PHYSICS- PAGE 12
1. Compare to 74-series TTL 1C 54-series TTL IC have
(A) More power dissipation (B) More fanout (C) Less fanout (D) Greater tolerance to temperature variation
Ans: D
2. In a moving coil instrument, the deflecting torque is proportional to
(A) Current (B) Square of the current (C) Square root of the current (D) Sine of the measured
Ans: A
3. Which meter is suitable for measurement of 5 mV at 50MHz ?
(A) VTVM (B) Electrostatic voltmeter (C) Moving iron voltmeter (D) C.R.O
Ans: D
4. A galvanometer of resistance 10 W gives full scale deflection of with a current of 2 mA. Which resistance should be connected in parallel so that it measure 2 A on full scale deflection ?
(A) .02 W (B) .2 W
(C) .01 W (D) .1 W
Ans: C
5. An X-Y plotter is ________ instrument.
(A) recording (B) integrating (C) indicating (D) None of these
Ans: A
6. Which diode is used for reverse voltage protection ?
(A) Photo diode (B) Schottky diode (C) PIN diode (D) Avalanche diode
Ans: B
7. Compare to offline UPS online UPS have
(A) Less harmonic distortion and low efficiency
(B) High harmonic distortion and low efficiency
(C) Less harmonic distortion and high efficiency
(D) High harmonic distortion and high efficiency
Ans: A
8. Each cell of static random access cell consist of
(A) 4 MOS transistors and 2 capacitors
(B) 6 MOS transistors
(C) 1 MOS transistor and 1 capacitor
(D) 2 MOS transistors and 2 capacitors
Ans: B
9. An operational amplifier is basically a
(A) Low gain amplifier (B) High gain DC amplifier (C) High gain RC coupled amplifier (D) Low gain transformer coupled amplifier
Ans: B
10. The simplified logic expression for A'B + AB' + AB is
(A) (A+B)' (B) AB (C) A+B (D) A'+B'
Ans: C
11. A compensating capacitor in OP AMP prevents
(A) Voltage gain (B) Oscillations (C) Input offset current (D) Power bandwidth
Ans: B
12. For faster switching action of transistor
(A) The value of coupling capacitor may be increased
(B) A capacitor may be connected across RE
(C) A capacitor may be connected in series with base resistor
(D) A capacitor may be connected across the base resistance
Ans: D
13. In voltage amplifiers load resistance should be
(A) As large as possible (B) As small as possible (C) Equal to output impedance (D) Equal to input impedance
Ans: A
14. What is the clock frequency of a 4 bit ripple counter, if the period of waveform at the last flip flop is 64 microseconds ?
(A) 250 kHz (B) 500 kHz (C) 10 kHz (D) 1 kHz
Ans: A
15. The base transport factor, αT
(A) The current due to electrons injected into the collector, to the current due to electrons injected into the base.
(B) The current due to electrons injected in the emitter, to the current due to electrons injected in the base.
(C) The current due to electrons injected in the base, to the current due to electrons injected in the collector.
(D) The current due to electrons injected in the base, to the current due to electrons injected in emitter.
Ans: A
16. Galvanizing is the process of providing coating of ________ on steel to prevent from rust.
(A) zinc (B) aluminum (C) copper (D) tin
Ans: A
17. The modulus of elasticity of plastic material is ________.
(A) less than unity (B) unity (C) greater than unity (D) zero
Ans: D
18. In a hydroelectric power plant, the storage reservoir fitted to the penstock near to the turbine is ________.
(A) tail race (B) pressure tunnel (C) surge tank (D) dam
Ans: C
19. Which of the following is applicable for any fluid flow ?
(A) Darcy's equation (B) Bernoulli's equation (C) Newton's law of motion (D) Continuity equation
Ans: D
20. The head developed by a centrifugal pump depends on ________.
(A) impeller diameter (B) speed (C) impeller diameter and speed (D) density of fluid
Ans: C
21. ________ is a device which converts one form of energy into another.
(A) Transistor (B) Thyristor
(C) Transformer (D) Transducer
Ans: D
22. Charpy test is conducted to measure ________.
(A) ductility (B) hardness (C) brittleness (D) malleability
Ans: C
23. A work holding device having an integral device for tool guidance is called ________.
(A) clamp (B) fixture (C) attachment (D) jig
Ans: D
24. In ________ welding process exothermal chemical energy is employed for developing high temperature.
(A) thermit (B) plasma (C) gas (D) friction
Ans: A
25. ________ has a safe edge or uncut edge.
