Measuring Instruments
Electrician Trade Theory, Module-11
Measuring Instruments
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Q1: Which force is required to move the pointer from zero position in an indicating instrument?
- Controlling force
- Deflecting force
- Air friction damping
- Eddy current damping
Q2: Which is the position to use the instrument provided with gravity control?
- Any position
- Vertical position
- Inclined position
- Horizontal position
Q3: What is the name of the scale?
- Linear scale
- Coarse scale
- Extended scale
- Non-linear scale
Q4: Which error is caused by the incorrect position of instrument reading?
- Device error
- Human error
- Influence error
- Switching error
Q5: Which instrument is used to measure one ohm and below one ohm resistance value accurately?
- Megohm meter
- Multimeter (analog)
- Shunt type ohm meter
- Series type ohm meter
Q6: What is the purpose of the 3rd terminal provided in a advanced megohm meter?
- Get higher ohmic values
- Pass the excess voltage to ground
- Pass the excess current to ground
- Get accurate readings without oscillation
Q7: What is the name of the shunt resistance material?
- Copper
- Eureka
- Nichrome
- Manganin
Q8: What is the reason for the moving coil meter having uniform scale?
- Deflecting torque is directly proportional to the current.
- Deflecting torque is inversely proportional to the current
- Deflecting torque is inversely proportional to the square of the current
- Deflecting torque is directly proportional to the square of the current
Q9: Which error if the energy meter disc rotating continuously on no load?
- Speed error
- Phase error
- Friction error
- Creeping error
Q10: What is the effect on CT if its secondary is kept open?
- CT primary burns out
- Volt ampere capacity reduces
- Volt ampere capacity increases
- CT secondary winding burns out
Q11: What is the purpose of variable resistor connected across shunt type ohm meter?
- Avoid draining of battery
- Minimize the error in reading
- Adjust the current to safe value
- Adjust the pointer to zero adjustment
Q12: Which material is used to make control spring in measuring instruments?
- Steel
- Silver
- Tinned copper
- Phosphor bronze
Q13: Which electrical effect that the single phase energy meter works?
- Heating effect
- Induction effect
- Chemical effect
- Electrostatic effect
Q14: Which is the position to use the instrument. provided with spring control?
- Any position
- Vertical position only
- Inclined position only
- Horizontal position only
Q15: What is the name of meter?
- AC multirange ammeter
- DC multirange voltmeter
- AC and DC multirange ammeter
- AC and DC multirange voltmeter
Q16: Which instrument is an example of an integrating instrument?
- AC voltmeter
- DC voltmeter
- Energy meter
- Tangent galvanometer
Q17: How the creeping error is controlled in energy meter?
- By reducing rated voltage
- By increasing the inductive load
- By adjusting the brake magnet position
- By drilling two holes diametrically opposite on disc
Q18: Why the scale of the moving iron instrument is having un-uniform scale?
- Deflecting force is directly proportional to the Current
- Deflecting force is inversely proportional to the Current
- Deflection force is directly proportional to the square of the Current
- Deflection of force is inversely proportional to the square of the Current
Q19: Which source of measuring error is caused by the effect of magnetic fields?
- Device error
- Human error
- Influence error
- Switching error
Q20: Which type of wattmeter?
- Three element 4 wire wattmeter
- Two element 3 phase wattmeter
- Three element 3 phase wattmeter
- Three phase two element with C.T& P.T
Q21: Which type of instrument is used with air friction damping?
- Moving coil instrument
- Moving iron instrument
- Induction type instrument
- Dynamo meter type instrument
Q22: Which type of energy meter works with neutral connection?
- Three phase two element
- Three phase three element
- Single phase single element
- Three phase two element with CT & PT
Q23: What is the type of frequency meter?
- Weston type
- Ratio meter type
- Electro dynamic type
- Mechanical resonance type
Q24: What is the unit of sensitivity in instruments?
- Volt/ohm
- Ohm/volt
- Ohm metre
- Ohm/metre
Q25: Why two straight holes are provided in the aluminium disc in energy meter?
- To reduce the disc weight
- For power factor correction
- To prevent the flux leakage
- To arrest the creeping error
Q26: What is the name of the instrument?
- Absolute instrument
- Indicating instrument
- Recording instrument
- Integrating instrument
Q27: Why damping force is required in a moving coil instrument?
- Makes the needle movement faster.
- Helps the deflecting force to act fast
- Brings the needle to its zero position
- Arrests the needle without oscillations
Q28: What is the function of soft iron core in a moving coil instrument?
- Strengthens the deflection force
- Controls the needle's movement
- Provides meter with maximum sensitivity
- Provide uniform distribution of magnetic flux in air gap
Q29: Which parameter is the cause for loading effect on measuring instruments?
- Low accuracy
- High sensitivity
- Low sensitivity
- Low influence error
Q30: Name the type of instrument.
- Attraction type moving iron
- Repulsion type moving iron
- Permanent magnet moving coil
- Dynamo meter type moving coil
Q31: Which meter is used to measure revolution per minute of a motor?
- Tachometer
- Energy meter
- Ampere hour meter
- Centre zero ammeter
Q32: How to identify the moving iron type instrument?
- No terminal marking
- Terminal marked (+) only
- One terminal coloured red
- Terminal marked (+) and (-)
Q33: Which is an absolute instrument?
- Ammeter
- Voit meter
- Energy meter
- Tangent galvanometer
Q34: What is the function of integrating instrument?
- Displays the quantity
- Indicates the quantity
- Registers the quantity
- Measures the quantity
Q35: Which quantity is measured by an electrodynamo type instrument?
- Power
- Current
- Voltage
- Resistance
Q36: How to achieve maximum accuracy in measurement using analog instrument?
- Keep low input impedance
- Keep high input impedance
- Use short connecting leads
- Provide correct damping system
Q37: Calculate the value of shunt resistance required to measure 10 mA with one mA meter.
- 3 Ω
- 30 Ω
- 0.3 Ω
- 300 Ω
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