1 : Which principle the transformer works?
A : Self-induction
B : Mutual induction
C : Fall of potential
D : Lenzs law
2 : Which is the color of fresh silica gel?
A : Green
B : Blue
C : Grey
D : Yellow
3 : Which part act as a protective device in the transformer?
A : Conservator tank
B : Tap changer
C : Temperature gauge
D : Buchholz relay
4 : Which part reduces the heat of the transformer core and winding?
A : Transformer oil
B : Breather
C : Cooling tubes
D : Conservator tank
5 : What is the name of transformer?
A : Audio frequency transformer
B : High frequency transformer
C : Poly phase transformer
D : Current transformer
6 : Which transformer, the secondary voltage is same as that of primary voltage?
A : Ignition transformer
B : Pulse transformer
C : Isolation transformer
D : Instrument transformer
7 : What is the name of transformer?
A : Ring type transformer
B : Core type transformer
C : Current transformer
D : Air core transformer
8 : What is the emf equation of transformer?
A :
B :
C :
D :
9 : Which is denoted by the letter qm in the formula 4.44 FNqm ?
A : Maximum flux
B : No of turns in primary
C : No of turns in secondary
D : Frequency
10 : What is the name of transformer if the transformation ratio (K) is more than 1?
A : Step down transformer
B : Unity ratio transformer
C : Step up transformer
D : Auto transformer
11 : Which is the transformation ratio?
A :
B :
C :
D :
12 : What is the name of transformer part?
A : ON load tap changer
B : H.V. Bushing termination
C : Manual tap changer
D : L.V. Bushing termination
13 : Which factor the copper loss of a transformer depends?
A : Current
B : Voltage
C : Square of current
D : Square of voltage
14 : Which is having high efficiency?
A : Transformer
B : Alternator
C : AC motor
D : DC motor
15 : Which formula is used to calculate the efficiency of transformer?
A :
B :
C :
D :
16 : Which is the formula for percentage voltage regulation?
A :
B :
C :
D :
17 : Which material is used for transformer bushings?
A : PVC
B : Porcelain
C : Plastic
D : Baklite
18 : Which principle auto transformer works?
A : Lenzs law
B : Flemings right hand rule
C : Self induction
D : Mutual induction
19 : What is the name of test of single phase transformer?
A : Short circuit test
B : Open circuit test
C : Polarity test
D : Continuity test
20 : What is the connection name of transformer?
A : Star – star
B : Star -delta
C : Delta – delta
D : Delta – star
21 : Which is the name of connection?
A : Star – delta
B : Delta – delta
C : Scott connection
D : Star – star
22 : Which test of transformer oil is illustrated?
A : Field test of insulating oil
B : Dielectric test
C : Crackle test
D : Acidity test
23 : Where synthetic liquid transformer oil is used?
A : Generating station transformers
B : Primary substation transformers
C : Refineries and hazardous location
D : Secondary substation transformers
24 : Which part produces magnetic flux in a transformer?
A : Primary winding
B : Secondary winding
C : Tap charger
D : Core
25 : Which is the function of breather in transformer?
A : Observes heat
B : Indicate oil level
C : Prevents the moisture entry
D : Reduces tank pressure
26 : Why the transformer core is laminated?
A : To minimize the hysteresis losses
B : To minimize the eddy current loss
C : To minimize the copper loss
D : To minimize the friction loss
27 : Why shell type core is used for medium and high voltage transformers?
A : To avoid leakage of flux
B : To reduce the tank size
C : For effective cooling
D : To reduce copper loss
28 : Which type of transformer is used in automobiles?
A : Instrument transformer
B : Ignition transtor
C : Scott connected transformer
D : Isolation transformer
29 : Which transformer is classified based on the shape of core?
A : Air core transformer
B : Shell type transformer
C : Audio frequency transformer
D : Instrument transformer
30 : Which is the application of ring type transformer?
A : High frequency measurement
B : High current measurement
C : Low frequency measurement
D : Power distribution
31 : How the capacity of transformers are rated?
A : KW
B : KVA
C : KWH
D : MW
32 : Which part of transformer is used to compensate the voltage drop to consumer receiving from generating station?
