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• AA
• BB
• CC
• DD

A

Explanation:

### 2.An ohmmeter is a

• AMoving iron instrument
• BMoving coil instrument
• CDynamometer instrument
• DNone of the above

Moving coil instrument

Explanation:

### 3.For measuring a very high resistance, we should use

• AKelvin?s double bridge
• BWheat stone bridge
• CMeggar
• DNone of the above

Meggar

Explanation:

For measuring a very high resistance, we should use Megger.

### 4.The electrical power to a megger is provided by

• ABattery
• BPermanent magnet DC generator
• CAC generator
• DAny of the above

Permanent magnet DC generator

Explanation:

The electrical power to a megger is provided by Permanent magnet DC generator.

### 5.In a meggar, controlling torque is provided by

• ASpring
• BGravity
• CCoil
• DEddy current

Coil

Explanation:

In a meggar, controlling torque is provided by coil.

### 6.The operating voltage of a meggar is about

• A6 V
• B12 V
• C40 V
• D100 V

100 V

Explanation:

The operating voltage of a meggar is about 100 V.

### 7.Murray loop test can be used for location of

• AGround fault on a cable
• BShort circuit fault on a cable
• CBoth the ground fault and the short circuit fault
• DNone of the above

Both the ground fault and the short circuit fault

Explanation:

Murray loop test can be used for location of both the ground fault and the short circuit fault

### 8.Which of the following devices should be used for accurate measurement of low DC voltage?

• ASmall range moving coil voltmeter
• BDC potentiometer
• CSmall range thermocouple voltmeter
• DNone of the above

DC potentiometer

Explanation:

### 9.It is required to measure the true open circuit emf of a battery. The best device is

• BAmmeter and a known resistance
• CDC potentiometer
• DNone of the above

DC potentiometer

Explanation:

### 10.A voltage of about 200 V  can be measured

• ADirectly by a DC potentiometer
• BA  DC potentiometer in conjunction with a volt ratio box
• CA  DC potentiometer in conjunction with a known resistance
• DNone of the above

A  DC potentiometer in conjunction with a volt ratio box

Explanation:

### 11.A direct current can be measured by

• AA  DC  potentiometer directly
• BA  DC potentiometer in conjunction with a standard resistance
• CA  DC potentiometer in conjunction with a volt ratio box
• DNone of the above

A  DC potentiometer in conjunction with a standard resistance

Explanation:

A direct current can be measured by a DC potentiometer in conjunction with a standard resistance.

### 12.Potentiometer is used for

• AAccurate measurement of emf of a cell or the potential difference (p.d.) between two points of an electric circuit.
• BMeasurement of electrical resistance in the cell
• CMeasurement of electric current in a cell
• DMeasurement of capacitance of cell.

Accurate measurement of emf of a cell or the potential difference (p.d.) between two points of an electric circuit.

Explanation:

Potentiometer is used for Accurate measurement of emf of a cell or the potential difference (p.d.) between two points of an electric circuit.

### 13.To measure a resistance with the help of a potentiometer it is

• ANecessary to standardise the potentiometer
• BNot necessary to standardise the potentiometer
• CNecessary to use a volt ratio box in conjunction with the potentiometer
• DNone of the above

Not necessary to standardise the potentiometer

Explanation:

To measure a resistance with the help of a potentiometer it is not necessary to standardise the potentiometer.

### 14.A phase shifting transformer is used in conjunction with

• BDrysdale potentiometer
• CAC co-ordinate potentiometer
• DCrompton potentiometer

Drysdale potentiometer

Explanation:

A phase shifting transformer is used in conjunction with Drysdale potentiometer.

### 15.Basically a potentiometer is a device for

• AComparing two voltages
• BMeasuring a current
• CComparing two currents
• DMeasuring a voltage

Comparing two voltages

Explanation:

Basically a potentiometer is a device for Comparing two voltages.

### 16.In order to achieve high accuracy, the slide wire of a potentiometer should be

• AAs long as possible
• BAs short as possible
• CNeither too small not too large
• DVery thick

As long as possible

Explanation:

In order to achieve high accuracy, the slide wire of a potentiometer should be As long as possible.

### 17.The stator of phase shifting transformer for use in conjunction with an AC potentiometer usually has a

• ASingle-phase winding
• BTwo-phase winding
• CThree-phase winding
• DAny of the above

Two-phase winding

Explanation:

### 18.In an Anderson bridge, the unknown inductance is measured in terms of

• AKnown inductance and resistance
• BKnown capacitance and resistance
• CKnown resistance
• DKnown inductance

Known capacitance and resistance

Explanation:

In an Anderson bridge, the unknown inductance is measured in terms of Known capacitance and resistance.

### 19.Wagner earthing device is used to eliminate errors due to

• AElectrostatic coupling
• BElectromagnetic coupling
• CBoth (a) and (b)
• DNone of the above

Electrostatic coupling

Explanation:

Wagner earthing device is used to eliminate errors due to Electrostatic coupling.

### 20.For measurement of mutual inductance, we can use

• AAnderson bridge
• BMaxwell?s bridge
• CHeaviside bridge
• DAny of the above