Measurement Important Questions

1➤ A 3-phase, 4-wire system supplies power to a balanced star-connected load. The current in each phase is 15 A. The current in the neutral wire will be:

0 A8.66 A 45 A 15 A

2➤ Creep error may occur in induction type energy meter due to:

Incorrect adjustment of position of shading bandIncrease in temperatureOvervoltage across voltage coil Incorrect position of brake magnet

3➤ Induction type energy meter measures energy in

KWhJoulesKWKWs

4➤ The sweep generator of a CRO is used to produce. .

Sinusoidal voltage for the horizontal deflection of electron beamSaw tooth voltage for the horizontal deflection of electron beamSaw tooth voltage for the vertical deflection of electron beam Sinusoidal voltage for the vertical deflection of electron beam

5➤ Synchroscope is used to check ____

Phase angle differencePhase sequenceFrequency differenceRMS voltage

6➤ The sensitivity of a cathode ray oscilloscope is:

Directly proportional to gain of horizontal amplifierInversely proportional to gain of vertical amplifierInversely proportional to gain of horizontal amplifierDirectly proportional to gain of vertical amplifier

7➤ In a Kelvin's double bridge, two set of readings are taken when measuring a low resistance, one with the current in one direction and the other with direction of current reversed. This is done to:

Eliminate the effect of thermo-electric effectsCorrect for changes in battery voltageEliminate the effect of resistance of leadsEliminate the effect of contact resistance

8➤ In a CRO; when set for internal trigger (INT).

Trigger circuit will input horizontal amplifierTrigger circuit receives input from the vertical amplifierTrigger circuit will input vertical amplifier Trigger circuit receives input from the horizontal amplifier

9➤ In Weston frequency meter, the magnetic fields due to both the coils are:

Parallel to each otherAt 45° to each otherAt right angles to each otherAt 30° to each other

10➤ Parallax error is:

Systematic errorEnvironmental errorRandom errorObservational error

11➤ To prevent transformer fault and accidents, under normal operating conditions, secondary winding is kept nearly short circuited in .

Distribution transformerPower transformerCurrent transformer Potential transformer

12➤ While measuring liquid level with fibre optic transducers, the fibre rod or cable is cut in the form of a:

PrismSphereTriangleRectangle

13➤ Piezometer is used to measure.

Very high pressureVery low pressure Pressure difference between two pointsPressure in pipes and channel

14➤ Hot wire ammeters are used for measuring.

Both a.c. and d.c.Neither a.c. nor d.c. Only a.c. Only d.c.

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