(A) Flat file (B) Hand file (C) Square file (D) Triangular file
Ans: B
26. The co-efficient of friction depends upon
(A) strength of surfaces (B) area of contact (C) shape of the surfaces (D) nature of surfaces
Ans: D
27. Galvanizing is the process of providing coating of ________ on steel to prevent from rust.
(A) zinc (B) aluminum (C) copper (D) tin
Ans: A
28. The modulus of elasticity of plastic material is ________.
(A) less than unity (B) unity (C) greater than unity (D) zero
Ans: D
29. In a hydroelectric power plant, the storage reservoir fitted to the penstock near to the turbine is ________.
(A) tail race (B) pressure tunnel (C) surge tank (D) dam
Ans: C
30. Which of the following is applicable for any fluid flow ?
(A) Darcy's equation (B) Bernoulli's equation (C) Newton's law of motion (D) Continuity equation
Ans: D
31. The head developed by a centrifugal pump depends on ________.
(A) impeller diameter (B) speed (C) impeller diameter and speed (D) density of fluid
Ans: C
32. ________ is a device which converts one form of energy into another.
(A) Transistor (B) Thyristor
(C) Transformer (D) Transducer
Ans: D
33:-In summer season the Air Conditioner trips though OLP. What is the reason ?
A:-Condenser may air block and ambient temperature is low
B:-Ambient temperature is low
C:-Condenser air block and high ambient temperature
D:-Over speed of condenser fan
Ans: C
34:-Frost Free Refrigerator defrosting method is
A:-Hot gas defrosting
B:-Manual defrosting
C:-Water spray defrosting
D:-Electric heater defrosting
Ans: D
35:-Water cooled condenser is used in
A:-Split air conditioner
B:-Window air conditioner
C:-Water cooler
D:-Central air conditioning plant
Ans: D
36:-Secondary refrigerant is used in
A:-Milk Chilling Plant
B:-Chilling Plant
C:-Ice Plant
D:-All of these
Ans: D
37:-The R.H. of air required for human comfort is
A:-25%
B:-75%
C:-50%
D:-None of these
Ans: D
38:-On Psychrometric Chart wet bulb temperature lines are
A:-Horizontal
B:-Vertical
C:-Straight inclined sloping downward to the right
D:-Curved
Ans: C
39:-Tachometer is used to measure
A:-Humidity in air
B:-Velocity of air
C:-Density of air
D:-Speed of compressor
Ans: D
40:-−252°F is equal to degree celsius.
A:-−160.7
B:-−167.7
C:-−150.77
D:-−157.77
Ans: D
41:-An air conditioner consumes 5 Amps from 240 Volts and the PF is 0.8 its power is
A:-690 Watts
B:-985 Watts
C:-950 Watts
D:-960 Watts
Ans: D
42:- Compressor has less EER.
A:-Reciprocating Compressor
B:-Rotary Compressor
C:-Centrifugal Compressor
D:-Screw Compressor
Ans: A
43:-An oil separator is installed in-between
A:-Receiver and Expansion Valve
B:-Compressor and Condenser
C:-Condenser and Receiver
D:-Evaporator and Compressor
Ans: B
44:-Piercing valve is used to
A:-Recover the gas
B:-Pinch the charging line
C:-Release the gas out
D:-Recover the oil
Ans: A
45:-Diameter of Capillary tube used in Refrigerator is
A:-0.055 inch
B:-0.0361 inch
C:-0.065 inch
D:-0.0255 inch
Ans: B
46:-Automatic expansion valve controls the flow of Refrigerant to evaporator according to
A:-Pressure
B:-Temperature
C:-Pressure and Temperature
D:-None of these
Ans: A
47:-Dry ice is used for
A:-Cooling water
B:-Cooling milk
C:-Preserving food stuffs
D:-None of these
Ans: C
48:-Substitute of Freon-12 refrigerant is
A:-134 a
B:-Freon-22
C:-Freon-11
D:-None of these
Ans: A
49:-Secondary Refrigerant is useful because
A:-It is cheap
B:-Easily available
C:-It reduces the primary Refrigerant Piping
D:-None of these
Ans: C
50:-In Split air conditioners the following condenser is used
A:-Forced convection air cooled
B:-Natural Convection air cooled
C:-Water cooled
D:-Evaporative type
Ans: A
(A) More power dissipation (B) More fanout (C) Less fanout (D) Greater tolerance to temperature variation
Ans: D
2. In a moving coil instrument, the deflecting torque is proportional to
(A) Current (B) Square of the current (C) Square root of the current (D) Sine of the measured
