Refrigeration Mechanic (HER) – Health Services

PROVISIONAL ANSWER KEY
Question Paper Code: 14/2020/OL
Category Code: 223/2017
Exam: Refrigeration Mechanic (HER)
Date of Test 12-09-2020
Department Health Services
Alphacode A
Question1:-Day after tomorrow is Friday, then what is the previous day of today ?
A:-Friday
B:-Wednesday
C:-Tuesday
D:-Thursday
Correct Answer:- Option-C
Question2:-If TOP is coded as POT, then TABLE is coded as
A:-Elbat
B:-Batle
C:-Telab
D:-Betla
Correct Answer:- Option-A
Question3:-Find out the missing letter of the following series : B, E, H, _
A:-L
B:-J
C:-K
D:-O
Correct Answer:- Option-C
Question4:-How much is 40% of 3 hour and 30 minutes ?
A:-2 Hr. 10 mts.
B:-1 Hr. 24 mts.
C:-4 Hr. 30ts.
D:-2 Hr. 20 mts.
Correct Answer:- Option-B
Question5:-A teacher is to school, like a nurse is to
A:-Factory
B:-Laboratory
C:-Prison
D:-Hospital
Correct Answer:- Option-D
Question6:-If BAG is coded as 217, decode the number 6554.
A:-DEF
B:-FEED
C:-BEEF
D:-BED
Correct Answer:- Option-B
Question7:-In a month with 31 days, the first day of the month is Tuesday, then the last day of the month is
A:-Monday
B:-Friday
C:-Wednesday
D:-Thursday
Correct Answer:- Option-D
Question8:-Insert the missing number :
14 9 5
13 7 6
21 8 —
A:-12
B:-15
C:-13
D:-18
Correct Answer:- Option-C
Question9:-Arun walks 100 metre in 4 minutes. How many minutes will be take to complete 575 metre ?
A:-25 mts.
B:-20 mts.
C:-23 mts.
D:-30 mts.
Correct Answer:- Option-C
Question10:-Find the odd-man out.
A:-36
B:-49
C:-81
D:-70
Correct Answer:- Option-D
Question11:-The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and
pressure is known as
A:-Wet bulb depression
B:-Absolute humidity
C:-Degree of saturation
D:-Relative humidity
Correct Answer:- Option-D
Question12:-A standard ice point temperature corresponds to the temperature of
A:-Water at zero degree Celsius
B:-Solid and dry ice
C:-Ice at –4 degree Celsius
D:-Mixture of ice and water under equilibrium conditions
Correct Answer:- Option-D
Question13:-The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
A:-Bigger
B:-Smaller
C:-Smaller or bigger
D:-Unpredictable
Correct Answer:- Option-A
Question14:-At 100% relative humidity, the temperatures, dry bulb, wet bulb, dew point and saturation are
A:-Equal
B:-Different
C:-Three equal, one different
D:-None of the above
Correct Answer:- Option-A
Question15:-Humidity ratio is the mass of water vapour present in
A:-1𝑚3
of wet air
B:-1𝑚3
of dry air
C:-1kg of wet air
D:-1 kg of dry air
Correct Answer:- Option-D
Question16:-Critical pressure of a liquid is the pressure
A:-Above which liquid will remain liquid
B:-Above which a liquid becomes gas
C:-Above which a liquid becomes gas
D:-At which all the phases exist together
Correct Answer:- Option-A
Question17:-Ammonia is
A:-Non-toxic
B:-Non-inflammable
C:-Toxic and non-inflammable
D:-Highly toxic and inflammable
Correct Answer:- Option-D
Question18:-For room air distribution, the maximum variation in temperature is
A:-0 degree Celsius
B:-1 degree Celsius
C:-–1 degree Celsius
D:-5 degree Celsius
Correct Answer:- Option-B
Question19:-The device used to finish a drilled hole
A:-File
B:-Die
C:-Tap
D:-Reamer
Correct Answer:- Option-D
Question20:-Presence of moisture in a refrigerant affects the working of
A:-Compressor
B:-Condenser
C:-Expansion valve
D:-Evaporator
Correct Answer:- Option-C
Question21:-The boiling point of ammonia is
A:-–100 degree Celsius
B:-–50 degree Celsius
C:-–33.3 degree Celsius
D:-33 degree Celsius
Correct Answer:- Option-C
Question22:-Which of the following refrigerant has the highest critical point temperature ?
