Post : A/C Mechanic
Department : Kerala Tourism Development Corporation KTDC
Category Code : 112/17
Qualification : SSLC + NTCT MRCA or A/C mechanic
Question Paper Code : 132/17
Date of Test : 13-11-2017
If you find mistakes, comment below
- What thickness of metal sheets are called as plates?
- Above 3 mm
- Above 5 mm
- Above 7 mm
- Above 10 mm
- What gases are used for the application underwater gas cutting of steel?
- Oxygen-coal
- Oxygen-LPG
- Oxygen-Hydrogen
- Oxygen-Acetylene
- In which gas welding technique the blow pipe and filler rod angles are 50 and 40 respectively with the welding line?
- Rightward
- Leftward
- Rightward and Leftward
- All of these
- Soldering & Brazing are the examples of non-fusion welding
- Fusion welding
- Non-fusion welding
- Pressure welding
- Forge welding
- Which type of artificial respiration method must not be used for the victim has injuries to the chest and belly?
- Mouth to mouth method
- Schafer’s method
- Nelson’s arm – lift back-pressure method
- Mouth to nose method
- Metering device used in car air-conditioner
- Electronic expansion valve
- Automatic expansion valve
- Capillary tube
- Thermostatic expansion valve
- VRV stands for _________
- Varying Recirculated Volume
- Variable Refrigerant Volume
- Varying Refrigerant Volume
- None of these
- The package AC comes in capacity _________.
- less than 2 TR
- between 2 to 4 TR
- between 5 to 15 TR
- more than 25 TR
- Rawl plug tool is used for making _________.
- Bending
- Grinding
- Cutting
- Hole
- Commercial reciprocating compressor lubricated by
- Forced feed
- Splash lubrication
- Machine lubrication
- None of these
- Centrifugal switch disconnected after the rotor has reached _________ of the rated speed.
- 50 to 55%
- 55 to 60%
- 70 to 75%
- 75 to 80%
- Why is three phase induction motor self starting?
- phase angle difference 60
- phase angle difference 180
- phase angle difference 90
- phase angle difference 120
- Standard atmospheric pressure is
- 1.0332 kg f/sq.cm.
- 1.332 kg f/sq.cm.
- 2.0332 kg f/sq.cm.
- All these
- Chemical formulae of R-600 a
- C5H12
- C2H6
- C3H8
- C4H10
- What is general chemical formula for finding Refrigerant Numbering?
- CmHnClpFq and n + p + q = 2p + 2
- CmHnClpFq and n + p + q = 2m + 2
- CmHnClpFq and n + p + q = 2n + 2
- CmHnClpFq and n + p + q = 2q + 2
- What is the colour code of Refrigerant 410 A?
- Rose
- Orange
- Chocolate Brown
- Coral Red
- The various methods of duct design are _________
- Equal friction method
- Velocity reduction method
- Static regain method
- All of these
- ‘HEPA’ stands for _________.
- High Energy Particulate Air
- High Efficiency Particulate Air
- High Entry Particulate Air
- Highly Effective Pressurized Air
- As the engine speed decreases, the cooling capacity of the car AC system _________.
- increases
- remains unchanged
- decreases
- may increase or decrease depending on number of persons traveling in car
- Refrigerant 407 C is combination of _________.
- R-290 & R-1270
- R-600a & R-134a
- R-125, R-600 & R-134a
- R-32, R-125 & R-134a
- What is temperature of Neutral flame in Oxy-Acetylene Brazing set?
- 2200 C
- 3200 C
- 4200 C
- 5200 C
- 1 micron = _________ millimetre of Hg.
- 1/100
- 1/1000
- 1/10000
- 1/10
- Azeotropic Mixtures are designed by _________ series.
- 500
- 400
- 700
- 600
- How are the reciprocating compressor classified depending on working?
- Vertical & Horizontal
- Single & Double acting
- Open type & Semi sealed
- Semi & Hermetically sealed
- GWP of R-11 is
- 8500
- 5400
- 4500
- 1800
- How much air is normally required for the working of air-cooled condenser per ton of refrigeration?
- 50 to 55 cu.m/min.
- 30 to 35 cu.m/min.
- 20 to 25 cu.m/min.
- 60 to 65 cu.m/min.
- The thermistors are _________
- pressure type temperature sensors
- bellow type temperature sensors
- resistance type temperature sensors
- all of these
- What are the examples of non-fusion welding?
- Arc welding
- Oxy-Acetylene welding
- Soldering
- None of these
- Alternative refrigerant of R-22
- R-401 A
- R-410 A
- R-500
- R-507
- Voltage rating of starting capacitor used in ACs
- 410 V
- 230 V
- 440 V
- 110 V
- 50 F is _________
- 12.5 C
- 5 C
- 7.5 C
- 10 C
- What is a Rectifier?
- DC to AC converter
- AC to DC converter
- Both 'DC to AC converter' and 'AC to DC converter' possible
- None of these
- What is the voltage required for LED?