Ans: A
3. Which meter is suitable for measurement of 5 mV at 50MHz ?
(A) VTVM (B) Electrostatic voltmeter (C) Moving iron voltmeter (D) C.R.O
Ans: D
4. A galvanometer of resistance 10 W gives full scale deflection of with a current of 2 mA. Which resistance should be connected in parallel so that it measure 2 A on full scale deflection ?
(A) .02 W (B) .2 W
(C) .01 W (D) .1 W
Ans: C
5. An X-Y plotter is ________ instrument.
(A) recording (B) integrating (C) indicating (D) None of these
Ans: A
6. Which diode is used for reverse voltage protection ?
(A) Photo diode (B) Schottky diode (C) PIN diode (D) Avalanche diode
Ans: B
7. Compare to offline UPS online UPS have
(A) Less harmonic distortion and low efficiency
(B) High harmonic distortion and low efficiency
(C) Less harmonic distortion and high efficiency
(D) High harmonic distortion and high efficiency
Ans: A
8. Each cell of static random access cell consist of
(A) 4 MOS transistors and 2 capacitors
(B) 6 MOS transistors
(C) 1 MOS transistor and 1 capacitor
(D) 2 MOS transistors and 2 capacitors
Ans: B
9. An operational amplifier is basically a
(A) Low gain amplifier (B) High gain DC amplifier (C) High gain RC coupled amplifier (D) Low gain transformer coupled amplifier
Ans: B
10. The simplified logic expression for A'B + AB' + AB is
(A) (A+B)' (B) AB (C) A+B (D) A'+B'
Ans: C
11. A compensating capacitor in OP AMP prevents
(A) Voltage gain (B) Oscillations (C) Input offset current (D) Power bandwidth
Ans: B
12. For faster switching action of transistor
(A) The value of coupling capacitor may be increased
(B) A capacitor may be connected across RE
(C) A capacitor may be connected in series with base resistor
(D) A capacitor may be connected across the base resistance
Ans: D
13. In voltage amplifiers load resistance should be
(A) As large as possible (B) As small as possible (C) Equal to output impedance (D) Equal to input impedance
Ans: A
14. What is the clock frequency of a 4 bit ripple counter, if the period of waveform at the last flip flop is 64 microseconds ?
(A) 250 kHz (B) 500 kHz (C) 10 kHz (D) 1 kHz
Ans: A
15. The base transport factor, αT
(A) The current due to electrons injected into the collector, to the current due to electrons injected into the base.
(B) The current due to electrons injected in the emitter, to the current due to electrons injected in the base.
(C) The current due to electrons injected in the base, to the current due to electrons injected in the collector.
(D) The current due to electrons injected in the base, to the current due to electrons injected in emitter.
Ans: A
16. Galvanizing is the process of providing coating of ________ on steel to prevent from rust.
(A) zinc (B) aluminum (C) copper (D) tin
Ans: A
17. The modulus of elasticity of plastic material is ________.
(A) less than unity (B) unity (C) greater than unity (D) zero
Ans: D
18. In a hydroelectric power plant, the storage reservoir fitted to the penstock near to the turbine is ________.
(A) tail race (B) pressure tunnel (C) surge tank (D) dam
Ans: C
19. Which of the following is applicable for any fluid flow ?
(A) Darcy's equation (B) Bernoulli's equation (C) Newton's law of motion (D) Continuity equation
Ans: D
20. The head developed by a centrifugal pump depends on ________.
(A) impeller diameter (B) speed (C) impeller diameter and speed (D) density of fluid
Ans: C
21. ________ is a device which converts one form of energy into another.
(A) Transistor (B) Thyristor
(C) Transformer (D) Transducer
Ans: D
22. Charpy test is conducted to measure ________.
(A) ductility (B) hardness (C) brittleness (D) malleability
Ans: C
23. A work holding device having an integral device for tool guidance is called ________.
(A) clamp (B) fixture (C) attachment (D) jig
Ans: D
24. In ________ welding process exothermal chemical energy is employed for developing high temperature.
(A) thermit (B) plasma (C) gas (D) friction
Ans: A
25. ________ has a safe edge or uncut edge.