A : Iron core
B : Secondary winding
C : Primary winding
D : Tap changer
33 : Which condition the efficiency of a transformer is maximum?
A : Copper is loss is less than iron loss
B : Copper loss = iron loss
C : Copper loss is more than iron loss
D : Copper loss is 1/2 times of iron loss
34 : Which loss is a variable loss?
A : Copper loss
B : Iron loss
C : Friction loss
D : Windage loss
35 : Which loss is determined by conducting short circuit test?
A : Friction loss
B : Windage loss
C : Iron loss
D : Copper loss
36 : Which loss is constant for no load and all load conditions?
A : Windage loss
B : Iron loss
C : Copper loss
D : Friction loss
37 : Which is the purpose of bushings in transformer?
A : To connect primary terminals only
B : To connect both input and output terminas
C : To connect secondary terminals only
D : To connect the neutral terminals
38 : Which type of test is known as DGA test in transformer bushing testing?
A : Measurement of partial discharge
B : Moisture analysis
C : Dielectric gas analysis
D : Dissolved gas analysis
39 : Which is the advantage of auto transformer over two winding transformer?
A : Can isolate the secondary from primary
B : Better voltage regulation
C : Used for power distribution
D : Can be used in EHT supply
40 : Which is the application of auto transformer?
A : Servo line correctors
B : For low voltage distribution
C : To measure the voltage
D : To measure the current
41 : Which is the purpose of parallel operation of transformers?
A : To reduce the voltage drop
B : To increase the output voltage
C : To reduce the no of transformer
D : Provides more reliability of power
42 : Which condition is to be satisfied before connecting two single phase transformer in parallel?
A : Phase sequence must be same
B : Type must be same
C : Polarity must be same
D : Capacity must be same
43 : Which is the application of scott connection?
A : Transform 3 phase to 2 phase
B : To stabilize the output voltage
C : To get rated power output
D : Transform 3 phase to 6 phase
44 : Which type of cooling is employed for distribution transformer upto 100 KVA?
A : Natural air method
B : Oil blast method
C : Air blast method
D : Forced circulation of oil
45 : Which is the purpose of cooling of transformer?
A : To improve the efficiency
B : To protect the winding from damage
C : To regulate the voltage
D : To increase the life of transformer oil
46 : Which method of cooling the fans are used to blow air on the surface of transformer?
A : Forced oil and water cooled
B : Air blast method
C : Oil and water cooled method
D : Oil blast method
47 : Which is the cause for deterioration of transformer oil?
A : Due to over load
B : Insufficient cooling
C : Long time use
D : Due to atmosphere air come into contact with oil
48 : Which is conventional power generation?
A : Thermal
B : Solar
C : Biogas
D : Wind energy
49 : Which fuel is used to generate heat energy in thermal power station?
A : Coal
B : Wood
C : Biogas
D : Kerosene
50 : Which is the name of part marked as x of hydro electric plant?
A : Surge tank
B : Valve house
C : Penstock
D : Reservoir
51 : Which is the name of part marked as x?
A : Nozzle
B : Pelton wheel
C : Operating head
D : Spear
52 : Which is the name of power station?
A : Hydro power station
B : Thermal power station
C : Nuclear power station
D : Diesel power station
53 : What is the name of part that increases the pressure of air supplied to engine to increase power in diesel power plant?
A : Governing system
B : Cooling system
C : Fuel system
D : Super charger
54 : Which device further raises the temperature of steam in thermal power station?
A : Boiler
B : Super heater
C : Economiser
D : Air preheater
55 : What is full form of PWR in nuclear power plants?
A : Pressurized water reactor
B : Pressurized water resource
C : Pressurized water restore
D : Pressurized water receiver
56 : Which material is used to made moderator in nuclear reactor?
A : Graphite
B : Uranium
C : Nickel
D : Copper
57 : How sun heat energy is converted into electrical energy?
A : By solar cells
B : By reflecting the sunlight
C : Thermo couple method
D : By radiation method
58 : Which converts rotor rotation into high speed and rotate the electrical generator in wind power generation?
A : Turbine controller
B : ISU grid
C : Gear box
D : Chopper
59 : Which is the voltage range of secondary distribution?