A:-Freon-11
B:-Freon-12
C:-Ammonia
D:-Freon-22
Correct Answer:- Option-A
Question23:-One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice in
A:-In 1 hour
B:-In 24 hour
C:-In 12 hour
D:-In 6 hour
Correct Answer:- Option-B
Question24:-In Electrolux refrigerator
A:-Ammonia is absorbed in hydrogen
B:-Ammonia is absorbed in water
C:-Ammonia evaporates in hydrogen
D:-Hydrogen is absorbed in ammonia
Correct Answer:- Option-C
Question25:-One tonne of refrigeration is equal to
A:-210 KJ/min
B:-3.5 kW
C:-3.5 kJ/s
D:-All the above
Correct Answer:- Option-D
Question26:-On psychrometric chart, dry bulb temperature lines are
A:-Horizontal
B:-Vertical
C:-Curved
D:-Inclined
Correct Answer:- Option-B
Question27:-The comfort conditions in air conditioning system are defined by
A:-22°C dry bulb temperature and 60% relative humidity
B:-25°C dry bulb temperature and 100% relative humidity
C:-20°C dry bulb temperature and 75% relative humidity
D:-25°C dry bulb temperature and 40% relative humidity
Correct Answer:- Option-A
Question28:-Condensing temperature in a refrigerator is the temperature
A:-Of cooling medium
B:-Of freezing zone
C:-Of evaporator
D:-At which a refrigerant becomes liquid
Correct Answer:- Option-D
Question29:-The function of brine agitator in ice plant is to
A:-Increase refrigeration effect
B:-Increase COP
C:-Obtain uniform temperature of brine
D:-All of the above
Correct Answer:- Option-C
Question30:-A sling psychrometer is used to measure
A:-Volume
B:-Humidity
C:-Pressure
D:-Velocity
Correct Answer:- Option-B
Question31:-A product of decomposition of oil resulting from impurities or moisture is
A:-Sludge
B:-Foam
C:-Purge
D:-None of these
Correct Answer:- Option-A
Question32:-Out of the following compressors which one has no moving parts ?
A:-Reciprocating
B:-Rotary
C:-Thermo
D:-Centrifugal
Correct Answer:- Option-C
Question33:-The heat rejection factor is given by
A:-1 + COP
B:-1 – COP
C:-1 + 1/COP
D:-1 – 1/COP
Correct Answer:- Option-C
Question34:-The refrigerant for a refrigerator should have
A:-High sensible heat
B:-High total heat
C:-High latent heat
D:-Low sensible heat
Correct Answer:- Option-C
Question35:-Freon group refrigerants are
A:-Inflammable
B:-Toxic
C:-Nontoxic and non-inflammable
D:-Toxic and non-inflammable
Correct Answer:- Option-C
Question36:-In a Carnot cycle, heat is transferred at
A:-Constant pressure
B:-Constant volume
C:-Constant temperature
D:-Constant enthalpy
Correct Answer:- Option-C
Question37:-A process in which substance is exposed to mechanical or chemical action of air is called
A:-Agitation
B:-Aeration
C:-Aspiration
D:-Atomization
Correct Answer:- Option-B
Question38:-The capacity of domestic refrigerator is of the range of
A:-0.1 to 0.3 TR
B:-1 to 3 TR
C:-3 to 5 TR
D:-5 to 7 TR
Correct Answer:- Option-A
Question39:-The tubes of shell and tube condenser in ammonia refrigerant is made up of
A:-Steel
B:-Copper
C:-Brass
D:-Glass
Correct Answer:- Option-A
Question40:-A bootstrap air cooling system has
A:-One heat exchanger
B:-Two heat exchanger
C:-Three heat exchanger
D:-No heat exchanger
Correct Answer:- Option-B
Question41:-A system of fixed mass and identity whose boundaries are determined by the space of matter occupied in it is called
