KERALA PSC TRADESMAN(REFRIGERATION & AIR CONDITIONING) 15-12-2016

TRADESMAN(REFRIGERATION & AIR CONDITIONING)

TECHNICAL EDUCATION DEPARTMENT

EXAM DATE:15-12-2016

ONLINE EXAM PRACTICE FREE NOW 

1.The ball bearings of electrical motor are lubricated by:

A.Grease*

B.Air

C.Oil

D.Water

Ans:A

2.Stabiliser used for 1.0 TR A/C is:

A.3 KVA*

B.3.5 KVA

C.4 KVA

D.4.5 KVA

Ans:A

3.Which one of the following gives DC supply?

A.Alternator

B.Transformer

C.Motor

D.Dynamo*

Ans:D

4.For checking the air movement,there is an instrument called:

A.Thermometer

B.Speedometer

C.Anemometer*

D.Mulimeter

Ans:C

5.The chemical formula of R134_ais:

A.C₂H₂F₄*

B.C₂CL₂F₄

C.CHCL₂F

D.CHCL₂

Ans:A

6.The thermostat for the window type air-conditioner is set at:

A.75⁰F*

B.80⁰F

C.85⁰F

D.65⁰F

Ans:A

7.Auto defrost operated by:

A.Timer switch*

B.Heating element

C.Thermostat

D.Evaporator fan

Ans:A

8.Brine solution density is checked by:

A.Tachometer

B.Anemometer

C.Barometer

D.Hydrometer*

Ans:D

9.An ideal refrigerants is one whose boiling point is:

A.High

B.Medium

C.Low*

D.Very High

Ans:C

10.The condenser in indirect system,condenses:

A.Oil

B.Refrigerant*

C.Brine

D.Water

Ans:B

11.High side float valve is fitted on the condensing unit just after the:

A.Receiver

B.Compressor

C.Condenser*

D.Evaporator

Ans:C

12.According to Ohm’s law I=

A.V.R

B.R/V

C.R.V

D.V/R*

Ans:D

13When air is heated relative humidity

A.Decreases*

B.Increases

C.Very high

D.None of the above

Ans:A

14.Which chemical is used for condenser descaling?

A.Phosphoric acid

B.Sulphuric acid

C.Citric acid

D.Hydrochloric acid*

Ans:D

15.Which refrigerant charged in car A.C?

A.R11

B.R22

C.R134*

D.R12

Ans:C

16.The pipes which are used for absorption refrigeration system:

A.Galvanised

B.Steel*

C.PVC

D.Brass

Ans:B

17.Convert from CFC12 to HFC 134 appliance,the compressor displacement will be:

A.Slightly larger*

B.Smaller

C.Equal

D.Double

Ans:A

18.Dry ice is:

A.Ammonia

B.H₂O

C.Carbon mon-oxide

D.Carbon dioxide*

Ans:D

19.Relay is protection device used in:

A.Evaporator

B.Compressor*

C.Condenser

D.Thermostat

Ans:B

20.Weak insulation can be checked by:

A.Ammeter

B.Meggar*

C.Tong tester

D.Line tester

Ans:B

21.In window type air-conditioners the following expansion device used:

A.Float valve

B.Thermostatic expansion valve

C.Capillary tube*

D.Hand valve

Ans:C

22.Freon 12 ideal pressure is:

A.2.0 kg/cm²

B.2.5 kg/cm²

C.3.5 kg/cm²

D.6.0 kg/cm²*

Ans:D

23.The storage capacity of a oxygen cylinder is:

A.6.0 m³

B.6.5 m³

C.7.01 m³

D.7 m³*

Ans:D

24.What is the range of flame temperature of oxygen-hydrogen gases?

A.1800 to 2000⁰C

B.2000 to 2200⁰C

C.2400 to 2700⁰C*

D.3100 to 3300⁰C

Ans:C

25.Which type of flux is used for soldering G.I.Sheets?

