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Which of the following is the transformer configuration can be used as distribution transformer?*
Star-Delta
Star-Star
Delta-Star
Delta-Delta
Most efficient electrical device is __*
Generator
Motor
Transformer
All are equal efficient
What is correct colour code for 47 ohm resistor? (Format: Colour, Colour, Multiplier colour, Tolerance)*
Yellow, Violet, Black, Black
Yellow, Green, Black, Brown
Yellow, Violet, Black, Red
Yellow, Violet, Black, Brown
What is the ohmic resistance between Gate terminal and Emitter terminal in case of IGBT?*
Greater than 10 Kilo-Ohm
Greater than 500 Kilo-Ohm
Approximately Open(Very High Resistance)
Approximately Close(Very Low Resistance)
The illumination fixture which consumes lowest energy is*
Incandescent lamp
CFL
LED
Fluorescent Tube Light
Calculation formula to find 3-phase power :*
Power= Line Voltage*Line Current *Power Factor
Power= 1.732* Line VoltageLine CurrentPower Factor
Power= 1.732Phase VoltagePhase Current*Power Factor
Power= 3 * Line Voltage * Line Current * Power Factor 7
The power transmission is transmitted at*
Low Voltage ,Low Current
Low Voltage ,High Current
High Voltage, High Current
High Voltage, Low Current
What is Industry 4.0 also called?*
The Data Acquisition Revolution
The Semantic Web Revolution
The Smart Factory Revolution
The Information Revolution
Which optocoupler has less current range?*
Diode
Traic
Transistor
Thyristor
Why (4-20) mA is is considered over (0-10) V signal?*
Voltage Signal has tendency to be weaken over long distance due to resistance
Voltage signal has distortion property
As mA (mili ampere) current range is safe to use
None of the above
The electrical energy generated at power plant is standard of*
33 kV,60 Hz
33 kV, 50 Hz
11 kV, 50 Hz
11 kV,60 Hz
Purpose of making Earth Pit is to get*
High resistance
Low resistance
Resistance as per system requirement
None of the above
Minimum number of earth terminals required for 1-phase system & 3-phase system are*
1 no. for both 1-phase as well as 3 phase system
1 no. for 1-phase & 2 nos. for 3-phase
1 no. for 1-phase & 3 nos. for 3-phase
Any of the above
Which device is used to improve power factor of electrical system?*
Reactor
Capacitor Bank
Resistance
Filter circuit
What is the use of rectifier & inverter circuit?*
Both Rectifier & Inverter: To convert AC to DC
Rectifier: DC to AC , Inverter : AC to DC
Both Rectifier & Inverter : DC to AC
Rectifier: AC to DC , Inverter : DC to AC