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NHPC-JE’21 EE: Daily Practices Quiz
NHPC-JE’21 EE: Daily Practices Quiz 25-Oct-2021
Each question carries 1 mark.
Negative marking: 1/4 mark
Total Questions: 06
Time: 06 min.
Q1. The overall power factor of an on-load transformer………
(a) Is always unity
(b) Is always lagging
(c) Is always leading
(d) Depends on the power factor of the load
Q2. Dynamic breaking can be used for which of the following?
(a) Series motors
(b) Shunt motors
(c) Compound motors
(d) All of the above
Q3. The fuse is installed in which of the following wire?
(d) All of the above
Q4. Which of the following can measure the resistance having the value below 1 Ohms most precisely?
(a) Kelvin’s Double Bridge
(d) Wheatstone Bridge
Q5. The area of the hysteresis loop for a specimen is found to be large. This means that the hysteresis loss in this specimen would be
Q6. The energy meter used in homes is an example of
(a) Indicating instrument
(b) Recording instrument
(c) Comparison instrument
(d) Integrating instrument
Sol. The power factor depends on the load of system.
Sol. All of the above-mentioned options are correct.
Sol. A fuse is a protective device against the overcurrent fault. So, we connect the fuse in series with phase as the load current flows through it and when an abnormal condition happens(overload)above the rated current of the fuse that melts down and breaks the circuit from electric potential.
Sol. Kelvin’s bridge is a modification of Wheatstone’s bridge and is used to measure values of resistance below 1Ω.
Sol. Ph=kh Bm^x fV
So, hysteresis loss directly proportional to frequency and volume of material. If area of hysteresis loop is large then hysteresis loss will be large.
Sol. Integrating instruments add up the electrical quantity, i.e., electrical energy and measure the total energy (in kilowatt hours) or the total Amper hours (in ampere-hours) supplied to a circuit in a given period.