(A) Flat file (B) Hand file (C) Square file (D) Triangular file
Ans: B
26. The co-efficient of friction depends upon
(A) strength of surfaces (B) area of contact (C) shape of the surfaces (D) nature of surfaces
Ans: D
27. Galvanizing is the process of providing coating of ________ on steel to prevent from rust.
(A) zinc (B) aluminum (C) copper (D) tin
Ans: A
28. The modulus of elasticity of plastic material is ________.
(A) less than unity (B) unity (C) greater than unity (D) zero
Ans: D
29. In a hydroelectric power plant, the storage reservoir fitted to the penstock near to the turbine is ________.
(A) tail race (B) pressure tunnel (C) surge tank (D) dam
Ans: C
30. Which of the following is applicable for any fluid flow ?
(A) Darcy's equation (B) Bernoulli's equation (C) Newton's law of motion (D) Continuity equation
Ans: D
31. The head developed by a centrifugal pump depends on ________.
(A) impeller diameter (B) speed (C) impeller diameter and speed (D) density of fluid
Ans: C
32. ________ is a device which converts one form of energy into another.
(A) Transistor (B) Thyristor
(C) Transformer (D) Transducer
Ans: D
33:-In summer season the Air Conditioner trips though OLP. What is the reason ?
A:-Condenser may air block and ambient temperature is low
B:-Ambient temperature is low
C:-Condenser air block and high ambient temperature
D:-Over speed of condenser fan
Ans: C
34:-Frost Free Refrigerator defrosting method is
A:-Hot gas defrosting
B:-Manual defrosting
C:-Water spray defrosting
D:-Electric heater defrosting
Ans: D
35:-Water cooled condenser is used in
A:-Split air conditioner
B:-Window air conditioner
C:-Water cooler
D:-Central air conditioning plant
Ans: D
36:-Secondary refrigerant is used in
A:-Milk Chilling Plant
B:-Chilling Plant
C:-Ice Plant
D:-All of these
Ans: D
37:-The R.H. of air required for human comfort is
A:-25%
B:-75%
C:-50%
D:-None of these
Ans: D
38:-On Psychrometric Chart wet bulb temperature lines are
A:-Horizontal
B:-Vertical
C:-Straight inclined sloping downward to the right
D:-Curved
Ans: C
39:-Tachometer is used to measure
A:-Humidity in air
B:-Velocity of air
C:-Density of air
D:-Speed of compressor
Ans: D
40:-−252°F is equal to degree celsius.
A:-−160.7
B:-−167.7
C:-−150.77
D:-−157.77
Ans: D
41:-An air conditioner consumes 5 Amps from 240 Volts and the PF is 0.8 its power is
A:-690 Watts
B:-985 Watts
C:-950 Watts
D:-960 Watts
Ans: D
42:- Compressor has less EER.
A:-Reciprocating Compressor
B:-Rotary Compressor
C:-Centrifugal Compressor
D:-Screw Compressor
Ans: A
43:-An oil separator is installed in-between
A:-Receiver and Expansion Valve
B:-Compressor and Condenser
C:-Condenser and Receiver
D:-Evaporator and Compressor
Ans: B
44:-Piercing valve is used to
A:-Recover the gas
B:-Pinch the charging line
C:-Release the gas out
D:-Recover the oil
Ans: A
45:-Diameter of Capillary tube used in Refrigerator is
A:-0.055 inch
B:-0.0361 inch
C:-0.065 inch
D:-0.0255 inch
Ans: B
46:-Automatic expansion valve controls the flow of Refrigerant to evaporator according to
A:-Pressure
B:-Temperature
C:-Pressure and Temperature
D:-None of these
Ans: A
47:-Dry ice is used for
A:-Cooling water
B:-Cooling milk
C:-Preserving food stuffs
D:-None of these
Ans: C
48:-Substitute of Freon-12 refrigerant is
A:-134 a
B:-Freon-22
C:-Freon-11
D:-None of these
Ans: A
49:-Secondary Refrigerant is useful because
A:-It is cheap
B:-Easily available
C:-It reduces the primary Refrigerant Piping
D:-None of these
Ans: C
50:-In Split air conditioners the following condenser is used
A:-Forced convection air cooled
B:-Natural Convection air cooled
C:-Water cooled
D:-Evaporative type
Ans: A
51:-When is the Vacuum Pump used in refrigeration system ?
