Special Purpose Measuring Instruments - MCQs with answers

Special Purpose Measuring Instruments - MCQs with answers

Q1. Ballistic galvanometer are principally used for the measurement of

A. Current
B. Voltage
C. Power
D. Electric charges

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Q2. Vibration galvanometer are generally used

A. For measuring electric charges
B. As null-point detectors in ac bridges
C. As null-point detectors in dc bridges
D. For measuring power

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Q3. The meter of a vibrating reed frequency meter depends for its indications on the

A. Electrical resonance of thin flat steel reeds
B. Mechanical resonance of thin flat steel reeds
C. Mechanical resonance of thick flat steel reeds
D. Electrical resonance of thick flat steel reeds

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Q4. The electrodynamic frequency meters have

A. Linear scale and their readings does not depends on voltage

B. Linear scale and their readings depends on voltage

C. Non linear scale and their readings does not depends on voltage

D. Non linear scale and their readings depends on voltage

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Q5. A moving iron frequency meter consists of

A. Two inductive circuits connected in parallel

B. One inductive and one non inductive circuit connected in parallel

C. Two non inductive circuits connected in parallel

D. One inductive and one non inductive circuit connected in series

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Q6. If the frequency of electrodynamic power factor meter is doubled then its reading will become

A. Twice of the original reading
B. Half of the original reading
C. Four times of the original reading
D. Remains unaffected

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Q7. Moving iron power factor meter are suitable for 3 phase balanced circuits. It consists of

A. One control spring
B. Two control spring
C. Three control spring
D. No control spring

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Q8. In Nalder-Lipman moving iron power factor meter, the magnetic field produced

A. Rotates in clockwise direction
B. Rotates in anticlockwise direction
C. Rotates in both clockwise and anticlockwise direction alternately
D. No rotating magnetic field is produced

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Q9. A series reactance coil is used in Weston frequency meter. This coil is used to

A. Suppress harmonics present in the current flowing through the meter
B. Minimizes the waveform errors
C. Both (a) and (b)
D. None of these

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Q10. The coils of rotating type phase sequence indicator are mounted at

A. 60 degree apart in space
B. 90 degree apart in space
C. 120 degree apart in space
D. 180 degree apart in space

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