Ammeters And Voltmeters Theory - 5 - MCQs with answers

Ammeters And Voltmeters Theory - 5 - MCQs with answers

Q1. Power consumption in permanent magnet moving coil instrument and hot-wire instruments are

A. Low, low
B. Low, high
C. High, low
D. High, high

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Q2. In the given frequency range, which type of instrument will have highest accuracy

A. electrodynamometer
B. hot-wire instrument
C. electrostatic instrument
D. PMMC

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Q3. Megger is a portable instrument. It is used for the measurement of

A. Low inductance
B. Low resistance
C. High inductance
D. High resistance

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Q4. In a portable instrument, the effect of stray magnetic field on actuating torque will be maximum when the operating field and stray fields are

A. Parallel to each other
B. Perpendicular to each other
C. Inclined at 45 degree
D. Opposite to each other

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Q5. The thermocouple instruments works on the principle of Seebeck effect. The amount of heat produced is

A. Directly proportional to the current
B. Directly proportional to the square of current
C. Inversely proportional to the current
D. Inversely proportional to the square of current

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Q6. The thermocouple ammeter scale is

A. Linear
B. Cramped at low end and open at high end
C. Open at low end and cramped at high end
D. Cramped at the middle

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Q7. The heater wire of thermocouple instruments are made of smaller area of cross section to

A. reduce the skin effect
B. reduce temperature error
C. reduce frequency error
D. increase inductance

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Q8. Induction type instruments are generally used as

A. Ammeter
B. Voltmeter
C. Wattmeter
D. All of these

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Q9. A cylindrical type with split phase winding induction ammeters employs

A. A rotating disc
B. A hollow aluminium drum
C. A single flux producing winding
D. Both (a) and (b)

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Q10. In induction voltmeter, split phase windings are obtained by connecting a

A. High resistances in series with windings of both the magnets

B. High resistance in series with the winding of one magnet and an inductive coil in series with the windings of other magnet

C. An inductive coil in series with the winding of one magnet and a capacitance in series with the windings of other magnet

D. Inductive coils in series with the winding of both the magnets

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