Question Paper Electrical Engineering

1. Which one of the following types of instruments does suffer from error due to megnetic hysteresis ?

(1) Induction type

(2) Electrodynamics

(3) Moving Iron

(4) PMMC

Ans (3)

1. A generated voltage is equally dependent on three resistances R 1 , R 2 , R 3 and its value V = (R 1 R 2 )/(R 3 ). If tolerance of each resistor is 0.1%, what will be the maximum error in voltage ?

(1) 0.30%

(2) + 0.3%

(3) 0.10%

(4) + 0.1%

Ans (2)

1. Which one of the following statements correctly response the systematic error ?

(1) These are can be calculated from the details of the instrument.

(2) These are the residual errors.

(3) These error may occur under controlled conditions.

(4) These are the error committed by the experents.

Ans (1)

Swamp resistances and condenesr are used

(1) To reduce the error while measuring DC quantities in a moving iron instrument

(2) To reduce the error while measuring AC quantities in a moving iron instrument

(3) To reduce the error while measuring DC quantities in a moving coil instrument

(4) None of the above

Ans (2)

For accuracy of the instrument which is necessary-

(1) Conformity

(2) Precision

(3) Both

(4) None of the above

Ans (3)

A null type of instrument as compered to a deflecting type instrument has

(1)higher accuracy

(2) lower sensitivity

(3) faster response

(4) All of the above

Ans (1)

The ratio error in current transformer is due to :

(1) Power factor of primary

(2) Wattless component of the current in the primary

(3) Exciting current

(4)Leakage flux

Ans (3)

To minimize the error due to lead and contact resistances, low resistances used in electrical measurement work are provided with

(1)gurad rings

(2) four terminals

(3) thick insulation

(4) metal shields

Ans (2)

1. A 150 V moving iron voltmeter of accuracy class 1.0 reads 75V when used in a circuit under standard conditions. The mssimum possible percentage error in the reading is :

(1) 4.0

(2) 2.0

(3) 1.0

(4) 0.5.

Ans (2)

1. In order to achieve accuracy , how should the slide wire of a potentiometer be ?

(1)As long as possible

(2) As short as possible

(3)Very thin

(4) Very thick

Ans (1)

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