A.NH₄CI

B.Zncl₂

C.Resin

D.HCI*

Ans:D

26.The cooling capacity of 1.0 TR is:

A.6000 BTU/Hr

B.12000 BTU/Hr*

C.18000 BTU/Hr

D.24000 BTU/Hr

Ans:B

27.The atmospheric pressure at sea level is taken as:

A.1.03 kg/cm²

B.1.02 kg/cm²

C.1.033 kg/cm²*

D.1.023 kg/cm²

Ans:C

28.The freezing temperature of water is:

A.1⁰C

B.-1⁰C

C.-4⁰C

D.0⁰C*

Ans:D

29.The mechanical fault in refrigerator system is:
A.High voltage

B.Condenser coil dirty*

C.Over load protector burnt

D.Relay defective

Ans:B

30.Boiling point of R 600a is:

A.-15.8⁰C

B.-14.8⁰C

C.11.8⁰C*

D.10.8⁰C

Ans:C

31.The condenser coil type which used in deep freezer commonly:

A.Flooded type

B.Natural draft

C.Plate type

D.Force draft*

Ans:D

32.Internal energy of a substance is proportional to:

A.Velocity

B.Temperature*

C.Pressure

D.None of the above

Ans:B

33.The  closing of churner and top cover done air tight by:

A.’O’ring*

B.Seal

C.Gasket

D.Sticking tape

Ans:A

34.The thread angle of National fine thread is:

A.25⁰

B.35⁰

C.40⁰

D.45^0*

Ans:D

35.Select the ‘pitch’ of a medium hacksaw blade from the following:

A.1.8 mm

B.1.0 mm and 4 mm

C.1.4 mm and 1.0 mm*

D.0.8 mm

Ans:C

36.Refrigerator compressor motor winding burnt out:
A.High voltage*

B.Loose connection

C.Over load protector defective

D.Low voltage

Ans:A

37.Which of the following is not a desirable property of a good insulating material?

A.Light weight

B.Hight heat conductivity*

C.Odourless

D.Low cost

Ans:B

38.Compressor used in window A/c is:

A.Rotary compressor

B.Reciprocating compressor

C.Sealled compressor*

D.Open type compressor

Ans:C

39.How many operations are in service valve?

A.One

B.Two

C.Three*

D.Four

Ans:C

40.The most possible leakage spots in the refrigerator is:

A.Capillary tube

B.Brazing tube joints*

C.Condenser

D.Evaporator

Ans:B

41.One Kilowat is equal to:

A.1.34 H.P*

B.1.66 H.P

C.1 H.P

D.1.5 H.P

Ans:A

42.It is an instrument used to measure high temperature:

A.Psychometer

B.Pyrometer*

C.Thermometer

D.Micrometer

Ans:B

43.The operation of split A/c produces:

A.High noise

B.Medium noise

C.Low noise

D.No noise*

Ans:D

44.Ball bearing can be removed by using:

A.Ring spanner

B.Mallet

C.Puller*

D.Hammer

Ans:C

45.The metal wire which give good earth contact is:

A.Copper*

B.GI

C.Brass

D.Aluminium

Ans:A

46.Name the temperature at which moisture condenses on a surface:

A.Relative humidity

B.Grains of moisture

C.Dew point temperature*

D.Humidity

Ans:C

47.Name the correct tool which is used to cut wires

A.Wire cutter*

B.Tube cutter

C.Shear

D.Combination plier

Ans:A

48.Select the minimum number of diodes used in fulwave rectifier:

A.Four

B.One

C.Three

D.Two*

Ans:D

49.The unit of pressure in SI system is:

A.N/m

B.N/m¹

C.N/m²*

D.N/m³

Ans:C

50.The amount of heat required in calories to raise the temperature of one gram of substance through 1⁰C is:

A.Sensible heat

B.Specific heat*

C.Latent heat

D.B.t.u

Ans:B

51.Specify the thickness of a sheet metal having 18 SWG (Standard Wire Guage)

