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1693.

A strain gauge bridge measures the strain in a cantilever where the gauge is fixed. With strain ∈, the gauge resistance increases from 110Ω to 110.520Ω. If the gauge factor is 2.03, then the strain in the cantilever will be
a. 2.06×10⁻³
b. 3.15×10⁻³
c. 3.81×10⁻³
d. 4.33×10⁻³

asked in Electrical Paper-1, 1997

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1694.

A 230 V, 10 A, single-phase energy meter makes 90 revolutions in 3 minutes at half load rated voltage and unity pf. if the meter constant is 1800 revolution, kWh, then its error at half load will be
a. 13.04% slow
b. 13.04% fast
c. 15% slow
d. 15% fast

asked in Electrical Paper-1, 1997

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1695.

Many modem capacitance meters measure capacitance by making the unknown capacity an element in a charge amplifier. A schematic f the same is given below. If the maximum permissible output voltage is limited to 1V_peak’ due to slew rate constraint, then the maximum C_x, with be

a. 10 pF
b. 100 pF
c. 1000 pF
d. 10 nF

asked in Electrical Paper-1, 1997

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1696.

In the case of power measurement by two wattmeter method in a balanced 3-phase system with a pure inductive load,
a. Both the watt meters will indicate the same value but of opposite sign
b. Both the watt meters will indicate zero
c. Both the watt meters will indicate the same value and of the same sign
d. One wattmeter will indicate zero and the other will indicate some non-zero value

asked in Electrical Paper-1, 1997

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1697.

Modem electronic multimeters measure resistance by
a. Using a bridge circuit
b. Using an electronic bridge compensator for nulling
c. Forcing a constant current and measuring the voltage across the unknown resistor
d. Applying a constant voltage and measuring the current through the unknown resistor

asked in Electrical Paper-1, 1997

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1698.

A current transformer has a phase error of + 30.The phase angle between the primary and secondary currents is
a. 30°
b. 177°
c. 180°
d. 183°

asked in Electrical Paper-1, 1997

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