Post: Junior Instructor - Mechanic Refrigeration and Air Conditioning
Department: Industrial Training
Category Code: 02/17
Qualification: S.S.L.C + National Trade Certificate in the appropriate trade + 3 years experience, National Apprenticeship Certificate + 3 years experience; Diploma in the appropriate branch of Engineering
Question Paper Code: 67/18
Date of Test: 29-06-2018
If you find mistakes, comment below
- In a refrigeration cycle, pressure is maximum __________.
- After Expansion Valve
- After Condenser
- After Evaporator
- After Compressor
- The Dalton’s law deals with the __________.
- Sum partial volumes of gases
- Sum partial temperature of gases
- Sum partial pressure of gases
- None of these
- An automatic expansion valve is based on the principle of __________.
- Maintaining a constant degree of superheat
- Maintaining a constant pressure in evaporator
- Maintaining a constant temperature in the evaporator
- Both "Maintaining a constant degree of superheat" and "Maintaining a constant pressure in evaporator"
- Window AC for cooling mode can be easily converted to heating mode by installing a:
- TXV
- RCV
- AXV
- Solenoid valve
- Approach of a cooling tower is defined as the:
- Difference of DBT of surrounding air and temperature of water leaving the CT
- Difference of temperature of water leaving the CT and temperature of entering water
- Difference of temperature of water leaving the CT and WBT of surrounding air
- None of these
- Temporary hardness of water can be removed by:
- filtering
- chemical treatment
- boiling
- cooling
- The cleaning efficiency of a fine filter is:
- 99.9%
- 100%
- 80%
- 70%
- Which type of fan is used in electrical motors for internal cooling?
- Backward inclined fan
- Backward curved fan
- Forward curved fan
- Radial blade fan
- Which senses the suction temperature in thermal electric expansion valve?
- Transformer
- Thermal bulb
- Thermostat
- Thermistor
- Which run capacitor is used with 1.5 TR AC?
- 36 mfd, 220/250 V
- 80 mfd 220/250 V
- 36 mfd, 440/370 V
- 80 mfd 440/370 V
- The difference between the synchronous speed and the actual rotor speed is called:
- Motor speed
- Slip speed
- Actual speed
- Field speed
- The difference between the dry bulb temperature and wet bulb temperature is called:
- Dewpoint depression
- Wet bulb depression
- Dry bulb depression
- Humidity
- A low side float valve maintains the level of refrigerant in:
- Condenser
- Evaporator
- Baudelot cooler
- Flooded evaporator
- Boiling point of R 600a is:
- −33°C
- −12°C
- −77°C
- −40°C
- RF remote control with a range of roughly:
- 100 feet
- 40 feet
- 20 feet
- 10 feet
- Bush bearings are usually made of:
- Nickel
- Bronze
- Steel
- Platinum
- The sediments which form as a coating on cooling coil will reduce the __________.
- Temperature
- Heat transfer efficiency
- Suction pressure
- Heat load on evaporator
- The extinguisher used for electric fire is:
- Carbon tetrachloride extinguisher
- Carbon dioxide extinguisher
- Soda foam extinguisher
- Methyl bromide extinguisher
Question Error
- Cutting of sheet metal by two parallel cutting edge moving in opposite direction is termed as:
- Drawing
- Swaging
- Shearing
- Piercing
- Water is used as a refrigerant:
- Vapour absorption cycle
- Vapour compression cycle
- Steam jet refrigeration
- Air cycle
Question Error
- The upcoming alternative refrigerant to be used in car air conditioning system is __________.
- R 134a
- R 1234ze
- R 1234yf
- R 764
- Comfort cooling ducts are commonly fabricated out of:
- GI
- Aluminium
- FRP
- All of these
Question Error
- In saturated air:
- DBT = WBT
- WBT = DPT
- DBT = DPT
- All of these
- VRF stands for:
- Varying Recirculated Flow
- Variable Refrigerant Flow
- Varying Refrigerant Functions
- None of these
- The gap between the false ceiling and the main ceiling is referred as:
- Supply air duct
- Plenum
- Return air duct
- Diffuser
- During installation of split AC unit, what is the maximum vertical distance between indoor and outdoor units?
- 20 feet
- 30 feet
- 15 feet
- 40 feet
- Water pressure cut out switch is installed in:
- Cooling tower line
- Condenser water line
- Chilled water line
- Both "Condenser water line" and "Chilled water line"
- For leak testing, maximum test pressure for split AC system is:
- 70 PSIG
- 150 PSIG
- 100 PSIG
- 200 PSIG
- Cylindrical and needle roller bearings are commonly found in:
- Fans
- Rollerblades
- Gearboxes
- DC machines
- Following are the methods of food preservation:
- Dehydration
- Hydration
- Canning
- Both "Dehydration" and "Canning"
- A motor has 4 poles, its RPM is:
- 1500
- 3000
- 750
- 500
- Cooling performance test can only effectively done at ambient temperature above:
- 60°F
- 65°F
- 70°F
- 75°F
- If we use solar panels to run a car AC then the mileage of car will:
- Increase
- Decrease
- Remain same as earlier
- None of these
- The main working substance in air conditioning is __________.