A:-After gas charging
B:-Before gas charging
C:-Before leak arresting
D:-Before oil charging
Ans: B
52:-For easy bending and Flaring we use
A:-Annealed copper tube
B:-Plastic tube
C:-Brass tube
D:-M. S. tube
Ans: A
53:-The Refrigerant for a Refrigerator should have
A:-High sensible heat
B:-Low latent heat
C:-High latent heat
D:-Low sensible heat
Ans: C
54:-Most of the domestic Refrigerators work on the following Refrigeration system
A:-Vapour Compression System
B:-Vapour Absorption System
C:-Thermo Electric System
D:-Air Compression System
Ans: A
55:-The dry bulb temperature and wet bulb temperature becomes equal at % RH.
A:-100%
B:-90%
C:-50%
D:-None of these
Ans: A
56:-The chemical formula of R. 22 refrigerant is
A:-`C Cl_(2)F_(2)`
B:-`CHClF_(2)`
C:-`C CLF_(2)`
D:-`CHCl_(2)F_(2)`
Ans: B
57:-Halide torch is used for Refrigerants.
A:-Detect Leak of `NH_(3)`
B:-Detect leak of `CO_(2)`
C:-Detect leak of Freon group
D:-None of these
Ans: C
58:-Temperature control device used in Air Conditioner is known as
A:-Thermostatic Expansion Valve
B:-Thermostatic switch
C:-A.E.V.
D:-H.P.C.
Ans: B
59:-Volumetric efficiency of a compressor is expressed in
A:-Percentage
B:-Calorie/Hr.
C:-BTU/Hr.
D:-Psig
Ans: A
60:-Inverter Refrigerator is working under the principle of
A:-Frequency modulating
B:-Voltage modulating
C:-Current modulating
D:-None of these
Ans: A
61:-Inverter Air Conditioner consumes current.
A:-More
B:-Less
C:-Very high
D:-None of these
Ans: B
62:-The term called triple point is
A:-The temperature condition of a substance at solid state
B:-The pressure condition of a substance at liquid state
C:-The pressure/temperature condition is in balance at vapour state
D:-The Pressure/Temperature condition in which a substance is in balance in solid, liquid and vapour state
Ans: D
63:-Bi-metal thermostatis a device used in
A:-Pressure circuit
B:-TEV circuit
C:-Defrosting circuit
D:-Compressor circuit
Ans: C
64:-Many bubbles in the liquid line sight glass are a sign that the system is
A:-Properly charged
B:-Contaminated with air
C:-Under charged
D:-Over charged
Ans: C
65:-The main parts of a Rotary Compressor are
A:-Cylinder and piston
B:-Rotor and crank shaft
C:-Roller and cylinder
D:-All of the above
Ans: C
66:-High side float valve is used in
A:-Dry type evaporator
B:-Non-frosting evaporator
C:-Flooded type evaporator
D:-All of the above
Ans: C
67:-Modification of R-12 to R-134a refrigerant in a refrigeration system is called ____________
A:-Recovery
B:-Retrofit
C:-Refilling
D:-Pump down
Ans: B
68:-Car Air Conditioner is a _____________system.
A:-Vapour absorption
B:-Vapour Compression
C:-Air Compression
D:-None of these
Ans: B
69:-Magnetic Clutch is used in
A:-Split A/C
B:-Window A/C
C:-Car A/C
D:-Package A/C
Ans: C
70:-Chilling plant is called as
A:-Direct A/C Plant
B:-Indirect A/C Plant
C:-Multi split A/C
D:-None of these
Ans: B
71:-Chilled milk temperature in a milk chilling plant is
A:-−5°C to 0°C
B:-10°C to 12°C
C:-2°C to 10°C
D:-None of these
Ans: C
72:-Sling Psychrometer is used to measure
A:-Relative humidity
B:-Dry bulb and wet bulb temperature
C:-Cooling and heating of air supply
D:-None of these
Ans: B
73:-Voltage type relay is used in compressor motor.
A:-CSIR
B:-CSR
C:-RSIR
D:-PSC
Ans: B
74:-For condenser flushing is used.