A:-Closed system
B:-Open system
C:-Isolated system
D:-Control volume
Correct Answer:- Option-A
Question42:-Formation of frost on evaporator in refrigerator
A:-Results in loss of heat due to poor heat transfer
B:-Increases heat transfer rate
C:-Has no effect
D:-Decreases compressor power
Correct Answer:- Option-A
Question43:-Chemical formula of Freon-12
A:-𝐶𝐶𝑙2𝐹2
B:-𝐶𝐶𝑙3 𝐹2
C:-𝐶𝐶𝑙3𝐹
D:-𝐶𝐶𝑙𝐹2
Correct Answer:- Option-A
Question44:-Heating of air without changing its moisture content takes place on psychrometric chart along
A:-A vertical line upward
B:-A vertical line downward
C:-A horizontal line of the constant dew point
D:-Curved line
Correct Answer:- Option-C
Question45:-Drift loss in cooling tower is of the order of
A:-1 to 5%
B:-5 to 10%
C:-10 to 20%
D:-25 to 50%
Correct Answer:- Option-C
Question46:-Out of the following which one is an example for intensive property ?
A:-Temperature
B:-Pressure
C:-Density
D:-All the above
Correct Answer:- Option-D
Question47:-Which of the following property remains constant during throttling process ?
A:-Internal energy
B:-Pressure
C:-Entropy
D:-Enthalpy
Correct Answer:- Option-D
Question48:-According to Charles law for a perfect gas
A:-𝑇2/𝑇1 = 𝑃2/𝑃1, if V is kept constant
B:-𝑇2/𝑇1 =𝑉2/𝑉1, if P is kept constant
C:-𝑃2/𝑃1 =𝑉1/𝑉2 , if T is kept constant
D:-PV/T = constant
Correct Answer:- Option-B
Question49:-The bank of tubes at the back of domestic refrigerator is
A:-Condenser tubes
B:-Evaporator tubes
C:-Throttling tubes
D:-Capillary tubes
Correct Answer:- Option-A
Question50:-In cooling tower water is cooled by the process of
A:-Condensation
B:-Fusion
C:-Evaporation
D:-All of the above
Correct Answer:- Option-C
Question51:-The latent heat of water is
A:-540 K.Cal/Kg
B:-240 K.Cal/Kg
C:-120 K.Cal/kg
D:-60 K.Cal/kg
Correct Answer:- Option-A
Question52:-Thermal conductivity of air with rise in temperature
A:-Increases
B:-Decreases
C:-Remains constant
D:-May increase or decrease
Correct Answer:- Option-A
Question53:-The thermostatic expansion valve is also called
A:-Constant superheat valve
B:-Constant pressure valve
C:-Constant temperature valve
D:-Constant volume valve
Correct Answer:- Option-A
Question54:-A grill along with a damper is called
A:-Register
B:-Duct
C:-Diffuser
D:-Attenuator
Correct Answer:- Option-A
Question55:-The refrigeration plants are charged by introducing refrigerants from the cylinder at the
A:-Suction of compressor
B:-Receiver
C:-Evaporator
D:-Expansion valve
Correct Answer:- Option-B
Question56:-Domestic refrigerator working on a vapor compression cycle uses the following type of expansion device.
A:-Electrically operating throttling valve
B:-Manually operated valve
C:-Thermostatic valve
D:-Capillary tube
Correct Answer:- Option-D
Question57:-The measurement of temperature is given by which thermodynamic law ?
A:-Zeroth law
B:-First law
C:-Second law
D:-Third law
Correct Answer:- Option-A
Question58:-A drier is located in the
A:-Liquid line
B:-Vapour line
C:-Compressor
D:-Evaporator
Correct Answer:- Option-A
Question59:-Out of the following refrigerants, which one has lowest freezing point ?