A.1.02

B.1.63

C.1.01

D.1.22*

Ans:D

52.The size of ½” copper tube is equal to:

A.12 mm*

B.13 mm

C.14 mm

D.15 mm

Ans:A

53.350 litres refrigerator---------compressor is used

A.1/4 H.P

B.1/5 H.P*

C.1/6 H.P

D.1/8 H.P

Ans:B

54.The temperature in degree centigrade for human comfort is:

A.15

B.17

C.19

D.21*

Ans:D

55.If the vacuum level inside the refrigerator is 30 mm of Hg the moisture boiling temperature will be:

A.25⁰C*

B.30⁰C

C.35⁰C

D.40⁰C

Ans:A

56.The size of the gasket is depends on:

A.Width

B.Thickness*

C.Length

D.Area

Ans:B

57.The material with highest ductility:

A.Cast iron

B.Tin

C.Copper

D.Gold*

Ans:D

58.To cool 20 litres of water from 32⁰C to 12.5⁰C in one hour.

Calculate the amount of heat removed:

A.370 Keal/Hr

B.380 Keal/Hr

C.390 Keal/Hr*

D.400 Keal/Hr

Ans:C

59.In large capacity air-conditioning applications the following expansion device is used:

A.Capillary tube

B.Thermostatic expansion valve*

C.Float valve

D.Automatic expansion valve

Ans:B

60.Relative humidity of air at the grill of an air-conditioner as compared to the room humidity is:

A.Less

B.More*

C.Same

D.None of the above

Ans:B

61.The Global Warming Potential(GWP)of R134 is:
A.1500

B.1400

C.1300*

D.1200

Ans:C

62.The solder wire used in electronic soldering melts at:

A.400⁰C

B.200⁰C*

C.600⁰C

D.800⁰C

Ans:B

63.Select the material used to check the tightness of door gasket of a refrigerator:

A.Gasket sheet

B.Rubber sheet

C.Paper sheet*

D.Plastic sheet

Ans:C

64.When a pressure switch cut-out,it will make the drive to:

A.Stop*

B.Start

C.Run on various speed

D.Run slowly

Ans:A

65.When wet bulb and dry bulb temperature are equal the humidity is:

A.100%*

B.90%

C.80%

D.60%

Ans:A

66.One tone of refrigeration is equal to:

A.21 KJ/min

B.420 KJ/min

C.210 KJ/min*

D.620 KJ/min

Ans:C

67.A water cooler is uses the refrigerant:

A.R 22

B.R 21

C.R 717

D.R 134a*

Ans:D

68.What is the angle of point of centre punch?

A.90⁰*

B.60⁰

C.45⁰

D.30⁰

Ans:A

69.The switch should control the line:

A.Earth

B.Phase*

C.Neutral

D.Common

Ans:B

70.A compressor coupled to a motor externally is called:

A.Sealed compressor

B.Open type compressor*

C.Semi-sealed compressor

D.None of the above

Ans:B

71.The purpose of a filter drier is to remove:

A.Oil

B.Gaskets

C.Moisture*

D.Sludge

Ans:C

72.The storage capacity of a dissolved acetylene cylinder is:

A.6.0 m³*

B.6.5 m³

C.7.0 m³

D.7.5 m³

Ans:A

73.The heart of refrigeration system is:

A.Liquid receiver

B.Condenser

C.Evaporator

D.Compressor*

Ans:D

74.Velocity is measured in the units of:

A.RPM

B.CFM

C.Kg Km²

D.F.P.M*

Ans:D

75.Colour code of ammonia refrigerant cylinder:

A.Light blue

B.Light green

C.Orange

D.Silver*

Ans:D

76.Identify the zeotropic refrigerant from the following:

A.R40

B.R407C*

C.R 22

D.R12

Ans:B

77.Double cut file is made of:

A.Cast steel

B.Cast iron

C.High carbon steel*

D.Spring steel

Ans:C

78.In air-refrigeration system,the coefficient of performance is:

A.High

B.Low*

C.Very high

D.Moderate

Ans:B

79.A low side float valve maintains the level of refrigerant in:

A.Flooded evaporator*

B.Evaporator

C.Condenser

D.Compressor

Ans:A

80.-40⁰F is:

A.-40⁰C*

B.+40⁰C

C.4.4⁰C

D.-10⁰C

Ans:A

81.Which famous writer coined the term ‘Banana Republic to denote politically countries?