A:-CTC
B:-Trichloro ethylene
C:-Petrol
D:-All of these
Ans: B
75:-Mechanical Refrigeration system is also called as
A:-Vapour absorption system
B:-Vapour compression system
C:-Liquid vapour system
D:-All of these
Ans: B
76:-Voltage type relay coil is connected to motor starting terminal is in
A:-Series
B:-Parallel
C:-Series and parallel
D:-Series at starting time then parallel
Ans: B
77:-The starting capacitor value of a 1 Ton Split A/C is
A:-40 to 60 mfd
B:-80 to 100 mfd
C:-100 to 120 mfd
D:-None of these
Ans: B
78:- method is used to detect leaks in Refrigeration system.
A:-Observation
B:-Soap Bubble
C:-Water tank dipping
D:-All of these
Ans: D
79:-Fin and tube type evaporator is used in
A:-Window AC
B:-Package AC
C:-Split AC
D:-All of these
Ans: D
80:-Direct Cool Refrigerator is also called as
A:-Conventional type Refrigerator
B:-Frost free Refrigerator
C:-Non-frost Refrigerator
D:-None of these
Ans: A
81:-The safest chemical to use for descaling is
A:-Sulphuric acid
B:-Diluted HCl
C:-Diluted Nitric acid
D:-Bleaching powder
Ans: B
82:-The purpose of air filter in air conditioning system is
A:-To remove dust and dirt from air
B:-To remove dust from refrigerant
C:-To remove humidity from air
D:-To remove air from A/C space
Ans: A
83:-In hot gas by pass method of capacity control of compressor, the hot compressed gas is
A:-By passed back to liquid line
B:-By passed back to suction line
C:-By passed back to evaporator line
D:-By passed back to liquid receiver
Ans: B
84:-The capacity of refrigerator is expressed in
A:-Litre
B:-Tons of Refrigeration
C:-k Cal/TR
D:-None of these
Ans: A
85:-Tap used to avoid water wastage is
A:-Push tap
B:-Ball tap
C:-Lever type tap
D:-Regulating tap
Ans: A
86:-Floor level of water cooler to be checked by
A:-Measuring scale
B:-Viewing perpendicularly
C:-Using spirit level
D:-Using tube level
Ans: C
87:-Dead nut is used in Refrigeration flare fittings
A:-For closing a connection end
B:-For controlling a line
C:-For operating on and off
D:-None of these
Ans: A
88:-The bush bearing of a compressor is lubricated by
A:-Oil
B:-Grease
C:-Refrigerant
D:-Air and water
Ans: A
89:-Cylinder colour code of R134 a is
A:-Orange
B:-Green
C:-White
D:-Orchid
Ans: C
90:-What is the use of Crank case oil heater ?
A:-Heats up the oil when compressor is idle
B:-Heats up the oil when compressor is ON
C:-Heats up the Refrigerant in crank case
D:-None of these
Ans: A
91:-Pressure relief valve is installed on
A:-Compressor head
B:-Liquid receiver
C:-Discharge line of compressor
D:-All of these
Ans: D
92:-H.C. blend contains
A:-40% isobutene and 60% propane
B:-50% isobutane and 50% propane
C:-50% hydrogen and 50% carbon
D:-50% fluorine and 50% oxygen
Ans: B
93:-Fan motor of split Air conditioner of 1 Ton capacity is
A:-PSC
B:-RSIR
C:-CSR
D:-Shade pole
Ans: A
94:-Spray nozzles of cooling tower is used for
A:-Sprays the water from evaporator
B:-Sprinkle the water from condenser
C:-Sprays the water from chiller
D:-All of these
Ans: B
95:-Evaporative condenser is used in
A:-Ice plant
B:-Split air conditioner
C:-Package air conditioner
D:-Window air conditioner
Ans: A
96:-Thermometer is to measure the
A:-Latent heat
B:-Sensible heat
C:-Thermo heat
D:-Specific heat
Ans: B
97:-Duct is used to
A:-Distribute air from AHU to confined space
B:-AHU to out side of A/C room
C:-Return air from confined space to AHU
D:-All of these
Ans: D
98:-Pully Puller is used to remove
A:-Fly wheel and bearings from shaft
B:-Shaft from compressor
C:-Piston from cylinderpully
D:-Rings from piston
Ans: A
99:-Three phase motor is used in
A:-Package A/C
B:-Multy split A/C
C:-Central A/C Plant
D:-All of these
Ans: D
100:-Service valve is used for
A:-Charging gas to system
B:-Pressure testing
C:-Evacuating
D:-All of these
Ans: D
A:-After gas charging
B:-Before gas charging
C:-Before leak arresting
D:-Before oil charging
Ans: B
52:-For easy bending and Flaring we use
A:-Annealed copper tube
B:-Plastic tube
C:-Brass tube
D:-M. S. tube
Ans: A
53:-The Refrigerant for a Refrigerator should have
A:-High sensible heat
B:-Low latent heat
C:-High latent heat
D:-Low sensible heat
Ans: C
54:-Most of the domestic Refrigerators work on the following Refrigeration system
A:-Vapour Compression System
B:-Vapour Absorption System
C:-Thermo Electric System
D:-Air Compression System
Ans: A
55:-The dry bulb temperature and wet bulb temperature becomes equal at % RH.
