| Post Name | AC Plant Operator - Kerala State Film Development Corporation Ltd |
|---|---|
| Question Paper Code | 148/2023/OL |
| Category Code | 276/2022 |
| Date of Test | 8 September 2023 |
| Exam Type | Online Examination |
| Total Questions | 100 |
1
Which one of the following statement is not include the category of general safety? (i) Keep the ļ¬oor and gang ways clean and clear (ii) Move with care in the workshop, do not run (iii) Cut the hair short (iv) Don't walk under suspended loads
Answer
A. Only (iii)
2
Which one of the following statement is correct about the electrical safety? (i) Only qualiļ¬ed persons should do electrical work (ii) keep the workshop ļ¬oor clean, and tools in good condition (iii) Do not work on live circuits if unavoidable, Use rubber gloves rubber mats etc (iv) All of the above
Answer
B. Only (iv)
3
Which one of the following statement is not true about the scriber? (i) In layout work it is necessary to scribe lines to indicate the dimensions of the workpiece to be ļ¬led or machined (ii) It is made of high carbon steel and hardened (iii) It is used for scribing circles arcs and for transferring and stepping distances (iv) For drawing clear and sharplines, the point should be ground and honed frequently for maintaining its sharpness
Answer
C. Only (iii)
4
Which one of the following statement is not correct of an Engineering's hammer? (i) Hammer is a hand tool used for striking purposes while punching, bending straightening, chipping forging or rivetting (ii) The major parts of a hammer are the head and the handle (iii) Hammer is made of drop forged carbon steel (iv) An Engineer's hammers are speciļ¬ed by their Length
Answer
C. Only (iv)
5
Which statement is correct about the outside micrometer (i) It is a precision instrument used to measure a job within an accuracy of 0.01 mm (ii) The micrometer works on the principle of screw and nut (iii) The ratchet stop of a micrometer is to ensure that a uniform pressure between the measuring surfaces (iv) All of the above
Answer
A. Only (iv)
6
Which one of the following statement is wrong about half moon stake? (i) It has a sharp head in the form of an arc of a circle (ii) This is used when shaping and seaming funnels and tapered articles (iii) This stake has bevelled along one side (iv) It is used for turning up ļ¬anges on metal discs
Answer
C. Only (ii)
7
Which of the following statement is correct about "Dolly"? (i) Used to support the head of the rivet which is already formed (ii) Used to form the ļ¬nal shape of the rivet during riveting (iii) Used for bringing the sheet metal closely together after inserting the rivet in the hole (iv) Used for pressing the surface of the edge of the plate
Answer
A. Only (i)
8
Which of the following statement is correct for Oxy-acetylene gas ļ¬ame? (i) It is used only for brazing silver soldering and underwater gas cutting of steel (ii) Used for welding all ferrous and non ferrous metals and their alloys (iii) It has carbon and moisture eļ¬ect (iv) It is used for heating
Answer
B. Only (ii)
9
Which of the following Hand tools are used by welders during welding process? (i) Double ended spanner (ii) Chipping Hammer (iii) Tongs (iv) All of the above
Answer
A. Only (iv)
10
What is the eļ¬ect of opened resistor in series electrical circuit?
Answer
B. Total supply voltage will appear across the opened resistor
11
What is the minimum thickness of copper plate earth electrode?
Answer
D. 3.15 mm
12
Which type of damping method is used in PMMC instruments?
Answer
D. Eddy current damping
13
Which speed is called as synchronous speed in 3 phase induction motor?
Answer
C. Rotating magnetic ļ¬eld speed
14
Which type of conductor bar is used in the inner cage of double squirrel cage induction motor?
Answer
B. Copper
15
What is the application of shaded pole motor?
Answer
D. Hair dryere
16
Which type of starter is used to start and run the 3 phase slip ring induction motor?
Answer
B. Rotor resistance starter
17
What is the function of timer in automatic star delta starter?
Answer
D. Change from star to delta
18
Which doping material is used to make P-type semi conductor?
Answer
A. Boron
19
What is the main application of uni junction transistor?
Answer
D. Triggering circuits
20
What is the unit of heat in M.K.S.system?
