Electrical and Electronics Measurement Mcq Pdf

81. The emf of a saturated Weston cell drops by increase in temperature at a rate

(a) 40 mV/°C
(b) 4 mV/°C
(c) 40 µV/°C
(d) 4 µV/°C

82. The internal resistance of a standard Weston cell is of the order of

(a) a few ohms.
(b) a few hundred ohms.
(c) a few thousand of ohms.
(d) a fraction of an ohm.

83. The materials to be used in the manufacture of a standard resistance should be of

(a) high resistivity and low temperature coefficient.
(b) low resistivity.
(c) high temperature coefficient.
(d) low resistivity and high temperature coefficient.

84. In resistors two wires side by side in opposite directions are wound in order to

(a) give high mechanical strength.
(b) make it more stable.
(c) reduce the coil inductance.
(d) increase the resistance.

85. Which one of the following techniques reduces the residual inductance of standard resistance ?

(a) Using high resistivity material.
(b) Using material of low temperature coefficient of resistance.
(c) Using proper shielding.
(d) Making a bifilar winding on a card.

86. Wire-wound resistors are unsuitable for use at high frequencies because

(a) they are likely to melt under excessive eddy current.
(b) they exhibit unwanted inductive and capacitive effects.
(c) they create more electrical noise.
(d) they consume more power.

87. If R, L and C are the parameters of a resistor, what is the condition for the resistor to be non-inductive ?

(a) L = CR
(b) L = CR²
(c) C = LR²
(d) C = R/L

88. The resistance element having least resistance temperature coefficient is

(a) nickel.
(b) platinum.
(c) manganese.
(d) alumel.

89. Which one of the following passive components has the most precise and accurate standard ?

(a) Resistance.
(b) Inductance.
(c) Capacitance.
(d) Conductance.

 

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