A:-100%
B:-90%
C:-50%
D:-None of these
Ans: A
56:-The chemical formula of R. 22 refrigerant is
A:-`C Cl_(2)F_(2)`
B:-`CHClF_(2)`
C:-`C CLF_(2)`
D:-`CHCl_(2)F_(2)`
Ans: B
57:-Halide torch is used for Refrigerants.
A:-Detect Leak of `NH_(3)`
B:-Detect leak of `CO_(2)`
C:-Detect leak of Freon group
D:-None of these
Ans: C
58:-Temperature control device used in Air Conditioner is known as
A:-Thermostatic Expansion Valve
B:-Thermostatic switch
C:-A.E.V.
D:-H.P.C.
Ans: B
59:-Volumetric efficiency of a compressor is expressed in
A:-Percentage
B:-Calorie/Hr.
C:-BTU/Hr.
D:-Psig
Ans: A
60:-Inverter Refrigerator is working under the principle of
A:-Frequency modulating
B:-Voltage modulating
C:-Current modulating
D:-None of these
Ans: A
61:-Inverter Air Conditioner consumes current.
A:-More
B:-Less
C:-Very high
D:-None of these
Ans: B
62:-The term called triple point is
A:-The temperature condition of a substance at solid state
B:-The pressure condition of a substance at liquid state
C:-The pressure/temperature condition is in balance at vapour state
D:-The Pressure/Temperature condition in which a substance is in balance in solid, liquid and vapour state
Ans: D
63:-Bi-metal thermostatis a device used in
A:-Pressure circuit
B:-TEV circuit
C:-Defrosting circuit
D:-Compressor circuit
Ans: C
64:-Many bubbles in the liquid line sight glass are a sign that the system is
A:-Properly charged
B:-Contaminated with air
C:-Under charged
D:-Over charged
Ans: C
65:-The main parts of a Rotary Compressor are
A:-Cylinder and piston
B:-Rotor and crank shaft
C:-Roller and cylinder
D:-All of the above
Ans: C
66:-High side float valve is used in
A:-Dry type evaporator
B:-Non-frosting evaporator
C:-Flooded type evaporator
D:-All of the above
Ans: C
67:-Modification of R-12 to R-134a refrigerant in a refrigeration system is called ____________
A:-Recovery
B:-Retrofit
C:-Refilling
D:-Pump down
Ans: B
68:-Car Air Conditioner is a _____________system.
A:-Vapour absorption
B:-Vapour Compression
C:-Air Compression
D:-None of these
Ans: B
69:-Magnetic Clutch is used in
A:-Split A/C
B:-Window A/C
C:-Car A/C
D:-Package A/C
Ans: C
70:-Chilling plant is called as
A:-Direct A/C Plant
B:-Indirect A/C Plant
C:-Multi split A/C
D:-None of these
Ans: B
71:-Chilled milk temperature in a milk chilling plant is
A:-−5°C to 0°C
B:-10°C to 12°C
C:-2°C to 10°C
D:-None of these
Ans: C
72:-Sling Psychrometer is used to measure
A:-Relative humidity
B:-Dry bulb and wet bulb temperature
C:-Cooling and heating of air supply
D:-None of these
Ans: B
73:-Voltage type relay is used in compressor motor.
A:-CSIR
B:-CSR
C:-RSIR
D:-PSC
Ans: B
74:-For condenser flushing is used.
