Q. A three-phase 50 Hz, 400 kV transmission line is 300 km long. The line inductance is 1 mH/km per phase, and the capacitance is 0.01 µF/km per phase. The line is under open circuit condition at the receiving end and energized with 400 kV at the sending end, the receiving end line voltage in […]
Q. A 220 V (line), three-phase, Y-connected, synchronous motor has a synchronous impedance of (0.25 + 𝑗2.5) Ω/phase. The motor draws the rated current of 10 A at 0.8 pf leading. The rms value of line-to-line internal voltage in volts (round off to two decimal places) is Solution:
Q. A delta-connected, 3.7 kW, 400 V(line), three-phase, 4-pole, 50-Hz squirrel-cage induction motor has the following equivalent circuit parameters per phase referred to the stator: 𝑅1 = 5.39 Ω, 𝑅2 = 5.72 Ω, 𝑋1 = 𝑋2 = 8.22 Ω. Neglect shunt branch in the equivalent circuit. The starting line current in amperes (round off to
Q. A 220 V DC shunt motor takes 3 A at no-load. It draws 25 A when running at full-load at 1500 rpm. The armature and shunt resistances are 0.5 Ω and 220 Ω, respectively. The no- load speed in rpm (round off to two decimal places) is . Solution:
Q. A single-phase transformer of rating 25 kVA, supplies a 12 kW load at power factor of 0.6 lagging. The additional load at unity power factor in kW (round off to two decimal places) that may be added before this transformer exceeds its rated kVA is . Solution:
Q. The magnetic circuit shown below has uniform cross-sectional area and air gap of 0.2 cm. The mean path length of the core is 40 cm. Assume that leakage and fringing fluxes are negligible. When the core relative permeability is assumed to be infinite, the magnetic flux density computed in the air gap is 1
Q. The voltage across and the current through a load are expressed as follows The average power in watts (round off to one decimal place) consumed by the load is Solution:
The voltage across and the current through a load are expressed as follows Read More »
Daily Quiz on Current Affairs 7 August 2023 is very important for Competitive Exams like SSC, Railway, RRB, Banking, IBPS, PSC, UPSC, etc. Our Gkseries team have composed these Current Affairs Quizzes from Newspapers like The Hindu and other competitive magazines.
Daily Quiz on Current Affairs by Gkseries – 7 August 2023 Read More »
Q. A 0.1 µF capacitor charged to 100 V is discharged through a 1 kΩ resistor. The time in ms (round off to two decimal places) required for the voltage across the capacitor to drop to 1 V is _______ Solution:
Q. The probability of a resistor being defective is 0.02. There are 50 such resistors in a circuit. The probability of two or more defective resistors in the circuit (round off to two decimal places) is . Solution: Probability of a resistor being defective (P) = 0.02 Number of resistors (n) = 50 Mean (λ)
