# Electrical measurements/Electrical Measurement MCQ Question Set 4 Sample Test,Sample questions

## Question: ` A 110V voltmeter can measure a voltage of upto 110kV using a ___`

1.110000/110V P.T.

2. 110000V P.T.

3.110V P.T.

4.110/110000V P.T.

## Question: ` C.T. and P.T. are used for ____`

1.measuring low current and voltages

2.measuring very low current and voltages

3.measuring high currentsand voltages

4.measuring intermediate currents and voltages

## Question: ` Coils of a C.T. are separately wound.`

1. True

2.False

3.all of the above

4.None of the mentioned

## Question: ` How are instrument transformers different from shunts and multipliers?`

1. they are all the same

2.they have transformers

3.readings are independent of component values

4. they can be used for high voltages and currents

## Question: ` How can the meter circuit be isolated from the power circuit?`

1. by grounding

2.through electrical isolation

3. by physical separation

4.through mechanical isolation

1.200

2.199 or 198

3.5

4.1000

## Question: ` In a shell type of core, the windings are ________`

1. in the form of the shell

2.shorted with the primary windings

3.not wound

4.placed on the central limb

## Question: ` In the ring type of core, the secondary winding is ________`

1.non-uniformly distributed over the core

2. shorted with the primary winding

3. uniformly distributed over the core

4.connected in the form of a ring

## Question: ` Instrument transformers can be easily replaced.`

1. True

2. False

3.all of the above

4.None of the mentioned

## Question: ` What is the potential transformer?`

1.transformer used with an D.C. ammeter

2. transformer used with an A.C. voltmeter

3. transformer used with an D.C. ammeter

4.transformer used with an A.C. voltmeter

1.5/1000A C.T.

2.1000A C.T.

3.5A C.T.

4.1000/5A C.T.

1.non-inductive

2.resistive

3.capacitive

4.non-capacitive

## Question: `A shunt can be used to measure large currents.`

1.True

2.False

3.all of the above

4.None of the mentioned

## Question: `A shunt is a ______`

1.very high resistance

2. medium resistance

3. very low resistance

4. high resistance

## Question: `At high voltages, the current transformers are enclosed in a tank.`

1.True

2.False

3.all of the above

4.None of the mentioned

## Question: `C.T. and P.T. are standardized at ____`

1. 50 A and 220 V

2.25 mA and 2.2 kV

3.5 A and 110 V

4.75 nA and 1.1 MV

## Question: `Current terminals have a small current capacity.`

1.True

2.False

3.all of the above

4.None of the mentioned

## Question: `Errors are introduced in Current Transformers.`

1.True

2.False

3.all of the above

4.None of the mentioned

## Question: `Errors in a C.T. can be minimised by _____`

1.making use of laminations

2.having low reactance

3. increasing the secondary winding turns

4.decreasing the primary winding turns

1.n = Np â„ Ns

2.n = 1 â„ Np

3. n = Ns

4.n = Ns â„ Np

1.n = Np â„ Ns

2.n = 1 â„ Np

3.n = Ns

4.n = Ns â„ Np

## Question: `In a C.T., the primary ampere turns is variable.`

1.True

2.False

3.all of the above

4.None of the mentioned

1. impedance

2.capacitance

3. resistance

4. inductance

## Question: `In power measurements 180Â° phase shift is required.`

1. True

2.False

3.all of the above

4.None of the mentioned

## Question: `Instrument transformers give same readings irrespective of number of other instruments connected.`

1. True

2.False

3.all of the above

4.None of the mentioned

## Question: `Instrument transformers provide _____`

1.electrical isolation from low rated winding

2.electrical isolation from high rated winding

3.electrical isolation from medium rated winding

4.no electrical isolation at all

## Question: `Moving coil instruments have a current and voltage rating of _______`

1.100 A and 25 V

2.50 mA and 50 mV

3.75 nA and 100 Î¼V

4. 25 Î¼A and 75 V

## Question: `Mumetal has _______`

1. low permeability, high loss

2.high permeability, medium loss

3.medium permeability, high loss

4.high permeability, low loss

## Question: `Nominal ratio of an instrument transformer is defined as the _______`

1.reciprocal of the rated primary value

2.ratio of rated secondary value to primary value

3.reciprocal of the rated secondary value

4.ratio of rated primary value to secondary value

## Question: `Perminder has ______`

1.medium saturation point of permeability

2.low saturation point of permeability

3.no saturation point of permeability

4.high saturation point of permeability

## Question: `Phase angle error is due to _____`

1.C.T.

2.magnetising component

3.iron loss

4. supply voltage

## Question: `Potential terminals have a ______`

1.high current capacity

2.low voltage capacity

3. low current capacity

4.high voltage capacity

1.current

2.voltage

3.power

4. resistance

## Question: `Ratio correction factor is defined as ____`

1.reciprocal of nominal ratio

2.ratio of nominal ratio to transformation ratio

3.ratio of transformation ratio to nominal ratio

4.reciprocal of transformation ratio

## Question: `Ratio error is defined as ______`

1.Ratio error = Knâ„R

2. Ratio error = Kn â€“ Râ„R

3. Ratio error = Kn â€“ R

4.Ratio error = 1â„R

## Question: `Ratio error is due to ____`

1.iron loss

2. C.T.

3.magnetising component

4.supply voltage

## Question: `Secondary and primary windings consist of ______`

1.copper turns

2.14 S.W.G copper wire and copper strip respectively

3. iron coils wound around

4.laminations

## Question: `The primary winding of a C.T. has ____`

1.a larger number of turns

2.no turns at all

3. intermediate number of turns

4.a few turns

## Question: `The primary winding of a P.T. has _____`

1. intermediate number of turns

2.no turns at all

3.a larger number of turns

4.a few turns

## Question: `The secondary leakage reactance of a C.T. ______`

1. increases its ratio error

2.decreases its ratio error

3.has no effect on its ratio error

4.increases the impedance of the circuit

## Question: `The secondary winding of a C.T. has ______`

1.a large number of turns

2.a few turns

3. no turns at all

4.intermediate number of turns

## Question: `The secondary winding of a P.T. has _______`

1. a large number of turns

2. intermediate number of turns

3. no turns at all

4.a few turns

## Question: `The windings of a C.T. are _______`

1.tied together

2.shorted

3.wound over one another

4.grounded

## Question: `Transformation ratio of an instrument is defined as _______`

1. ratio of primary to secondary phasor

2.ratio of secondary to primary phasor

3.reciprocal of the primary phasor

4.reciprocal of the secondary phasor

## Question: `Turns compensation is used to obtain ____`

1.to compensate the turns

2. to equalise the turns on the windings

3. to protect the equipment

4.transformation ratio equal to nominal ratio

1.n = Np â„ Ns

2.n = Ns â„ Np

3.n = 1 â„ Np

4.n = Ns

## Question: `What is the condition for using a multiplier in A.C. voltmeters?`

1. by using ac supply

2.by maintaining a uniform impedance

3.by maintaining a uniform frequency

4.by using a galvanometer

## Question: `What is the current transformer?`

1. transformer used with an A.C. ammeter

2.transformer used with an D.C. ammeter

3.transformer used with an A.C. voltmeter

4.transformer used with an D.C. voltmeter

## Question: `What is the effect of reducing the secondary turns in a C.T. by 1%?`

1. transformation ratio reduces by the same value

2.no effect

3.nominal ratio increase by the same value

4.secondary current increases by the same value

## Question: `What is the effect of the ammeter range on the shunt resistance?`

1.no effect

2.varies by a factor of multiplying factor

3.varies by a factor of the resistance

4.varies by a factor of unity

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