- 1.2 – 2.5 V
- 2.2 – 3.5 V
- 3.2 – 4.5 V
- 4.2 – 5.5 V
- How many diodes are there in a bridge rectifier?
- 2
- 3
- 4
- 6
- Which is the semi-conductor device with three terminals and used for amplifying electric and electronic signals?
- Diode
- Transistor
- Capacitor
- Zener diode
- What type of relay is used in RSIR?
- Voltage type relay
- Hotwire relay
- PTC relay
- Current coil relay
- The vapour pressure of refrigerant should be
- lower than atmospheric pressure
- higher than atmospheric pressure
- equal to atmospheric pressure
- none of these
- One of the purposes of sub-cooling the liquid refrigerant is to
- reduce compressor over-heating
- reduce compressor discharge temperature
- increase cooling effect
- ensure that only liquid and not the vapour enters the expansion valve
- At lower temperatures and pressures, the latent heat of vaporization of a refrigerant
- decreases
- increases
- remains same
- depends on other factors
- For ammonia refrigerating systems, the tubes of a shell and tube condenser are made up of
- Copper
- Steel
- Aluminium
- Brass
- The higher temperature in vapour compression cycle occurs at __________.
- Receiver
- Expansion valve
- Condenser discharge
- Compressor discharge
- Latent heat of vaporization at 5 F (Btu/lb) of R-134 a is __________.
- 66.2
- 99.2
- 103.3
- 89.3
- The weight of HC charged to the system for drop in conversion from CFC 12 to HC is
- 120%
- 100%
- 60%
- 40%
- Most of the refrigerants including CFCs, HCFcs, HFCs and HC blend are __________.
- Non-toxic
- Corrosive
- High density
- Non-flammable
- A refrigerant recovery unit needs the filter drier change, approximately after __________.
- 50 to 60 hours of operation
- 100 hours of operation
- every 24 hours
- every time before recover refrigerants
- The clearance between rotor and stator varies according to the __________.
- Coil of the motor
- Air passage
- Cable size
- Size of the motor
- The ball bearing of electrical motor are lubricated by __________.
- Oil
- Grease
- Air
- Water
- Which causes clogging at the expansion valve?
- Oil
- Dust particles
- Moisture
- Impurities
- The reason for the thermostat switch to become defective is __________.
- Moisture in the system
- Lack of lubrication oil to compressor
- Carbon formation of contact points
- OLP is not functioning
- High pressure cut off is used to __________
- cut off power supply to condenser fan motor if pressure increases beyond the preset value.
- cut off power supply to compressor motor if pressure increases beyond the preset value.
- cut off power supply to evaporator fan motor if pressure increases beyond the preset value.
- None of these
- Air velocity is measured by __________.
- Tachometer
- Anemometer
- Hydrometer
- Thermometer
- The solenoid valve operated by __________.
- Hand operated
- Oil pressure operated
- Gas pressure operated
- Electrically operated
- Brine solution circulation pump consists of __________.
- Piston type
- Gear type
- Rotary type
- Rotating vane type impeller
- A water cooler is having 4 kg (weight) quantity of R-12, if you retrofit with HFC for the same machine. How much quantity is weight of 134a you will charge?
- 3.8 kgs.
- 3.2 kgs.
- 2.4 kgs.
- 1.6 kgs.
- Ice cream storage plant thermostat thermal bulb is located ________.
- near suction line
- at liquid line
- inside the storage compartment
- in brine solution
- The function of duct in air conditioning unit is _________
- Air cooling
- Air cleaning
- Air drying
- Air distributing
- A cooling tower’s warm water inlet temperature is 44 C, sump water outlet temperature is 32 C, surrounding air wet bulb temperature is 24 C. Find out the efficiency of the cooling tower in percentage.
- 60%
- 40%
- 80%
- 75%
- The cut-in and cut-out set pressure difference is called
- set pressure
- differential pressure
- cut-out pressure
- cut-in pressure
- Compressor motor protected by the ___________.
- low pressure switch
- overload protector
- high pressure switch
- temperature control
- The purified, conditioned air improves the ___________.
- Breathing of human
- Cleaning of AC room
- Performance of the system
- Quality of the air filters
- Which instrument is used to measure relative humidity?
- Hydrometer
- Psychrometer
- Hygrometer
- Thermometer
- What is the purity of dry nitrogen for flushing?
- 10 ppm
- 15 ppm
- 3 ppm
- 8 ppm
- By using which valve in the charging line, the refrigerant can be recovered?
- Service valve
- Hand shut off valve
- Piercing valve
- Double stage regulator
- The relationship between rotor speed ‘N’, frequency ‘f’ and number of poles ‘p’ is given by relation
- N = 120 f/p
- PN = 120/p
- f = 120 N/p
- N = 120 p/f
- A oil separator is necessary in discharge line to return the oil to the compressor in case of ______
- R-290
- R-717
- R-12
- R-600a
- An evaporative condenser is a _________.
