1. The primary winding of a current transformer is connected in ______ with the line carrying the main current. Parallel Series Either Series or Parallel None of the above 2. The ratio error in the current transformer is attributed to: Leakage flux Magnetizing component of no-load current Power factor of the primary The energy …
1. Transformation ratio of an instrument is defined as ________ Ratio of primary to secondary phasor Ratio of secondary to primary phasor Reciprocal of the primary phasor Reciprocal of the secondary phasor 2. The 1000/5 A 50 Hz ring cored current converter has a bar primary. The secondary resistor (Burden) is a net resistance of …
1. The burden of the instrument transformer is considered when instruments are ______ Connected internally Connected externally Both 1 and 2 Out of phase 2. The burden value in Potential Transformer (PT) should be ______ to achieve low errors in PT. Low Medium Infinite High 3. The potential transformer is always a ______ …
1. Instrument transformers are designed to transform _____ Current only Voltage Only Both current and voltage Low value of current and voltage 2. If the secondary winding of a current transformer is opened when the primary winding is carrying current, then the following event occurs: The transformer will burn immediately High induced EMF is …
Instrument Transformers MCQ || Instrument Transformers Questions and Answers Read More »
1. The braking torque of induction type single-phase energy meter is: Directly proportional to the square of the flux Directly proportional to the flux Inversely proportional to the flux Inversely proportional to the square of the flux 2. If an energy meter disc makes 10 revolutions in 100 sec when a load of 450 …
Measurement of Energy MCQ || Measurement of Energy Questions and Answers Read More »
1. An electronic energy meter makes use of _______ IC Transformer CRO Multimeter 2. Full load Unity power factor adjustment in energy meter involves _________ Adjusting the loads at a unity power factor Applying rated voltage to pressure coil and a p.f. of unity for current coil Only applying rated voltage to pressure coil …
Electronic Energy Meter MCQ || Electronic Energy Meter Questions and Answers Read More »
1. Bondel’s Theorem is applicable to Wattmeter Only Energy Meter Only Both wattmeter and Energy Meter Voltmeter 2. The type of arrangement used to measure the power through the energy meter is Three-phase Four-wire system Three-phase Three-wire System Both 1 and 2 DC System 3. A three-element energy meter is used for _______ …
3-phase Energy Meter MCQ || Polyphase Energy Meter Questions and Answers Read More »
1. The incorrect magnitude of flux in an energy meter is due to __________ Abnormal currents and voltages High resistance and inductance values Changes in the transformer turn Induced e.m.f in the windings 2. In some energy meters, creeping can be avoided by attaching __________ Small gold pieces Small aluminum pieces Small iron pieces …
1. Induction type instruments are used for _______ A.C. measurements D.C. measurements Resistance measurements Voltage measurements 2. The meter constant of a single-phase energy meter is 500 rev/kWh. The meter takes 86 seconds to make 50 revolutions while measuring a full load of 4.4 kW. The percentage error in the meter is – 2.43% …
Induction-type single-phase Energy Meter MCQ || Energy Meter Questions and Answers Read More »
1. In vector impedance meter, the coverage of instrument can be obtained with V-I characteristics of the test system Power-frequency plot Sweep frequency plots of impedance and phase angle versus frequency Voltage-angle plot 2. For measurement of which of the following is a Low Power Factor (LPF) wattmeter NOT suitable? Measurement of power in …