A:-CTC
B:-Trichloro ethylene
C:-Petrol
D:-All of these
Ans: B
75:-Mechanical Refrigeration system is also called as
A:-Vapour absorption system
B:-Vapour compression system
C:-Liquid vapour system
D:-All of these
Ans: B
76:-Voltage type relay coil is connected to motor starting terminal is in
A:-Series
B:-Parallel
C:-Series and parallel
D:-Series at starting time then parallel
Ans: B
77:-The starting capacitor value of a 1 Ton Split A/C is
A:-40 to 60 mfd
B:-80 to 100 mfd
C:-100 to 120 mfd
D:-None of these
Ans: B
78:- method is used to detect leaks in Refrigeration system.
A:-Observation
B:-Soap Bubble
C:-Water tank dipping
D:-All of these
Ans: D
79:-Fin and tube type evaporator is used in
A:-Window AC
B:-Package AC
C:-Split AC
D:-All of these
Ans: D
80:-Direct Cool Refrigerator is also called as
A:-Conventional type Refrigerator
B:-Frost free Refrigerator
C:-Non-frost Refrigerator
D:-None of these
Ans: A
81:-The safest chemical to use for descaling is
A:-Sulphuric acid
B:-Diluted HCl
C:-Diluted Nitric acid
D:-Bleaching powder
Ans: B
82:-The purpose of air filter in air conditioning system is
A:-To remove dust and dirt from air
B:-To remove dust from refrigerant
C:-To remove humidity from air
D:-To remove air from A/C space
Ans: A
83:-In hot gas by pass method of capacity control of compressor, the hot compressed gas is
A:-By passed back to liquid line
B:-By passed back to suction line
C:-By passed back to evaporator line
D:-By passed back to liquid receiver
Ans: B
84:-The capacity of refrigerator is expressed in
A:-Litre
B:-Tons of Refrigeration
C:-k Cal/TR
D:-None of these
Ans: A
85:-Tap used to avoid water wastage is
A:-Push tap
B:-Ball tap
C:-Lever type tap
D:-Regulating tap
Ans: A
86:-Floor level of water cooler to be checked by
A:-Measuring scale
B:-Viewing perpendicularly
C:-Using spirit level
D:-Using tube level
Ans: C
87:-Dead nut is used in Refrigeration flare fittings
A:-For closing a connection end
B:-For controlling a line
C:-For operating on and off
D:-None of these
Ans: A
88:-The bush bearing of a compressor is lubricated by
A:-Oil
B:-Grease
C:-Refrigerant
D:-Air and water
Ans: A
89:-Cylinder colour code of R134 a is
A:-Orange
B:-Green
C:-White
D:-Orchid
Ans: C
90:-What is the use of Crank case oil heater ?
A:-Heats up the oil when compressor is idle
B:-Heats up the oil when compressor is ON
C:-Heats up the Refrigerant in crank case
D:-None of these
Ans: A
91:-Pressure relief valve is installed on
A:-Compressor head
B:-Liquid receiver
C:-Discharge line of compressor
D:-All of these
Ans: D
92:-H.C. blend contains
A:-40% isobutene and 60% propane
B:-50% isobutane and 50% propane
C:-50% hydrogen and 50% carbon
D:-50% fluorine and 50% oxygen
Ans: B
93:-Fan motor of split Air conditioner of 1 Ton capacity is
A:-PSC
B:-RSIR
C:-CSR
D:-Shade pole
Ans: A
94:-Spray nozzles of cooling tower is used for
A:-Sprays the water from evaporator
B:-Sprinkle the water from condenser
C:-Sprays the water from chiller
D:-All of these
Ans: B
95:-Evaporative condenser is used in
A:-Ice plant
B:-Split air conditioner
C:-Package air conditioner
D:-Window air conditioner
Ans: A
96:-Thermometer is to measure the
A:-Latent heat
B:-Sensible heat
C:-Thermo heat
D:-Specific heat
Ans: B
97:-Duct is used to
A:-Distribute air from AHU to confined space
B:-AHU to out side of A/C room
C:-Return air from confined space to AHU
D:-All of these
Ans: D
98:-Pully Puller is used to remove
A:-Fly wheel and bearings from shaft
B:-Shaft from compressor
C:-Piston from cylinderpully
D:-Rings from piston
Ans: A
99:-Three phase motor is used in
A:-Package A/C
B:-Multy split A/C
C:-Central A/C Plant
D:-All of these
Ans: D
100:-Service valve is used for
A:-Charging gas to system
B:-Pressure testing
C:-Evacuating
D:-All of these
Ans: D