Multiple Choice Question (MCQ) of Measurements page-9

81. The flux density of 2000 gauss equals

a) 2,000 lines per cm²
b) 2,000 lines per cm²
c) 2,000 kilolines per cm^{²

d) 400,000 lines per cm²

Ans: (b)}

82. In ohm’s law for magnetic circuit

a) M.m.f. corresponds to current
b) Gilbert corresponds to volt
c) Reluctance corresponds to ampere
d) Gauss corresponds to ohm

Ans: (b)

83. In the given circuit how much the voltmeter will read ?

a) 0 volt
b) 10 volts
c) 4 volts
d) 5 volts
e) 3.33 volts

Ans: (e)

84. A voltage source and a voltmeter have

a) Zero and ideally infinity zero input impedance respectively
b) Ideally infinite and zero input impedances respectively
c) High and low input impedances respectively
d) None of the above

Ans: (a)

85. The r.m.s. value of the following half wave with its maximum, I_max is

a) I_max/2
b) I_max/√2
c) I_max
d) I_max/√3

Ans: (a)

86. Which of the following instrument will be used to measure a very high frequency but small current ?

a) Electrodynamic ammeter
b) Moving coil galvanometer
c) Thermocouple type instrument
d) Induction type instrument

Ans: (c)

87. If n identical cell of e.m.f. E and internal resistance r are connected in series, they produce a current though an external resistance R equal to

a) nE/R + r
b) nE/R
c) nE/r + n.r
d) E/R + r

Ans: (c)

88. The hysteresis and eddy current are used for

a) Dielectric heating
b) Induction heating
c) Wood heating
d) None of the above

Ans: (b)

89.A dielectric between the plates of a capacitor

a) Decreases the capacitance
b) Increases the capacitance
c) Provides the strength to the capacitor plates
d) None of the above

Ans: (b)

90. A rectifier type a.c. voltmeter

a) Generally uses the iron-vane type of a.c. movement
b) Has a linear scale because it uses a.d.c. meter movement
c) Has a none-linear scale crowded at the left because it uses the dynamometer type of meter movement
d) Needs a thermocouple for low frequencies

Ans: (b)

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Multiple Choice Question (MCQ) of Measurements page-9

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