A:-Freon-22
B:-Freon-12
C:-Ammonia
D:-Sulphur di oxide
Correct Answer:- Option-B
Question60:-The power per tone in KW of refrigeration is given by
A:-3.5/COP
B:-3.5 ×COP
C:-350/COP
D:-35/COP
Correct Answer:- Option-A
Question61:-The index which correlates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as
A:-Mean radiant temperature
B:-Dew point temperature
C:-Effective temperature
D:-None of these
Correct Answer:- Option-C
Question62:-The process of adding of moisture to air at constant dry bulb temperature is known as
A:-Humidification
B:-Dehumidification
C:-Heating
D:-Cooling
Correct Answer:- Option-A
Question63:-Undercooling in a refrigeration cycle
A:-Increases COP
B:-Decreases COP
C:-Don’t chance COP
D:-Unpredictable
Correct Answer:- Option-A
Question64:-Superheated vapor behaves
A:-Exactly as gas
B:-As steam
C:-As ordinary vapor
D:-Approximately as gas
Correct Answer:- Option-D
Question65:-The most widely used superconductor is
A:-Nichrome
B:-Tungsten
C:-Niobium
D:-Lead
Correct Answer:- Option-C
Question66:-The unit of thermal diffusivity is
A:-m/hK
B:-m/h
C:-𝑚2
/ℎ
D:-𝑚2
/ℎ𝑘
Correct Answer:- Option-C
Question67:-Dust and other impurities in air are removed by
A:-Air washer
B:-Centrifugal device
C:-Adhesive impregnated filter
D:-Any of the above
Correct Answer:- Option-D
Question68:-The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant
A:-Is same
B:-Is more
C:-Is less
D:-Is Unpredictable
Correct Answer:- Option-C
Question69:-An air washer is used in a refrigeration system for
A:-Cleaning
B:-Cooling
C:-Humidification
D:-All of the above
Correct Answer:- Option-D
Question70:-If suction pressure decrease, then COP
A:-Decreases
B:-Increases
C:-Has no change
D:-First increases and then decreases
Correct Answer:- Option-A
Question71:-Cooling towers are installed in places where
A:-Water is available in plenty
B:-Water is scarce
C:-For big plants
D:-For small plants
Correct Answer:- Option-B
Question72:-When two refrigerants are mixed in the proper proportions, the mixture forms a third refrigerant called
A:-Synthetic refrigerant
B:-Low pressure refrigerant
C:-Azeotropic refrigerant
D:-Auxiliary refrigerant
Correct Answer:- Option-C
Question73:-Air refrigerators works on
A:-Carnot cycle
B:-Strling cycle
C:-Reversed Joule cycle
D:-Atkinson cycle
Correct Answer:- Option-C
Question74:-Psychrometry is the science of measuring of _________ in air.
A:-Temperature
B:-Pressure
C:-Moisture
D:-Heat
Correct Answer:- Option-C
Question75:-Lithium bromide in vapor absorption refrigeration system is used as
A:-Refrigerant
B:-Cooling substance
C:-Lubricant
D:-Absorbent
Correct Answer:- Option-D
Question76:-The vertical distance, the air moves after it leaves the outlet and reaches at the end of blow is called
A:-Damper size
B:-Draft
C:-Drift
D:-Charge
Correct Answer:- Option-C
Question77:-A DC shunt motor has
A:-Constant speed
B:-Variable speed
C:-Variable velocity
D:-Pulsating speed
Correct Answer:- Option-A
Question78:-The ratio of supplied air to the air leaving the room is known as
A:-Entrainment ratio
B:-Discharge ratio
C:-Supply ratio
D:-Velocity ratio
Correct Answer:- Option-A
Question79:-Reciprocating refrigeration compressor uses following type of valve
A:-Rotary valve
B:-Ring plate valve
C:-Poppet valve
D:-Gate valve
Correct Answer:- Option-B
Question80:-Thermal insulator provide ________ path to heat.
