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UGC-NET 2018: (EMI) SpeedTest Quiz 30
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Question 1
The coil of a moving iron instrument has a resistance of 300 Ω and an inductance of 0.8 H. It reads 220 V when a 220 V dc is applied. If series resistance is 1500 Ω, its reading when fed by 220 V, 60 Hz ac will be
Question 2
The pointer of a moving coil instrument gives full scale deflection of 20mA. The potential difference across the meter when carrying 20mA is 300mV. The instrument to be used is 200A for full scale deflection. Find the shunt resistance required to achieve this, if the instrument to be used as a voltmeter for full scale reading with 4000V. Find the series resistance to be connected it?
Question 3
A multi range DC voltmeter requires 10 mA to give full scale defelction, its resistance is 10 Ω’s. Find the resistance to be connected in series to extend the range of DC voltmeter.
(1) (0 – 10) V
(2) (0 - 50) V
(1) (0 – 10) V
(2) (0 - 50) V
Question 4
For an instrument transformer: Accuracy class is the maximum allowable percentage composite error in Measured value.
Which of the following is impermissible value of measured current for 100 A of primary current in metering CT of Accuracy class 0.1?
Which of the following is impermissible value of measured current for 100 A of primary current in metering CT of Accuracy class 0.1?
Question 5
During light load condition compensating element used to absorb leading VARs to control the voltage level across load is –
Question 6
The periodic voltage form is shown in figure below is applied to a true rms meter, Determine the reading of instrument.
Question 7
A set of 6 measurements are recorded in an experiment as follows:
50.25, 50.00, 49.65, 49.35, 50.30, 50.75
Which is the most precise measurement?
50.25, 50.00, 49.65, 49.35, 50.30, 50.75
Which is the most precise measurement?
Question 8
In a modified carey foster bridge at balance condition R3= 20 Ω, R4=100 Ω, L1=25m H, M = 5000. Find the unknown capacitance C3 (in µF).
Question 9
A maxwell capacitance bridge is used to measure unknown inductance in comparison with capacitance. Where R2=100Ω, R3 = 200 Ω, R4= 300 Ω and C4=1 µF. calculate the value of inductance ______(fiil in the blanks).Calculate the value of R1 ?
Question 10
Find the resistance and inductance of the coil if the arms of an a.c. Maxwell Bridge are given as: AB and BC are non-reactive resistors of value 100 Ω each. Let DA is a standard variable reactor and value of L1 of resistance 32.7Ω and CD comprises a standard variable resistor R connected in series with a coil of unknown impedance. Balance was obtained with L1=47.8mH and R=1.36Ω?
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Dec 1ESE & GATE EC