- Dry air
- Moist air
- Dry ice
- Water vapour
- The temperature at which moisture condenses on a surface is called __________.
- Grains of moisture
- Wet bulb temperature
- Dry bulb temperature
- Dewpoint temperature
- Scaling:
- Means attaching a scale to system pipes for the length measurement.
- Is an instrument for measuring the length.
- Deposition of a layer of chemicals inside a water carrying pipe in a heat exchanger.
- None of these
- What is DDC in HVAC system?
- Direct Decimal Classification
- Direct Drive Control
- Direct Current
- Direct Digital Control
- Which valve allows fluid flow in only one direction?
- Ball valve
- Butterfly valve
- Check valve
- Shut-off valve
- Cylinder colour code for R 22 is:
- Light green
- Orange
- Light grey
- Light brown
- In a scroll compressor:
- Both discharge and suction ports are located in the outer periphery
- Both discharge and suction ports are located near the centre
- The discharge port is in the centre and suction port is on the outer periphery
- The suction port is in the centre and the discharge port is on the outer periphery
- Piercing valves are used to tap a line for:
- Recovery
- Testing
- Charging
- All of these
- Window and split air conditioning units are used __________ compressor motors.
- CSR
- RSIR
- CSIR
- Shaded pole
- Airflow quantities are measured in:
- FPM
- PSI
- BTU
- CFM
- Screwdrivers are classified according to:
- Length
- Size of working tip
- Shape of working tip
- All of these
- Compressor crankshaft seal prevents __________ from escaping out.
- Air
- Oil and Refrigerant
- Refrigerant
- Oil
- In a refrigeration cycle, the heat is rejected by refrigerant at:
- Compressor
- Evaporator
- Expansion valve
- Condenser
- For brazing most commonly used flux is:
- Borax
- Resin
- NHU4
- Carbonate chloride
- Single phase motor is __________.
- Shaft starting
- Self-starting
- Not self-starting
- None of these
- Liquid receiver in a vapour compression system is used in __________.
- Suction line
- Discharge line
- Liquid line
- Expansion line
- HEPA stands for:
- High Energy Particulate Air
- High-Efficiency Particulate Air
- High Effective Pressurized Air
- High Entry Particulate Air
- ADP represents:
- Coil temperature
- Coil pressure
- Coil point
- None of these
- GWP of R 134a refrigerant:
- 1700
- 1300
- 800
- 650
- Atmospheric pressure at sea level is:
- 1.01325 bar
- 14.7 PSI
- 760000 Microns
- All of these
- Following is an HC refrigerant:
- R 600a
- R 12
- R 22
- R 134a
- Capillary tube is used for __________.
- Low capacity system
- High capacity system
- Medium capacity system
- None of these
- What is the reason for poor condensation in Split AC?
- Condenser fan motor failure
- Sufficient airflow
- Condenser tubes are nice
- Condenser fin damage
Question Error
- Which instrument is used for measuring humidity?
- Hydrometer
- Thermometer
- Hygrometer
- Anemometer
- ODP Value of HFC 134a:
- 1
- 3
- 0
- 2
- De-superheating takes place in __________.
- Compressor
- Discharge line
- Condenser
- Both "Discharge line" and "Condenser"
- The ratio of the sensible heat to the total heat is known as:
- Sensible heat factor
- ADP
- Enthalpy
- Relative humidity
- The compressor motor in a hermetically sealed compressor is cooled by:
- Water
- Air
- Refrigerant
- Nitrogen
- Float valves are used in:
- Refrigerators
- Large refrigeration systems
- Package units
- Split AC
- Velocity pressure is:
- Difference between Static pressure and Air pressure
- Difference between Total pressure and Static pressure
- Difference between Air velocity and Air pressure
- None of these
- The unit of Resistance is __________.
- Ohm
- Farad
- Volt
- Ampere
- The heart of the refrigeration system is __________.
- Condenser
- Evaporator
- Liquid receiver
- Compressor
- Which line in Psychrometric chart as obliquely inclined straight lines and uniformly spaced?
- Relative humidity lines
- Specific humidity lines
- Enthalpy
- Specific volume
- In star delta starter the main contactor is named as:
- KM 1
- KM 2
- KM 3
- K1T
- What is the purpose of adding dye in compressor lubricating oil to the Car AC system?
- Identify the gas leak
- Lubricate the engine
- Adding performance
- Improve efficiency
- The relationship between rotor speed ‘N’, frequency ‘f’ and no. of poles ‘P’ given by the relation:
- N=120f/P
- PN=120f
- f=120N/P
- N=120P/f
- The coil has to be rinsed after de-scaling till the pH level comes to:
- 5 to 5.5
- 6 to 6.5
- 7 to 7.5
- 8 to 8.5
- The voltmeter can be used in __________.