A.Winston Churchill

B.Grover Cleveland

C.Henry*

D.Adam Smith

Ans:C

82.Which team won Azian Shah Hockey Tournament in 2013?

A.Malaysia

B.Netherland

C.Pakistan
D.Australia*

Ans:D

83.Who was an active member of secret society “Lotus and Dagger”to liberate Indian from the British?

A.A.O.Home

B.Aurobindo Gosh*

C.K.Kamaraj

D.Palindas

Ans:B

84.The founder of St.Joseph’s press at Mannanam:

A.Thomas Malpan

B.Thomas Kathanar

C.Mar Kuriakose Elias Chavara*

D.Kayamkulam Philipose

Ans:C

85.The system of competitive examination for civil service was accepted in principle in the Year:

A.1852

B.1863

C.1856

D.1853*

Ans:D

86.Who was known as India’s unofficial ambassador in England?

A.Dadabhai Naoroji*

B.Gopala Krishna Gokhale

C.Subhash Chandra Bose

D.Bipin Chandra Pal

Ans:A

87.Where is the central secretariat of ASEAN located?

A.Paris

B.Burma

C.Philippines

D.Jakaria*

Ans:D

88.Which day was fixed as Direct Action Day by the Muslim League?

A.October 16

B.August 16*

C.August 26

D.September 16

Ans:B

89.Name the person who used the term’cold war’ for the first time:

A.Franklin Roosevelt

B.Walter Lippmann

C.Bernard Baruch*

D.Albert Hoffman

Ans:C

90.Urdu daily started by Lala Lajpat Rai:

A.Vande Mataram*

B.Kesari

C.Sambad Koumudi

D.Common Wheel

Ans:A

91.Name the person associated with kuka movement:

A.Raja Toder Mal
B.Bhagat Jawahar Mal*

C.Bhagat Singh

D.Chandrasekhar Azad

Ans:B

92.Who were Jotedars?

A.Rich Peassants*

B.Money Lenders

C.Tax Collectors

D.Zamindars

Ans:A

93.Which act of the British was termed as the ‘Gagging Act’?

A.Regulating act

B.Rowlat act

C.Vernacular Press act*

D.Pitt’s India act

Ans:C

94.Which country is known as the cradle of renaissance movement?

A.Germany

B.Italy*

C.France

D.Switzerland

Ans:B

95.Founder of samatva samajam:

A.Sree Narayana Guru

B.Vaghbadananda

C.Chattambi Swamikal

D.Vaikunda Swamikal*

Ans:D

96.The painting ‘Relief of Lucknow’was painted by:

A.Thomas Jones Barker*

B.Ravivarma

C.Joseph Noel Paton

D.Miss Wheeler

Ans:A

97.The largest temple in the world ‘Ankorvat’built by:

A.Yasovarman

B.Rudravarman
C.Suryavarman*

D.Jayavarman

Ans:C

98.Who is known as the father of Conditional Drift Theory?
A.Berry Willis

B.Alfred Wegener*

C.Alfred Marshall

D.Harold Jeffrey

Ans:B

99.The ruins of Hampi were discovered by:

A.Colonel Cohn Mackenzie*

B.Alexander  Greem Law

C.J.F.Fleet

D.George Maxbelle

Ans:A

100.Father of local self government in India:

A.Lord Canning

B.Lord Ripon*

C.Lord Dufferin

D.Lord Delhousee

Ans:B