Answer
D. K.Cal
21
Which special tool is using to measure the size of a capillary tube?
Answer
C. Capillary plug gauge
22
Using an anemometer we can measure the air velocity. What is the unit of air velocity in the options given below?
Answer
A. FPM
23
A ______ is used where the tightness of nut and bolts is a crucial parameter of assembly or adjustment
Answer
B. Torque wrench
24
The _____________ of a substance is the ratio of the density of the substance to the density of water at 4 degree celsius.
Answer
C. Speciļ¬c gravity
25
Which of the given term is also known as the "total heat content" in the measurement of heat contained in a sustance?
Answer
C. Enthalpy
26
The rate at which heat ļ¬ows a substance to another is known as
Answer
D. All of the above
27
Which gas law give us the relation between pressure (P) and Volume (V) w hen temperature (T) is kept constant?
Answer
A. Boyles Law
28
What is the boiling point of pure water in Kelvin scale?
Answer
D. 373 degree Kelvin
29
Which refrigeration system is also known as expandable refrigerant refrigeration system
Answer
B. Liquid gas refrigeration system
30
In dry ice refrigeration system, which of the following is used to cool the materials?
Answer
A. Solid carbon dioxide
31
In lithium bromide absorption refrigeration system, which of the following is used as refrigerant
Answer
B. Water
32
Which of the following compressor has the least volumetric eļ¬ciency?
Answer
A. Reciprocating
33
Why the rotary compressors are used as a vacuum pump?
Answer
A. No clearance volume
34
Which of the following compressor uses whirl vein mechanism for controlling capacity?
Answer
D. Centrifugal
35
The ratio of absolute discharge pressure to absolute suction pressure is known as?
Answer
C. Compression ratio
36
Which valves are used to perform pump down operation in a domestic air conditioning system?
Answer
B. Service valves
37
The capacity of a condenser is expressed in
Answer
D. kcal/hr
38
What is the reason for scale formation in shell and tube condenser?
Answer
D. Dissolved chemical and salts in the water
39
The type of heat removal takes place when changes the refrigerant vapour to liquid in water cooled condenser?
Answer
C. Latent heat of condensation
40
The term indicates the diļ¬erence in temperatures of inlet and outlet of cooling tower water is known as
Answer
B. Range
41
During the operation of a cooling tower, the air takes away the ļ¬ne droplets of water from cooling tower. Which term is used to denote this?
Answer
B. Drift loss
42
What is the lowest temperature of water is achieved in cooling tower?
Answer
A. Wet bulb temperature of air
43
Which expansion valve's operation is controlled by a microprocessor?
Answer
C. Electronic expansion valve
44
Which of the following expansion valve is also known as "constant pressure valve"
Answer
A. Automatic expansion valve
45
In which line, the refrigerant control is ļ¬tted in the vapour compression cycle?
Answer
D. Liquid line
46
During evaporation the refrigerant absorbs heat from the surroundings. What kind of heat is absorbed during evaporation?
Answer
C. Latent heat
47
Which of the following operating temperature is true, related to the operating condition of frosting type evaporator?
Answer
B. Below 32ĀŗF
48
In which of the following refrigerant group R-410A belongs to?
Answer
C. HFC Blend
49
Which of the following quality of refrigerant should be high?
Answer
D. Thermal conductivity
50
In which year India aim to completely ban HCFC refrigerant?
Answer
B. 2040
51
The GWP of refrigerant 1234yf is?
Answer
A. 4
52
The cylinder colour code of refrigerant 502 is?
Answer
B. Orchid
53
Refrigerator thermostat thermal bulb is clamped with?
Answer
D. Evaporator
54
The function of capillary tube in refrigerator is
Answer
B. Meters the refrigerant
55
Which type of condenser is equipped with refrigerator?
Answer
A. Plate type
56
The reason for insuļ¬cient air throw in frost free refrigerator is
Answer
C. Air distribution duct is partially chocked
57
What is the function of defrost timer in frost free refrigerator is?
Answer
C. Air distribution duct is partially chocked
58
The frequency range maintained in inverter refrigerator is
Answer
A. 40 Hz to 150 Hz
59
The temperature of water maintained in water cooler is?
