Quiz Questions

ITI Quiz - 10-Jun-2026 09:01 AM (ITISKILL0350BE)

Q-Paper A-Paper
Question 1 1 Marks
How many speed selection is used with indoor air blower in ductable multi split AC?
A
One - speed
B
Two - speed
C
Three - speed
D
Four - speed
Question 2 1 Marks
Why the idler pulley is used in belt driven car AC?
A
Decrease the belt vibration
B
Increase the belt tension
C
Increase the feathering
D
Decrease the belt tension
Question 3 1 Marks
What type of compressor motor is used in inverter split AC?
A
Constant speed compressor motor
B
Centrifugal compressor motor
C
Open type compressor motor
D
Variable speed motor
Question 4 1 Marks
Which fan motor speed is used with outdoor unit in split AC?
A
Single speed
B
Double speed
C
Triple speed
D
Five speed
Question 5 1 Marks
Which fan is used in condensing unit of ductable split air conditioner?
A
Forward curved fan
B
Centrifugal fan
C
Propeller fan
D
Radial fan
Question 6 1 Marks
Which material is used for making service valve?
A
Brass
B
Cast iron
C
Aluminium
D
Stainless steel
Question 7 1 Marks
What type of material is used to support the tubes on both sides of air cooled condenser?
A
Copper sheets
B
Mild steel sheet
C
Aluminium sheets
D
Galvanised iron sheets
Question 8 1 Marks
What is the cause of water leakage in indoor unit of multi split AC?
A
Efficient water pump
B
Drain line not properly installed
C
Condenser water pump defective
D
Over flow of water from cooling tower sump
Question 9 1 Marks
Which type of fan blade is used with indoor unit?
A
Guide vane
B
Blower
C
Axial
D
Vane|
Question 10 1 Marks
Which valve helps to attend mechanical faults without wasting the gas in split AC?
A
Gate valve
B
Float valve
C
Service valve
D
Expansion valve
Question 11 1 Marks
How many fan motors are used in split AC?
A
Two
B
Five
C
Four
D
Three
Question 12 1 Marks
Which motor is used to drive the condenser fan of out-door unit in ductable split air conditioner?
A
Capacitor start capacitor run motor
B
Three phase induction motor
C
Permanent split motor (PSC)
D
Shaded pole motor
Question 13 1 Marks
What is the purpose of providing gas ballast in two stage rotary vacuum pump?
A
Avoid condensation of water vapour
B
Prevent condensation of nitrogen
C
Prevent condensation of dry air
D
Avoid condensation of refrigerant
Question 14 1 Marks
Which insulating material is used in duct work?
A
Wood
B
Plastic
C
Rubber
D
Glass wool
Question 15 1 Marks
Which is the source of drive for compressor shaft in car AC?
A
Magnetic clutch
B
Condenser fan
C
Engine shaft
D
Blower fan
Question 16 1 Marks
What is the advantage of ductable air conditioner over window air conditioner?
A
Higher cost
B
Noisy operation
C
Silent operation
D
Needs more space
Question 17 1 Marks
Which type fan blade is used with out door unit of split AC?
A
Vane
B
Guide vane
C
Propeller
D
Centrifugal
Question 18 1 Marks
Which causes the clogged orifice in TEV of car AC system?
A
Nitrogen
B
Oxygen
C
Moisture
D
Non condensable gases
Question 19 1 Marks
Which device switches ON/OFF the car AC compressor?
A
Crank shaft
B
Blower unit
C
Rotor winding
D
Magnetic clutch
Question 20 1 Marks
What is the effect of longer suction and liquid piping in AC?
A
No pressure rise
B
More pressure drop
C
Less pressure drop
D
Medium pressure rise
Question 21 1 Marks
Where the refrigerant is stored in split AC during pump down operation?
A
Accumulator
B
Compressor
C
Evaporator
D
Condenser
Question 22 1 Marks
What is the effect of increased out door temperature in car AC?
A
Compressor runs more time
B
Compressor runs less time
C
Performance remains the same
D
Performance increases
Question 23 1 Marks
Which type of switch is used to control the room air temperature in split AC?
A
Over load protector
B
Thermostat switch
C
Manual switch
D
Thermal relay
Question 24 1 Marks
Why CFC 12 system is replaced by HFC 134a system in car AC?
A
Increase ODP
B
Increase GWP
C
GWP becomes zero
D
ODP becomes zero
Question 25 1 Marks
Which speed is recommended for checking optimum performance in car AC?
A
1600 rpm
B
2600 rpm
C
3600 rpm
D
4600 rpm
Question 26 1 Marks
Which bearing is used in condenser motor of outdoor unit in ductable multi split air conditioner?
A
Open ball bearing
B
Thrust bearing
C
Sleeve bearing
D
Ball bearing
Question 27 1 Marks
What is the use of magnetic clutch in Car AC?
