MEASURING INSTRUMENTS

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

Which is the position to use the instrument provided with gravity control? Any position Vertical position Inclined position Horizontal position

What is the name of the scale?

Linear scale Coarse scale Extended scale Non-linear scale

Which error is caused by the incorrect position of instrument reading? Device error Human error Influence error Switching error

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

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

What is the name of the shunt resistance material? Zinc Eureka Nichrome Manganin

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

Which error if the energy meter disc rotating continuously on no load? Speed error Phase error Friction error Creeping error

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

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

Which material is used to make control spring in measuring instruments? Steel Silver Tinned copper Phosphor bronze

Which electrical effect that the single phase energy meter works? Heating effect Induction effect Chemical effect Electrostatic effect

Which position an instrument using fluid friction damping reads accurately? Any position Vertical position only Inclined position only Horizontal position only

What is the name of meter?

AC multirange ammeter DC multirange voltmeter AC and DC multirange ammeter AC and DC multirange voltmeter

Which instrument is an example of an integrating instrument? AC Voltmeter DC Voltmeter Energy meter Tangent galvanometer

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

Why the scale of the moving iron instrument is having non-uniform scale? Deflecting force is directly proportional to the Current Deflecting force is inversely proportional to the Current Deflection of force is directly proportional to the square of the current Deflection force is inversely proportional to the square of the current

Which source of measuring error is caused by the effect of magnetic fields? Device error Human error Influence error Switching error

Which type of instrument is used with air friction damping? Moving coil instrument Moving iron instrument Induction type instrument Dynamo meter type instrument

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

What is the type of frequency meter?

Weston type Ratio meter type Electro dynamic type Mechanical resonance type

What is the unit of sensitivity in instruments? Volt/ohm Ohm/volt Ohm metre Ohm/metre

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

What is the name of the instrument?

Absolute instrument Indicating instrument Recording instrument Integrating instrument

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

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

Which parameter is the cause for loading effect on measuring instruments? Low accuracy High sensitivity Low sensitivity Low influence error

Which meter is used to measure revolution per minute of a motor? Tachometer Energy meter Ampere hour meter Centre zero ammeter

How to identify the moving iron type instrument? No terminal marking Terminal marked (+) only One terminal coloured red Terminal marked (+) and (-)

Which is an absolute instrument? Ammeter Volt meter Energy meter Tangent galvanometer

Which force produces movement of pointer in an indicating instrument? Damping force Deflecting force Repulsion force Controlling force

What is the function of integrating instrument? Displays the quantity Indicates the quantity Registers the quantity Measures the quantity

Which position an instrument using gravity control reads accurately? Any position Vertical position Inclined position Horizontal position

Which quantity is measured by an electro-dynamo type instrument? Power Current Voltage Resistance

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