Answer
C. 45 to 50Ā°F
60
The recommended vacuum level should be maintained in water cooler before charging is
Answer
D. 150 microns
61
The temperature range maintained in visible cooler is?
Answer
B. 0 to 10Ā°C
62
Freezers are usually designed to operate a temperature range of?
Answer
D. -15 to -34Ā°C
63
The type of evaporator generally used in deep freezer is?
Answer
C. Plate type
64
What is the reason to form white milky ice in ice plant?
Answer
A. Presence of air
65
The safety device which is used to protect the compressor of window air conditioner is?
Answer
B. OLP
66
In summer air conditioning, the air is
Answer
B. Cooled and dehumidiļ¬ed
67
What is the HP of a fan motor in window air conditioner of 1 ton?
Answer
C. 1/6 HP
68
The capacity of stabilizer required for 1 ton air conditioner is?
Answer
D. 3 KVA
69
The thermostat sensing bulb of window air conditioner senses which temperature?
Answer
C. Return air temperature
70
What will happen when the thermostat cut down a split AC?
Answer
C. The compressor and condenser fan will stop
71
The cooling capacity of 1 Ton Air conditioner is?
Answer
D. All of these
72
What is the minimum quantity of gas required to be in R 407C charging cylinder while gas charging AC?
Answer
A. 20%
73
The air ducts can be balanced by?
Answer
A. Dampers
74
The device covert incoming alternating current to direct current in inverter AC?
Answer
B. VFD
75
What is the reason for excess cooling on ice cubes in an ice candy plant?
Answer
B. Thermostat not working
76
Which instrument is used to check the speciļ¬c gravity of brine solution in ice plant?
Answer
B. Hydrometer
77
Why ammonia is used as a common refrigerant in an ice plant?
Answer
D. High latent heat value
78
Which expansion device is used in walk in coolers?
Answer
A. Thermostatic expansion valve
79
What is the reason for stop the compressor motor due to LP cut out switch in cold storage plant?
Answer
D. Low evaporator pressure
80
Which process will be done during hot gas defrosting?
Answer
C. Solenoid valve will close
81
In air blast freezing of food, the velocity of air varies from
Answer
A. 30 to 120 m/min
82
During sensible cooling of air in an air conditioning process, the speciļ¬c humidity will be
Answer
B. Remains constant
83
The wet bulb depression indicates ________ humidity of the air?
Answer
D. Relative
84
During adiabatic saturation process on unsaturated air ____________ remains constant?
Answer
A. Wet bulb temperature
85
The wet-bulb depression is zero when relative humidity is
Answer
D. 100%
86
What is the advantage in central AC plant?
Answer
B. The air supply is centralised
87
The aspect ratio, for rectangular ducts, should not be greater than __________ in any case
Answer
C. 8
88
Which sensors measure the moisture level using humidity?
Answer
B. Capacitive sensor
89
In package Air conditioner HP cut out is controlled by
Answer
A. High pressure of discharge
90
What is the eļ¬ect on adjusting the thermostat diļ¬erential too close in package A/C?
Answer
D. Unit starts and stops frequently
91
The location of thermostat sensing bulb in split package unit is
Answer
D. Before the air ļ¬lter
92
A mixing box is an example of which kind of damper
Answer
A. A modulating damper
93
Air dampers used for HVAC service are
Answer
D. Opposed blade, parallel blade, and single blade types
94
Duct are usually of _____________ cross-section
Answer
B. Rectangular
95
Which of the ļ¬lter is having lowest contamination?
Answer
C. Both 1 and 2
96
The ļ¬bers media of HEPA ļ¬lters usually have a diameter between
Answer
A. 0.5 and 2.0 micrometers
97
Air ļ¬lter in an A/C is used for cleaning of
Answer
D. Return air
98
In auto mobile A/C operates on __________ principles?
Answer
C. Electro magnetism
99
Where the location of pressure operated hot gas BPV?
Answer
C. Between compressor discharge and suction line
100
How you can ļ¬nd gas leak by visual inspection in Bus A/C?
Answer
A. Oil trace by the union and connections
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