A
Indicate liquid level in the compressor
B
Indicate oil level in the compressor
C
Control ON/OFF for compressor
D
Add oil in the system
Question 28 1 Marks
Which is the mounting location of evaporator in ductable split unit?
A
Floor mounting
B
Wall mounting
C
Ceiling mounting
D
Roof mounting
Question 29 1 Marks
What is the cause for noise in indoor unit of a multi split air conditioner?
A
Refrigerant leak
B
Blower is loosened
C
Running current is high
D
Compressor not working
Question 30 1 Marks
Where the liquid refrigerant is stored in multi split Air-conditioner during pump down operation?
A
Evaporator
B
Condenser
C
Accumulator
D
Liquid receiver
Question 31 1 Marks
Which component belongs to indoor unit of split AC?
A
Compressor
B
Condenser
C
Evaporator
D
Drier
Question 32 1 Marks
Which material is used to make ducts in split AC?
A
Thermocole
B
GI sheet
C
Wood
D
Fibre
Question 33 1 Marks
Which is sensed by TEV in response to heat load variation?
A
Sub cool in liquid line
B
Discharge temperature
C
Super heat in suction line
D
Evaporating temperature
Question 34 1 Marks
What is the function of remote control in split AC?
A
Humidity setting
B
Pressure setting
C
Drain water control
D
Transmits signal to operate AC
Question 35 1 Marks
What is ensured before mounting condenser in car AC?
A
Accessibility for future service
B
Condenser top line to TEV inlet
C
Condenser in line with car radiator
D
Condenser bottom line to discharge line
Question 36 1 Marks
Which motor is used to drive the blower of indoor unit in ductable split air conditioners?
A
Shaded pole motor
B
Permanent split capacitor motor
C
Three phase induction motor
D
Capacitor start capacitor run motor
Question 37 1 Marks
What are the multi speed of blower motor used in indoor unit of ductable split air conditioner?
A
ow - 500 rpm, medium - 550rpm, high - 720 rpm
B
Low - 800 rpm, medium - 850rpm, high - 920 rpm
C
Low - 900 rpm, medium - 950rpm, high - 1100 rpm
D
Low -1000 rpm, medium -1200rpm, high -1350 rpm
Question 38 1 Marks
What is the test pressure of cooling coils during manufacture?
A
150 psig
B
250 psig
C
350 psig
D
450 psig
Question 39 1 Marks
How the pressure drop of refrigerant flow is minimised during installation of indoor and outdoor units in ductable split AC?
A
Pipe lines with more joints
B
With more horizontal distance
C
System pipes with minimum bends
D
Install units as far as possible
Question 40 1 Marks
Which bearing is used in blower motor of indoor unit in ductable split air conditioner?
A
Ball bearing
B
Thrust bearing
C
Sleeve bearing
D
Open ball bearing
Question 41 1 Marks
Which process is done first in split AC for shifting from one place to another?
A
Flushing
B
Evacuation
C
Pump down
D
Vacuumisation
Question 42 1 Marks
What is the use of anemometer?
A
Check water flow
B
Measure air flow
C
Produce current
D
Measure voltage
Question 43 1 Marks
Which safety control is electrically connected in series with magnetic clutch of compressor in car AC?
A
TEV
B
AEV
C
HPC
D
EEV
Question 44 1 Marks
What is the cause of reduction in fan's air flow?
A
Leak in the system
B
Fan capacitor is weak
C
Refrigerant under charge
D
Supply voltage is normal
Question 45 1 Marks
Where the filter drier is installed in a car AC system?
A
Liquid line
B
Suction line
C
Service line
D
Discharge line
Question 46 1 Marks
What is the reason for sweating of water on drier filter?
A
Air filter blocked
B
Partially chocked drier filter
C
More air flows through the evaporator
D
Dust accumulated on condenser
Question 47 1 Marks
What is the velocity range of air circulated in car AC?
A
2 - 3 m / sec
B
5 - 7 m / sec
C
7 - 9 m / sec
D
9 - 10 m / sec
Question 48 1 Marks
What is the function of starting capacitor in CSIR motor?
A
Gives initial torque
B
Gives running torque
C
Corrects power factor
D
Improves energy efficiency
Question 49 1 Marks
What is indicated by the bubbles in car AC's sight glass?
A
Pressure of air
B
Poor compression
C
Excess of refrigerant
D
Shortage of refrigerant
Question 50 1 Marks
What is the effect of operating the compressor under 5 of Hg vacuum during pump down process?
A
Pumps oil to condenser
B
Prevent motor damage in dome
C
Prevent leakage in service valve
D
Prevent piston damage
Question 51 1 Marks
Which control switch is connected in series with magnetic clutch in Car AC wiring?
A
Piston pin
B
Thermostat control
C
Automatic expansion valve
D
Thermostatic expansion valve
Question 52 1 Marks
What is the advantage of inverter split AC?
A
Eliminates compressor
B
High energy efficiency
C
Low energy efficiency
D
Current drawn is high
Question 53 1 Marks
What is the reason for poor condensation in split AC?
