Q.1
A capacitor ofV,Hz is needed for AC supply. The peak voltage of the capacitor should be ____________
  • a) 110 V
  • b) 460 V
  • c) 220 V
  • d) 230 V
Q.2
A two branch parallel circuit has aΩ resistance andH inductance in one branch and a 1 μF capacitor in the second branch. It is fed fromV ac supply, at resonance, the input impedance of the circuit is _____________
  • a) 447.2 Ω
  • b) 500 Ω
  • c) 235.48 Ω
  • d) 325.64 Ω
Q.3
The impedance matrices of two, two-port network are given by [32and [5 25]. The impedance matrix of the resulting two-port network when the two networks are connected in series is ____________
  • a) [3 5; 2 25]
  • b) [18 7; 7 28]
  • c) [15 2; 5 3]
  • d) Indeterminate
Q.4
The electrical energy required to heat a bucket of water to a certain temperature iskWh. If heat losses, are 10%, the energy input is ____________
  • a) 2.67 kWh
  • b) 3 kWh
  • c) 2.5 kWh
  • d) 3.5 kWh
Q.5
The current rating of a cable depends on ___________
  • a) Length of the cable
  • b) Diameter of the cable
  • c) Both length and diameter of the cable
  • d) Neither length nor diameter of the cable
Q.6
In an AC circuit, the maximum and minimum values of power factor can be ___________
  • a) 2 and 0
  • b) 1 and 0
  • c) 0 and -1
  • d) 1 and -1
Q.7
In the circuit given below, the series circuit shown in figure, for series resonance, the value of the coupling coefficient, K will be?
  • a) 0.25
  • b) 0.5
  • c) 0.1
  • d) 1
Q.8
In an RC series circuit R =Ω and XC =Ω. Which of the following is possible?
Questionnetwork-theory-questions-answers8.jpg
  • a) The current and voltage are in phase
  • b) The current leads the voltage by about 6°
  • c) The current leads the voltage by about 84°
  • d) The current lags the voltage by about 6°
Q.9
The impedance of an RC series circuit isΩ at f =Hz. At f =Hz, the impedance will be?
  • a) More than 12
  • b) Less than 3
  • c) More than 3 Ω but less than 12 Ω
  • d) More than 12 Ω but less than 24 Ω
Q.10
A 3 phase balanced supply feeds a 3-phase unbalanced load. Power supplied to the load can be measured by ___________
  • a) 2 Wattmeter and 1 Wattmeter
  • b) 2 Wattmeter and 3 Wattmeter
  • c) 2 Wattmeter and 2 Wattmeter
  • d) Only 3 Wattmeter
Q.11
A series RC circuit has R =Ω and C = 1 μF. The current in the circuit is 5 sin 10t. The applied voltage is _____________
  • a) 218200 cos (10t – 89.99°)
  • b) 218200 sin (10t – 89.99°)
  • c) 218200 sin (10t)
  • d) 218200 cos (10t)
Q.12
A capacitor stores 0.at 5 V. Its capacitance is ____________
  • a) 0.75 F
  • b) 0.75 μF
  • c) 0.03 F
  • d) 0.03 μF
Q.13
For a transmission line, open circuit and short circuit impedances areΩ andΩ. Then characteristic impedance is ____________
  • a) 100 Ω
  • b) 50 Ω
  • c) 25 Ω
  • d) 200 Ω
0 h : 0 m : 1 s