latihan soal permesinan kapal pasca standard icepointtemperature corresponds to the temperatureof

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1.  A standard icepointtemperature corresponds to the temperatureof

 

A. water at 0°C B. ice at – 4°C

C. solidand dryice

 

D. I don’t know

 

 

 

 

2.   Vapour compression refrigeration is some whatlike

 

A. Carnot cycle

 

B. Rankinecycle

 

C. reversedCamotcycle

D. I don’t know

 

 

3.   Which ofthe following cycles uses air as the refrigerant

 

A. Ericsson

B. Stirling

C. Carnot

D. I don’t know

 

 

 

 

4.   Ammonia-absorption refrigeration cyclerequires

 

A. verylittle work input

 

B. maximumwork input

 

C. nearlysamework input as forvapourcompressioncycle

 

D.I don’t know

 

5.   An important characteristicof absorption systemof refrigeration is

 

A. noisyoperation

 

B. quiet operation

 

C. cooling below 0°C

 

D. I don’t know

 

 

 

 

 

6.   Therelativecoefficientof performanceis

 

A. actual COP/fheoreticalCOP

B. theoreticalCOP/actual COP

C. actual COPx theoretical COP

D. I don’t know

 

 

7.       Clapeyronequation is arelation between A. temperature, pressure and enthalpy B. specificvolume andenthalpy

C. temperature, pressure, specific volurand’enthalpy.

 

D. I don’t know

 

8.   Clapeyronequation is applicable for registration at

 

A. saturation pointof vapour

B. saturation pointof liquid

 C. triple point

D. I don’t know

 

 

9.   In vapour compression cycle, the conditiiof refrigerant is saturated liquid

 

A. afterpassing through the condenser

 

B. beforepassing through thecondensei

 

C. afterpassing through the expansion throttle valve

 

D. I don’t know

 

10.   In vapour compression cycle, the condition of refrigerant is verywet vapour

 

A. afterpassing through the condenser

 

B. beforepassing through the condenser

 

C. afterpassing through the expansion or throttle valve

 

D. I don’t know

 

 

11.     In vapour compression cycle, the condition of refrigerant is high pressuresaturated liquid

A. afterpassing through the condenser

 

B. beforepassing through the condenser

 

C. beforeentering theexpansion valve

D.I don’t know

 

12.   In vapour compression cyclethe condition of refrigerant is superheated vapour

 

A. afterpassing through the condenser

 

B. beforepassing through the condenser

 

C. afterpassing through the expansion or throttle valve

 

D. I don’t know

 

13.   In vapour compression cyclethe condition offrefrigerant is drysaturated vapour

 

A. afterpassing through the condenser

 

B. beforepassing through the condenser

 

C. afterpassing through the expansion or throttle valve

 

D. I don’t know

 

 

14.   Theboiling point of ammonia is

 

A. -100°C B. -50°C

C. -33.3°C

D. I don’t know

15.     Oneton of refrigeration is equal to the refrigeration effect corresponding to melting of1000 kg ofice

A. in 1 hour

 

B. in 1 minute C. in 24 hours D. I don’t know

 

16.   Oneton refrigeratiqncorresponds to

 

A. 50 kcal/min

B. 50 kcal/kr

C. 80 kcal/min

D. I don’t know

17.   In S.J. unit, oneton of refrigeration is equal to

 

A. 210 kJ/min

B. 21 kJ/min

C. 420 kJ/min

D. I don’t know

 

18.   Thevapourcompressionrefrigeratoremploys thefollowing cycie

 

A. Rankine

 

B. Carnot

 

C. Reversed Rankine

 

D. I don’t know

 

19.     Allowable pressureon high-pressureside or ammonia absorption system isof the order of

A. atmosphericpressure

 

B. slightlyabove atmospheric pressure

 

C. 2-4 bars

 

D. I don’t know

 

20.   Themoisturein a refrigerant is removed by

 

A. evaporator

 

B. safetyrelief valve

 

C. dehumidifier

 

D. I don’t know

 

 

 

 

 

21.     The condensing pressuredueto thepresenceof non-condensablegases,as compared to that actuallyrequired for condensing temperatures withoutnon- condensable gases,

A. willbehigher

 

B. willbelower

 

C. willremain unaffected

 

D. I don’t know

22.   Critical pressureofaliquid is the pressure

 

A. abovewhich liquid will remain liquid

 

B. abovewhich liquid becomes gas

 

C. above which liquid becomes solid

 

D. I don’t know

 

23.   Critical temperatureis’ thetemperatureabovewhich

 

A. agas willnever liquefy

 

B. agas willimmediatelyliquefy

 

C. waterwillevaporate

 

D. I don’t know

 

24.   Therefrigerant forarefrigerator should have

 

A. high sensibleheat

 

B. hightotal heat C. highlatent heat D. I don’t know

25.   Rating ofadomesticrefrigerator is of theorder of

 

A. 0.1 ton B. 5 tons

C. 10 tons

D. I don’t know

26.   TheCOP of adomesticrefrigerator

 

A. isless than 1

 

B. ismorethan 1

C. is equal to 1

 

D. I don’t know

27.   Thedomesticrefrigerator uses following typeof compressor

 

A. centrifugal

 

B. axial

 

C. piston type reciprocating

 

D. I don’t know

 

28.   Presenceof moisturein a refrigerant affects theworking of

 

