Electrical instrument interview questions and answers in 2024
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| Electrical instrument interview questions and answers |
can you define what is basic classifications of electrical instruments are?
Two major types of electrical instruments are described below
- Absolute Instruments
- Secondary instruments
What is an Absolute instrument?
The absolute instruments are those instruments that are not needed for calibration or which give the value of the electrical quantity in terms of the constants of the instrument and of its deflection.
What is a secondary instrument?
The secondary instrument is those instruments that need to be calibration with the help of a standard meter or those instruments which show the unknown quantity directly with the help of a pointer.
Can you define the 4 major properties of an Absolute instrument?
- The reading of the absolute instrument is 100% correct.
- This type of instrument does not need to be compared to another instrument.
- absolute instrument does not show direct measure value.
- An absolute instrument is used to measure the absolute quantity.
Can you define the 4 major properties of a Secondary instrument?
- The reading of the secondary instruments is less accurate.
- Secondary instruments need to be compared to standard meters.
- Secondary instruments show direct measure value.
- This is used in the ordinary measurement.
What are the classifications of instrument w.r.t screen show values?
Four types of instruments are
- Indicating Instrument
- Integrating Instrument
- Recording Instrument
- Displaying Instrument
What type of instrument does W.r.t mounting position?
Two types of instruments are
- Switchboard instrument
- portable instrument
What is indicating instrument?
That instrument shows its measure value with the help of a pointer and a calibrated scale is called an indicating instrument.
What are the main 4 parts of indicating instrument?
There are four parts described below
- Moving system
- Pointer
- Scale
- Control spring
What is a Recording instrument?
Recording instruments are those instruments that show the measured value with the help of pen and graph paper.
Can you tell me the four names of the recording instruments?
The Recording instruments consist of
- Moving system
- Graph paper
- Pen or scratching tool
- Graph papers driving mechanism
Can you define what integrating instruments are and give me one example of integrating instruments?
Integrating instruments are those instruments that integrate the measured value w.r.t time. A major example of integrating instruments is the energy meter in our homes to measure the energy in kWh.
Can you tell me The four major parts of integrating instruments?
The major parts of integrating instruments are described below
- Driving system
- Registering mechanism
- Disc
- braking magnet
What is Displaying an instrument and give one example of displaying an instrument?
Display instruments show their measured value in the form of a screen. A major example of displaying an instrument is an oscilloscope.
What are analogue instruments?
The analogue instruments are those instruments that show measured value and continuously change their value. the analogue instrument consists of a scale and pointer.
What are Digital instruments?
Digital instruments are those instruments that show their measured value in the form of digits. digital instruments consist of logic circuits.
can you give me deflecting torque effects examples in the electrical instruments?
Four effects are used to produce the deflecting torque in the electrical instruments
- Magnetic effect
- Thermal effect
- Chemical effect
- Electrostatic effect
- Electromagnetic effect
Give me the name of the instrument that used a chemical effect.
The DC ampere-hour meter is used as a chemical effect.
Which principle or effect is used in the single-phase energy meter?
The single-phase energy meter used the induction principle or effect.
which forces are used In indicating instruments?
Three forces act in the indicating instruments that are
- Deflecting Force
- Controlling force
- Damping force
What is Deflecting force?
Deflecting forces are used to create the angular displacement in moving parts of indicating instruments is called deflecting force.
Give me the name of two instruments that used a Heating effect?
The two instruments are described below
- Thermocouple instruments
- bi-metal instrument
how do create damping forces in the electrical instruments?
There are three ways to create a damping force are
- Fluid friction damping
- Air friction damping
- Eddy current damping
What are two types of controlling force?
The two types of controlling forces are
- Spring control method
- Gravity control method
What is tangent galvanometer?
A tangent galvanometer is a type of absolute instrument that can measure the flowing current in the circuit 100% accurately.
write the four parts of the tangent galvanometer?
The four parts are
- Magnetic needle and pointer
- horizontal scale
- connection terminals
- adjustable legs
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