- Series connection
- Parallel connection
- Combination of both series and parallel
- None of these
- During sensible heating of moist air, specific humidity:
- Increases
- Decreases
- Remains constant
- None of these
- The fresh air or ventilation air is a must in any comfort air conditioning system. Its purposes are __________.
- to provide oxygen
- to remove carbon dioxide
- to remove odours
- All of these
- Refrigerant propane has the designation __________.
- R 11
- R 134a
- R 290
- R 12
- The expansion device used in central AC plant is:
- AXV
- TXV
- Capillary tube
- Solenoid valve
- The chemical name of refrigerant R 134a is __________.
- Propane
- Dichloro difluoro methane
- Tetrafluoroethane
- Monochlorodifluoroethane
- Bourdon tube is a __________.
- Pressure measuring device
- Volume measuring device
- Density measuring device
- Temperature measuring device
- Three TR is equivalent to __________ of cooling effect.
- 5 kJ/s
- 10.5 kW
- 10 kJ/s
- 7 kW
- Dry Bulb Temperature (DBT) is the actual temperature of __________.
- Dry air
- Dry ice
- Water vapour
- Moist air
- Tools used for making external threads is:
- Taps
- Die
- Thread gauge
- Drill
- Which one of the following is not a basic features of the Indian Constitution?
- Parliamentary form of Government
- Federal form of Government
- Presidential form of Government
- Independence of Judiciary
- The number of Fundamental Rights Constitution originally consists of:
- 6
- 8
- 7
- 9
- The first, Right to Information application submitted by Shahid Raza Burney to a police in:
- Pune
- Thane
- Muzaffarnagar
- Patna
- In which year National Rural Employment Guarantee Yojana (NREGY), scheme was renamed as MNREGA?
- February, 2006
- April, 2006
- August, 2009
- December 2009
Question Error
- The CMS press, Kottayam, was established in 1821 by:
- Dr. Herman Gundert
- Rev. Benjamin Bailey
- Kuriakkose Elias Chavara Achan
- Anjelo Francis
- ‘Make Namboodhiri a human being’ was the slogan of:
- Samathwa Samajam
- Jathinasini Sabha
- Kalliyanadayani Sabha
- Yogakshema Sabha
- The movement that led to the formation of the first Public Service Commission in the state of Travancore was:
- Guruvayoor Satyagraha
- Civil Disobedience Movement
- Nivarthana Agitation
- Vaikom Satyagraha
- Which Patriot was the brain behind Malayali Memorial Petition submitted to Maharaja of Travancore?
- G.P. Pillai
- K. Kelappan
- Dr. Palpu
- Chempaka Raman Pillai
- Which is the paper edited by C. Krishnan to campaign vigorously against untouchability?
- Kerala Kaumudi
- Mitavadi
- Desabhimani
- Sujanandini
- ‘Ritumati’, the drama portrayed the cloistered life led by Namboothiri women, written by:
- V.T. Bhattathiripad
- M.P. Bhattathiripad
- Kurur Nilakantan Namboothiripad
- N. Krishna Pillai
- The freedom fighter belong to famous Palakkad Anakkara Vadaketh family:
- Lalitha Prabhu
- Parvathi Nenmani Mangalam
- A.V. Kuttimalu Amma
- Arya Pallam
- Who is the social reformer voiced against caste system and untouchability through the ‘Jathikummi’?
- P.K. Chathan Master
- Vagbhatananda
- Sahodaran Ayyappan
- Pandit K.P. Karuppan
- The Kerala leader attended Coconada (Kakinada) congress session in 1923 and enlisted congress support in his fight for social justice:
- Dr. Ayyathan Gopalan
- C. Krishnan
- C.V. Kunjuraman
- T.K. Madhavan
- ‘Ente Poorvakala Smaranakal’, the work written by the political leader:
- A.K. Gopalan
- A.K. Antony
- V.T. Bhattathiripad
- E.M.S. Namboothiripad
- In which year G. Sankara Kurup got the Bharatiya Gnanapidham Award?
- 1968
- 1966
- 1955
- 1976
- Who is the present CEO of Rajya Sabha T.V.?
- Gurdeep Singh Sappal
- Shashi Sekhar Vempati
- P.J. Kurian
- M. Venkaiah Naidu
- Who is the winner of US open badminton Championship Men’s Single held at California in 24th July 2017?
- H.S. Pranoy
- Parupalli Kashyap
- Kidambi Srikanth
- Sai Praneeth
- Who is the director of controversial Bollywood film ‘Indu Sarkar’?
- Tigmanshu Dhulia
- Madhur Bhandarkar
- Sayed Ahamed Afzal
- Mohit Marwah
- Who is the present Chairman of NITI Aayog?
- Dr. Rajiv Kumar
- Aravind Panagaria
- Amitabh Kanth
- Sri. Narendra Modi
- ‘Freedom From Waste’ campaign launched by:
- Suchithwa Mission
- Swachh Bharath
- Life Mission
- Haritha Kerala Mission
Question Error
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