammenfassungen

Starte mit dem Verkauf
$17.99
  • (0)
In den Einkaufswagen
Hinzugefügt