A. compressor

B. condenser

C. heat transfer.

D. I don’t know

29.   Refrigeration in aeroplanes usuallyemploys thefollowing refrigerant

 

A. Co2

 

B. Freon-11

 

C. Freon-22

 

D. I don’t know

 

30.     Domesticrefrigerator working on vapour compression cycleuses the following typeofexpansion device

A. electricallyoperated throttling valve

 

B. manuallyoperated valve

 

C. capillary tube

 

D. I don’t know

 

31.   Air refrigeration operates on

 

A. Carnot cycle

 

B. Reversed Carnot cycle

 

C. Rankinecycle D. I don’t know

32.   Air refrigeration cycle isused in

 

A. domesticrefrigerators

 

B. commercialrefrigerators

 

C. airconditioning

 

D. I don’t know

33.   Inavapourcompressioncycle, therefrigerant immediatelyafterexpansion valve is

 

A. liquid

 

B. sub-cooled liquid C. wetvapour

D.I don’t know

34.   Thevapourpressureof refrigerant should be

 

A. lower than atmosphericpressure B. higherthan atmosphericpressure C. equalto atmosphericpressure

D. I don’t know

 

35.     For better COP of refrigerator, thepressurerangecorresponding to temperaturein evaporator and condenser must be

A. smallB. high

C.  under some conditions small and under some conditions high.

D. I don’t know

 

36.   Thebank oftubesat theback of domesticrefrigerator are

 

A. condenser tubes

 

B. evaporator tubes

 

C. refrigerant cooling tubes

 

D. I don’t know

 

37.   Thehighertemperaturein vapour compression cycle occurs at

 

A. receiver

 

B. expansion valve

 

C. compressor discharge.

 

D. I don’t know

 

38.   Highest temperature encountered in refrigeration cycle should be

 

A. near critical temperatureof refrigerant

 

B. above critical temperature

 

C. atcritica. temperature

 

D. I don’t know

39.     Inrefrigerator, liquid receiveris required betweencondenserand flowcontrolling device, if quantityof refrigerant forsystem is

A. less than 2 kg

 

B. morethan or equal to 3.65 kg

 

C. morethan 10 kg

 

D. I don’t know

 

40.   Absorption system normallyuses thefollowing refrigerant

 

A. Freon-11

 

B. Freon-22

 

C. C02

 

D. I don’t know

 

41.   Oneof thepurposes of sub-cooling the liquid refrigerant is to

 

A. reducecompressor overheating

 

B. reducecompressor dischargetemperature

 

C. ensure that only liquid and not the vapour enters the expansion (throttling)  valve

D. I don’t know

 

 

 

 

42.   Thevalue ofCOP in vapourcompression cycleis usually

 

A. always less than unity B. always morethan unity C. equalto unity

D. I don’t know

 

43.   Inarefrigeration system, heat absorbed in comparison to heat rejected is

 

A. moreB. lessC. same

D. I don’t know

 

44.   Condensing temperaturein a refrigerator is thetemperature

 

A. ofcooling medium

 

B. offreezing zone

 

C. ofevaporator

 

D. I don’t know

 

 

45.   Formation offrost on evaporator in refrigerator

 

A. results in loss of heat dueto poor heat transfer

 

B. increases heat transferrate

 

C. can be avoided by proper design

 

D.  I don’t know

 

46.     Inrefrigerators, thetemperaturedifferencebetween the evaporating refrigerant and the mediumbeing cooledshould be

A. high, of theorder of 25°

 

B. as low as possible(3 to 11°C) C. any value

D. I don’t know

 

47.     Inafloodedevaporator refrigerator, anaccumulator at suction of compressor is used tocollectliquid refrigerant and prevent it from going to compressor

A. detectliquid in vapour

B. superheatthevapour

C. increase refrigeration effect

D. I don’t know

 

48.   Accumulators should have adequate volume to storerefrigerant charge at least

 

A. 10% B. 25% C. 75%

D. I don’t know

49.   At lower temperaturesand pressures, the latent heat of vaporisation ofarefrigerant

 

A. decreases

 

B. increases

 

C. remains same

 

D. I don’t know

50.     A refrigeration cycle operates betweencondensertemperatureof +27°C and evaporator temperatureof-23°C. TheCannot coefficient ofperformanceof cycle willbe

A. 0.2

 

B. 1.2

 

C. 5

 

D. I don’t know

 

51.   Which ofthe following is not a desirable propertyof arefrigerant

 

A. hightriiscibilitywith oil

 

B. low boiling point

 

C. goodelectrical conductor

 

D. I don’t know

 

52.   In vapour compression refrigeration system,refrigerant occurs as liquid between

 

A. condenserand expansion valve

 

B. compressorandevaporator

 

C. expansion valve andevaporator

 

D. I don’t know

 

 

53.     Pick up the correct statement about giving up of heat from one mediumto other in ammonia absorption system

A. strong solution to weak solution

 

B. weak solution to strong solution

 

C.ammonia vapour to strong solution.

D. I don’t know

54.     Efficiencyof aCornotengine is given as 80%.Ifthe-cycle direction bereversed, what willbethe value ofCOP of reversed Carnotcycle

A. 1.25

 

B. 0.8

 

C. 0.5

 

D. I don’t know

 

 

55.   Highest pressureencountered in a refrigeration system should be

 

A. critical pressureof refrigerant B. much below critical pressure

C. muchabovecritical pressure

D. I don’t know

 

 

 

 

 

 


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