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?
- 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