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ITI Previous Papers REFRIGERATION AND AIR CONDITIONING TECHNICIAN(NSQF)

PREVIOUS YEAR PAPER
TRADE NAMEREFRIGERATION AND AIR CONDITIONING TECHNICIAN(NSQF)
TRADE TYPEEngineering
YEAR2
EXAM DATE2025-04-15
EXAM TIME09:00:11:00
Question Paper MOCK TEST

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TRADE THEORY

Which pressure is prefered to maintain the entire HVAC system during cleaning process?

  1. Neutral pressure
  2. Atmospheric pressure
  3. Positive pressure
  4. Negative pressure

What is the expansion of ADP?

  1. Advanced Detection Process
  2. Appliance Durability Promotion
  3. Advanced Distributor Process
  4. Apparatus Dew Point

Which one is thermostat in figure?

  1. 2
  2. 3
  3. 4
  4. 1

What is the name of part marked as X in oil separator?

  1. Screens
  2. Float valve
  3. Oil return line
  4. Discharge gas line

Which equipment that increases the pressure of the gas by compressing in refrigeration cycle?

  1. Condenser
  2. Expansion device
  3. Compressor
  4. Evaporator

Which refrigerant is ozone friendly used in cold storage?

  1. NH3
  2. CFC - 12
  3. CFC - 11
  4. HCFC - 22

Which non-positive displacement compressor is used in RAC plants?

  1. Centrifugal
  2. Scroll
  3. Reciprocating
  4. Screw

Which unit in Refrigeration sector known as refrigerated cabinet that displays merchandise as well as cools it?

  1. Refrigerator
  2. Visible cooler
  3. Domestic coolers
  4. Bottle coolers

Which area of chilled water insulation is shown in figure?

  1. Chilled water straight pipe
  2. Chilled water elbows
  3. Chilled water reducer
  4. Chilled water flange, couplings

What is the advantage of using indirect expansion chiller AC system?

  1. Less quantity of secondary refrigerant
  2. Cooling tower is not needed
  3. Less quantity of primary refrigerant
  4. Quick cooling

Which one is condensing unit shown in figure?

  1. W
  2. Z
  3. Y
  4. X

What is the name of temperature measured by an odinary thermometer?

  1. Dew point thermometer.
  2. Dry bulb temperature
  3. Wet bulb temperature
  4. Absolute temperature

What kind of heat is absorbed during evaporation?

  1. Latent heat
  2. Specific heat
  3. Super heat
  4. Sensible heat

What type of acid is used with water for De-scaling of water cooled condenser?

  1. Carbolic acid
  2. Nitric acid
  3. Sulphuric acid
  4. Hydro chloric acid

Which one indicates thermostat in wiring circuit?

  1. X
  2. Y
  3. W
  4. Z

What is the name of line marked as X?

  1. Charging line
  2. Suction line
  3. Delivery line
  4. Liquid line

What is the purpose of valves in chiller AC plants?

  1. Removes dust
  2. Regulate the flow of water
  3. Control air flow
  4. Increase pressure

Which component is an automatic reset device. Which will trip the compressor when low side pressure falls?

  1. Over load relay
  2. High pressure cut out
  3. Water flow switch
  4. Low pressure cut out

Which compressor employs suction valve lifting mechanism for capacity control?

  1. Reciprocating
  2. Rotary
  3. Centrifugal
  4. Screw

What is the minimum temperature difference in water required between inlet and outlet of water cooled condenser?

  1. 15oC
  2. 20oC
  3. 5oC
  4. 10oC

What is the name of device marked as‘x’?

  1. Diffuser grill
  2. Butterfly damper
  3. Splitter damper
  4. Multiple vane damper

How many water drain lines are provided for each evaporator in a bus AC?

  1. Three
  2. Two
  3. Four
  4. One

Which operation is done to remove air from the system and charging hoses using ECU station?

  1. Flushing
  2. Evacuation
  3. Pump down
  4. Cleaning

What is the process of removing the frost accumulated in the surface of evaporator?

  1. Descaling
  2. Frosting
  3. Defrosting
  4. Scaling

Which sector generally uses visible cooler?

  1. Industrial
  2. Domestic
  3. Production
  4. Commercial

Which colour code indicates the earth wire in power supply cord?

  1. Red
  2. Green/yellow
  3. Black
  4. Brown

Which version of motors are used in ductless multisplit system?

  1. Constant frequency drive
  2. Variable frequency drive
  3. Bioptional drive
  4. Trioptional drive

What is the dew point depression of air if dry bulb and dew point temperatures are 36oC and 32oC respectively?

  1. 4oC
  2. 6oC
  3. 8oC
  4. 2oC

In which circuit of water cooler, relay is used to control the both running and starting capacitors?

  1. RSCR
  2. PSC
  3. CSIR
  4. CSR

What is the name of fan coil units which have two supply pipes and two return pipes?

  1. Two-pipe fan coil unit
  2. Dual -pipe fan coil unit
  3. Multi flow-pipe fan coil unit
  4. Four-pipe fan coil units

How the total heat of air is represented in psychrometric chart?

  1. Latent heat
  2. Sensible heat
  3. Entropy
  4. Enthalpy

What is the name of part marked as X in a split casing pump?

  1. Shoulder ring
  2. Casing
  3. Water deflector
  4. Impeller

Which type of AC system is operated by VRV system?

  1. Multizone split ACs
  2. Central plant AC
  3. Indirect ACs
  4. Package AC

Which device is installed in ducts to control air flow?

  1. Grill
  2. Register
  3. Damper
  4. Diffuser

What is the name of part marked as X in belt driven type fan?

  1. Scroll
  2. Bearings
  3. Belt guard
  4. Wheel

Which process is done by refrigerant control in vapour compression system?

  1. Condensation
  2. Filtering
  3. Expansion
  4. Evaporation

Which lowest temperature of water is achieved in cooling tower?

  1. Dry bulb temperature of air
  2. Apparatus dew point temperature
  3. Wet bulb temperature of air
  4. Dew point temperature of air

Which type of bottle cooler gains the minimum heat during door opening?

  1. Right side open
  2. Vertical
  3. Left side open
  4. Horizontal

WORKSHOP CALCULATION AND SCIENCE

What is the direction of frictional force against a motional object?

  1. Opposite to the object
  2. Parallel to the object
  3. Inclined to the object
  4. Perpendicular to the object

What is the centre of gravity of a sphere?

  1. At the diameter
  2. On the circumference
  3. At the radius
  4. At the centre

What is the unit of strain?

  1. Kg/cm2
  2. Newton/metre2
  3. Metre
  4. No unit

Where the centre of gravity of a circle lies?

  1. At its centre
  2. Any where on its radius
  3. Any where on its circumference
  4. Any where on its diameter

What is the name of the structure formed, if a steel is heated for about 723oC?

  1. Cementide
  2. Austenite
  3. Ferrite
  4. Martensite

Which symbol is used to denote co-efficient of friction?

  1. β (Beta)
  2. μ (Meu)
  3. α (Alpha)
  4. γ (Gamma)

ENGINEERING DRAWING

Which is not a part of refrigeration cycle?

  1. Compressor
  2. Freezer
  3. Thermostat
  4. Condenser

Identify the symbol.

  1. Connecting wire
  2. Battery
  3. Single cell
  4. Diode

Thermoelectric refrigeration system is based on______

  1. static effect
  2. peltier effect
  3. seeback effect
  4. Joule effect

Tubular heat exchanger symbol is…..

What is the name of the symbol?

  1. Capacitor
  2. Diode
  3. Battery
  4. Lamp

Which is the symbol of air dryer?

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