The excitation current of a C.T. _________(a) varies over a fixed range of operation(b) varies over a wide range of normal operation(c) is fixed over a range of operation(d) is fixed alwaysThe question was posed to me at a job interview.Query is from Differences between C.T. and P.T. in section Extension of Instrument Ranges of Electrical Measurements

The excitation current of a C.T. _________(a) varies over a fixed rang

1.	The excitation current of a C.T. _________(a) varies over a fixed range of operation(b) varies over a wide range of normal operation(c) is fixed over a range of operation(d) is fixed alwaysThe question was posed to me at a job interview.Query is from Differences between C.T. and P.T. in section Extension of Instrument Ranges of Electrical Measurements
Answer» Right option is (B) varies over a WIDE range of normal operation The explanation is: In a potential transformer, the excitation current REMAINS constant under normal operation. While in a current transformer, the excitation current varies over a wide range of OPERATIONS.

Discussion

No Comment Found

Related InterviewSolutions

A 110V voltmeter can measure a voltage of upto 110kV using a _________(a) 110000/110V P.T.(b) 110000V P.T.(c) 110V P.T.(d) 110/110000V P.T.This question was addressed to me by my college director while I was bunking the class.I need to ask this question from Advantages of Instrument Transformers in portion Extension of Instrument Ranges of Electrical Measurements
A 5A ammeter can measure a current of upto 1000 A using a _________(a) 5/1000A C.T.(b) 1000A C.T.(c) 5A C.T.(d) 1000/5A C.T.This question was addressed to me at a job interview.This intriguing question comes from Advantages of Instrument Transformers in division Extension of Instrument Ranges of Electrical Measurements
The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The logarithmic decrement is?(a) 0.225(b) 0.565(c) 0.484(d) 0.7887I got this question during an interview for a job.My question is based upon Advanced Problems on Indicating Instruments topic in section Extension of Instrument Ranges of Electrical Measurements
A PMMC rated as 100 μA is used in a rectifier type of instrument which uses full wave rectification. What is the sensitivity on sinusoidal AC?(a) 4.5 kΩ/V(b) 18 kΩ/V(c) 10 kΩ/V(d) 9 kΩ/VThe question was asked in homework.My question is taken from Advanced Problems on Indicating Instruments topic in portion Extension of Instrument Ranges of Electrical Measurements
The discharge of a capacitor through a ballistic galvanometer produces a damped frequency of 0.125 Hz and successive swings of 120, 96 and 76.8 mm. The damping ratio is?(a) 0.0568(b) 0.0887(c) 0.0357(d) 0.0441The question was posed to me in an online quiz.This interesting question is from Advanced Problems on Indicating Instruments in portion Extension of Instrument Ranges of Electrical Measurements
Two 100 μA full-scale PMMC meters are employed to construct a 10 V and a 100 V full-scale voltmeter. These meters will have figure of merit (sensitivities) as?(a) 10 kΩ/V and 10 kΩ/V(b) 100 kΩ/V and 10 kΩ/V(c) 10 kΩ/V and 100 kΩ/V(d) 10 kΩ/V and 1 kΩ/VThe question was posed to me in an online quiz.Asked question is from Advanced Problems on Indicating Instruments topic in division Extension of Instrument Ranges of Electrical Measurements
A moving coil of a meter has 250 turns and a length and depth of 40 mm and 30 mm respectively. It is positioned in a uniform radial flux density of 450 mT. The coil carries a current of 160 mA. The torque on the coil is?(a) 0.0216 N-m(b) 0.0456 N-m(c) 0.1448 N-m(d) 1 N-mI had been asked this question in unit test.My question is taken from Advanced Problems on Indicating Instruments in portion Extension of Instrument Ranges of Electrical Measurements
A moving iron ammeter produces a full-scale torque of 240 μN-m with a deflection of 120° at a current of 10 A. the rate of change of self-inductance (μH/rad) of the instrument at full scale is?(a) 2.0 μH/rad(b) 4.8 μH/rad(c) 12.0 μH/rad(d) 114.6 μH/radThe question was asked in an online quiz.The origin of the question is Advanced Problems on Indicating Instruments topic in chapter Extension of Instrument Ranges of Electrical Measurements
A 50 Hz voltage is measured with a moving iron voltmeter and a rectifier type AC voltmeter connected in parallel. If the meter readings are Va and Vb respectively. Then the form factor may be estimated as?(a) \(\frac{V_a}{V_b}\)(b) \(\frac{1.11 V_a}{V_b}\)(c) \(\frac{\sqrt{2} V_a}{V_b}\)(d) \(\frac{π V_a}{V_b}\)I had been asked this question in an online quiz.I'd like to ask this question from Advanced Problems on Indicating Instruments topic in section Extension of Instrument Ranges of Electrical Measurements
A current of [2 + \(\sqrt{2}\) sin (314t + 30) + 2\(\sqrt{2}\) cos (952t +45)] is measured with a thermocouple type, 5A full scale, class 1 meter. The meter reading would lie in the range?(a) 5 A ± 1 %(b) (2 + 3\(\sqrt{2}\)) A ± 1%(c) 3 A ± 1.7 %(d) 2 A ± 2.5 %The question was posed to me during an online exam.My query is from Advanced Problems on Indicating Instruments topic in section Extension of Instrument Ranges of Electrical Measurements

Discussion

No Comment Found

Related InterviewSolutions

Reply to Comment