A
High ambient temperature
B
Low ambient temperature
C
Condenser tube leaky
D
Blower motor failure
Question 54 1 Marks
What is ensured before starting a vacuum pump?
A
Correct oil level
B
Capacity of the pump
C
Weight of vacuum pump
D
Available ac power supply
Question 55 1 Marks
Which control opens the compressor motor circuit in the event of continuous overload?
A
Thermostat
B
Fusible plug
C
Bimetal strip
D
Spring loaded relief valve
Question 56 1 Marks
Which device engages the compressor shaft in car AC?
A
Thermo switch
B
Car engine pulley
C
Over load protector
D
Electro magnetic clutch
Question 57 1 Marks
Which refrigerant control is used in car AC?
A
Hand shut off valve
B
Automatic expansion valve
C
Thermostatic expansion valve
D
Thermal electric expansion valve
Question 58 1 Marks
What is the effect on defective thermostat sensor in split AC?
A
Unit consumes less power
B
Increases super heat
C
AC unit runs continuously
D
Relay malfunctions
Question 59 1 Marks
How long the filter drier unit is used in car AC?
A
1 year
B
2 years
C
3 years
D
4 years
Question 60 1 Marks
Which part of car AC compressor actuates the piston directly?
A
Crank shaft and connecting rod
B
Rotor and stator
C
Swash plate
D
Blower unit
Question 61 1 Marks
What tonnage capacity of split AC unit uses 150/200 MFD starting capacitor?
A
1 TR
B
1.5 TR
C
2.0 TR
D
2.5 TR
Question 62 1 Marks
Which level of vacuum is required before charging HFC 134a in car AC?
A
500 micron
B
400 micron
C
300 micron
D
200 micron
Question 63 1 Marks
What is the maximum TR capacity operated with Single phase AC supply?
A
1.00 TR
B
1.5 TR
C
2.0 TR
D
5 TR
Question 64 1 Marks
What is the reason for no cooling effect in car AC?
A
Air in the system
B
Excess of refrigerant
C
Refrigerant leaked
D
Moisture in the system
Question 65 1 Marks
Which is the accurate method of refrigerant charging in car AC?
A
Weighing method
B
Dial a charge method
C
Suction pressure method
D
Sight glass bubbles method
Question 66 1 Marks
Which horizontal distance is preferred between indoor and outdoor units in ductable split AC installation?
A
15 meters
B
12 meters
C
20 meters
D
25 meters
Question 67 1 Marks
What is the reason for air conditioner running continuously but no cooling effect ?
A
Condensation poor
B
Refrigerant is more
C
Refrigerant leaked
D
Over charged oil
Question 68 1 Marks
What is the differential of control switch if it cuts in at 29 kg/cm<sup>2</sup> and cuts out at 34 kg/cm<sup>2</sup>?
A
5 kg / cm<sup>2</sup>
B
10 kg / cm<sup>2</sup>
C
15 kg / cm<sup>2</sup>
D
20 kg / cm<sup>2</sup>
Question 69 1 Marks
Which component belongs to outdoor unit of split AC?
A
Blower
B
Air filter
C
Compressor
D
Evaporator coil
Question 70 1 Marks
What is the advantage of periodical cleaning of air filter?
A
Decrease the volume of air handling
B
Increase the speed of fan motor
C
Decrease the cooling capacity
D
Increase the cooling capacity
Question 71 1 Marks
What is the test pressure of condenser coils during manufacture?
A
450 psig
B
350 psig
C
250 psig
D
150 psig
Question 72 1 Marks
Which part of the compressor converts rotary into reciprocating motion of piston in car AC?
A
Connecting rod
B
Magnetic clutch
C
Swash plate
D
Crank shaft
Question 73 1 Marks
What is the cooling capacity for 1.5 Ton of ductable split air conditioner?
A
3500 Kcal/hr
B
4000 Kcal/hr
C
4500 Kcal/hr
D
5000 Kcal/hr
Question 74 1 Marks
Which device equalizes the pressure between low and high side of split AC during ?OFF? cycle?
A
Suction tube
B
Copper tube
C
Capillary tube
D
Discharge tube
Question 75 1 Marks
What is the cause for noisy fan motor in outdoor unit of split AC?
A
Bearing worn out
B
Motor Burnt
C
Shaft struck
D
Blade bent
Question 76 1 Marks
What is the reason for poor cooling effect in multi split air conditioner?
A
Efficient compressor
B
Proper condensation
C
Good insulation
D
Dirty air filter
Question 77 1 Marks
What is the diameter of liquid line used with 5 TR if the suction line is 7/8 OD by up flow?
A
1/2? OD
B
5/16 ? OD
C
3/8 ? OD
D
3/4 ?OD
Question 78 1 Marks
What is the advantage of multi split air conditioners?
A
One outdoor unit for one indoor unit
B
two outdoor units for one indoor unit
C
Several outdoor units for one indoor unit
D
One outdoor unit for several indoor units