A:-Smaller
B:-Longer
C:-Zero
D:-None of the above
Correct Answer:- Option-B
Question81:-A Baudelot evaporator is used to
A:-Chill ice
B:-Produce icecream
C:-Separate cream from milk
D:-Produce ice cube
Correct Answer:- Option-C
Question82:-The most suitable refrigerant for commercial ice plant is
A:-Brine
B:-Ammonia
C:-Freon
D:-Air
Correct Answer:- Option-B
Question83:-Moisture in refrigeration system is removed by
A:-Drier
B:-Dessicant
C:-Filter drier
D:-Any of the above
Correct Answer:- Option-D
Question84:-Air cooler reduces temperature and
A:-Reduces humidity
B:-Increases humidity
C:-Compress air
D:-Compress refrigerant
Correct Answer:- Option-B
Question85:-Which of the following is not desirable property of good insulating material ?
A:-Light weight
B:-High heat conductivity
C:-Odorless
D:-Conformability
Correct Answer:- Option-B
Question86:-The following type of expansion device is utilized in flooded evaporator
A:-Motor operated valve
B:-Self-actuated expansion valve
C:-Capillary tube
D:-Float valve
Correct Answer:- Option-D
Question87:-The solar radiation reaches earth by beam radiation and
A:-Diffused conduction
B:-Diffused radiation
C:-Diffused convection
D:-Beam convection
Correct Answer:- Option-B
Question88:-As relative humidity decreases, the dew point will be
A:-Lower than wet bulb temperature
B:-Higher than wet bulb temperature
C:-Equal to wet bulb temperature
D:-Having no relation
Correct Answer:- Option-A
Question89:-The unit of capacitance is expressed by
A:-Farad
B:-Watt
C:-Ampere
D:-Volts
Correct Answer:- Option-A
Question90:-An electrically operated switch used to disconnect the starting winding from the circuit, when the motor reaches 75% of its rated speed
A:-OLP
B:-Starting capacitor
C:-Relay
D:-Running capacitor
Correct Answer:- Option-C
Question91:-Which part of Indian Constitution deals with Fundamental Rights ?
A:-Part 12
B:-Part 5
C:-Part 4
D:-Part 3
Correct Answer:- Option-D
Question92:-Which article of Indian Constitution deals with Amendment of Constitution ?
A:-Article 356
B:-Article 36
C:-Article 368
D:-Article 370
Correct Answer:- Option-C
Question93:-How many schedules are there in Indian Constitution ?
A:-8 Schedules
B:-10 Schedules
C:-12 Schedules
D:-5 Schedules
Correct Answer:- Option-C
Question94:-Which Amendment added Right to Education to Indian Constitution ?
A:-86�ℎ
Amendment
B:-84�ℎ
Amendment
C:-73��
Amendment
D:-68�ℎ
Amendment
Correct Answer:- Option-A
Question95:-Who was the Chairman of Drafting Committee of Indian Constitution ?
A:-Dr. Rajendra Prasad
B:-Jawahar Lal Nehru
C:-Dr. B. R. Ambedkar
D:-K. M. Munshi
Correct Answer:- Option-C
Question96:-Who is the Ex-Officio Chairman of Rajya Sabha ?
A:-Prime Minister
B:-Vice President
C:-President
D:-Governor
Correct Answer:- Option-B
Question97:-Name the body which framed Indian Constitution.
A:-Parliament
B:-Constituent Assembly
C:-Rajya Sabha
D:-Lok Sabha
Correct Answer:- Option-B
Question98:-Which Article of Indian Constitution abolishes untouchability ?
A:-Article 17
B:-Article 18
C:-Article 32
D:-Article 15
Correct Answer:- Option-A
Question99:-What is the minimum age required to contest in Lok Sabha Election ?
A:-35 years
B:-30 years
C:-40 years
D:-25 years
Correct Answer:- Option-D
Question100:-How many members are elected to Kerala Legislative Assembly ?
A:-140
B:-141
C:-142
D:-9
Correct Answer:- Option-A