A : 66KV
B : 33KV
C : 11KV
D : 415V
60 : Which type of transmission is adopted for AC power transmission?
A : Single phase two wire
B : Two phase three wire
C : Three phase three wire
D : Three phase four wire
61 : What is the name of conductor used in over head lines?
A : ACSR
B : Iron
C : Brass
D : Copper
62 : Which is the important property of OH line supports?
A : High mechanical strength
B : Withstand Heavy weight
C : High conductivity
D : Low specific gravity
63 : Which is the span length of steel tower?
A : 40-50 meter
B : 50-80 meter
C : 60-100 meter
D : 100-300 meter
64 : Which height the stay insulators are to be fixed?
A : Not below 1 m from ground
B : Not below 1.5 m from ground
C : Not below 2 m from ground
D : Not below 3 meters from ground
65 : Which is the name of insulator?
A : Suspension insulator
B : Stay insulator
C : Shackle insulator
D : Post insulator
66 : Which is the name of insulator?
A : Pin insulator
B : Stay insulator
C : Shackle insulator
D : Disc insulator
67 : Which is the clearance between live conductors in OH.LT. vertical configuration?
A : 20 cm
B : 30 cm
C : 40 cm
D : 50 cm
68 : What is the purpose of applying grease in binded aluminium joints in OH lines?
A : Avoid sparking
B : Avoid oxidation
C : Avoid loose connection
D : Fill the gap between turns
69 : What is minimum clearance between earth and live conductor in LT vertical configuration?
A : 10 cm
B : 15 cm
C : 25 cm
D : 30 cm
70 : Which is the conductivity of aluminium compared to copper?
A : 30%
B : 40%
C : 50%
D : 60%
71 : Which is the height of bus-bar assembly to be installed from ground?
A : 1 m
B : 1.5 m
C : 2 m
D : 2.75 m
72 : What is the name of material used for bus bar?
A : Brass
B : High speed steel
C : Bronze
D : Aluminium
73 : Which is non conventional power generation?
A : Wind
B : Nuclear
C : Thermal
D : Hydro
74 : Which is the suitable place for construction of hydro power plant?
A : Hill area
B : Seashore
C : Islands
D : Deserts
75 : Which is the main disadvantage of hydro power plant?
A : High capital cost
B : Complicated construction
C : High maintenance cost
D : Requires long starting time
76 : Which is the advantage of diesel power plant over thermal plant?
A : More efficient
B : Less noise
C : Low maintenance cost
D : High unit capacity
77 : Which device heats the feed water on its way to boiler by deriving heat from the flue gases in thermal power plant?
A : Super heater
B : Economiser
C : Air preheater
D : Condenser
78 : Which part convert potential energy into kinetic energy in tidal power plant?
A : Sluices
B : Embankments
C : Turbines
D : Barrage
79 : Which is the disadvantage of AC electric power transmission?
A : Skin effect
B : More voltage fluctuation
C : Required transformer for voltage step up/down
D : More line loss
80 : Which is the advantage of DC electric power transmission?
A : Required only two conductors
B : No communication problem due to high voltae
C : No need of transformer
D : High voltage transmission
81 : Which is the voltage range transmitted to load center in primary transmission?
A : 11KV
B : 33KV
C : 66KV
D : 132KV
82 : Which is the voltage range transmitted in secondary transmission system?
A : 11 KV
B : 11.5 KV
C : 12 KV
D : 66 KV
83 : Which is the property of conducting materials used for OH lines?
A : High tensile strength
B : High specific gravity
C : High dielectric strength
D : Easy available in the market
84 : How many disc of suspension insulators are to be connected in series for a 66KV working voltage?
A : 2
B : 3
C : 4
D : 6
85 : Which insulator is used for terminating corner poles?
A : Pin insulator
B : Shackle insulators
C : Stay insulator
D : Cap and pin type insulator
86 : Which is the size of binding wires used to bind insulator in OH lines?
A : Not less than 1sq.mm
B : Not less than 1.5sq.mm
C : Not less than 2sq .mm
D : Not less than 2.5sq.mm
87 : Which is the minimum clearance between live wires on either side of a support in OH horizontal configuration of conductors?
A : 10 cm
B : 25 cm
C : 30 cm
D : 45 cm
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