- Air cooled condenser
- Water cooled condenser
- Both air and water cooled at the same time
- None of these
- Approach of a cooling tower is defined as the
- difference of dry bulb temperature of surrounding air and temperature of water leaving the cooling tower.
- difference of temperature of water leaving the cooling tower and wet bulb temperature of surrounding air.
- difference of temperature of water leaving the cooling tower and temperature of water entering the cooling tower.
- None of these
- In a induced draft cooling tower, the fan is fixed at the _________.
- top of the cooling tower
- middle of the cooling tower
- bottom of the cooling tower
- any location of the cooling tower
- A thermostatic expansion valve is based on the principle of maintaining a constant degree of superheat at the _________.
- discharge of compressor
- exit of the condenser
- exit of capillary tube
- exit of evaporator
- The eliminators at the air washers avoid the
- Air flow
- Water particles in the air
- Water flow
- Dehumidification
- External equalizer is used with _________
- AEV
- TEV
- High side flat valve
- Low side flat valve
- Normally pressure relief valves are mounted on _________ in a refrigeration plant.
- compressor
- receiver
- condenser
- evaporator
- The best refrigerant is one for which _________.
- ODP = 1
- ODP = 0.5
- ODP = 0.75
- ODP = 0
- Relative COP = _________
- Actual COP / Theoretical COP
- Theoretical COP / Actual COP
- Actual COP · Theoretical COP
- None of these
- The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called
- Sub-cooling
- Super-cooling
- Normal cooling
- None of these
- On P-H diagram, the isentropic compression process is represented by an
- Inclined line
- Vertical line
- Horizontal line
- Curved line
- The super-heating in a refrigeration cycle
- Does not alter COP
- Increase COP
- Decrease COP
- None of these
- How many numbers of orbits in the orbiting scroll of scroll compression process?
- Three
- Four
- Two
- One
- Most air cooled condensers are designed to operate with a temperature difference of
- 6 C
- 9 C
- 14 C
- 24 C
- The centrifugal compressor are generally used for refrigerants that require
- small displacements and low condensing pressure.
- large displacements and high condensing pressure.
- small displacements and high condensing pressure.
- large displacements and low condensing pressure.
- Eastern most point of India is ___________
- Indira Point
- Cape Comerine
- Indira Col
- Kibithu
- ___________ is the only Indian State through which the Indus flows.
- Jammu Kashmir
- Gujarat
- Rajasthan
- Haryana
- The coldest place in India is ___________.
- Drass Valley
- Shimla
- Kashmir
- Kodaikanal
- North-east monsoon is commonly known as
- Graphic rainfall
- October heat
- Cherri Blossom
- Mango shower
- Red colour of the ‘red soil’ is due to the high concentration of ___________.
- Calcium oxide
- Aluminium oxide
- Iron oxide
- Sodium chloride
- Egg bowl of India is ___________.
- Kerala
- Assam
- Andhra Pradesh
- Arunachal Pradesh
- Who is the Father of Indus Economics?
- Dadabhai Naoroji
- M. Viswesarayya
- Jawaharlal Nehru
- Sardar Patel
- First Five Year Plan gave priority to ___________
- Poverty Alleviation
- Industrialisation
- Agricultural Development
- Reducing Unemployment
- The first session of Swaraj Party was held at
- Delhi
- Allahabad
- Lahore
- Calcutta
- Ancient University named ‘Kandallursala’ situated in
- Wyanad
- Alappuzha
- Thiruvananthapuram
- Kollam
- The first floating ATM in Kerala is started in
- Ernakulum
- Thiruvananthapuram
- Thrissur
- Calicut
- Almost 68% of the total area of Kerala is ___________ soil group.
- laterite
- red
- black
- alluvial
- Which river in Kerala is known as ‘Baris’ in ancient days?
- Pamba
- Bharatapuzha
- Periyar
- Chandragiri
- Who is known as ‘Father of Modern Kerala Renaissance’?
- Sri Narayana Guru
- Chattambi Swamikal
- Ayyankali
- Vagbhadananda
- Who called Ayyankali as ‘Pulayaraja’?
- Jawaharlal Nehru
- Indira Gandhi
- Mahatma Gandhi
- E.K. Nayanar
- Who is the returning officer for the election to Vice President of India?
- Attorney General of India
- Chief Election Commissioner
- Secretary Lok Sabha / Rajya Sabha
- Chief Justice of India
- World Athletic meet 2017 take place at
- London
- Tokyo
- Helsinki
- Rio-de-Janeiro
- Who is the French President?
- Tony Blair
- Emmanuel Mucro
- Nawab Sharif
- Samuel Mucro
- In which year Olympics will take place in Los Angeles for the third time?
- 2024
- 2028
- 2020
- 2027
- Who is the Vice President of India?
- Dr. Hameed Ansari
- Dr. Pranab Mukherjee
- Venkaiyya Naidu
- Ramnath Kovind
1 Comments
In question number 67 approach of cooling tower is water leaving the coling tower and wet bulb temperature of surround air that is correct option B is correct option C is incorrect
ReplyDelete