Electrical Circuits Mid - II, November - 2014

1.If there are b branches and n nodes the number of equations will be
  • n-1
  • b
  • b-n
  • b-n+1
Answer: D
2.A closed path made by several branches of the network is known as
  • Circuit
  • Loop
  • Junction
  • Branch
Answer: A
3.The maximum efficiency of power transfer to load is
  • 25%
  • 50%
  • 75%
  • 100%
Answer: B
4.Tellegen’s theorem is applicable to
  • Linear networks only
  • Non-linear networks only
  • Both linear and non-linear networks
  • None of the above.
Answer: C
5.Superposition theorem can be applied only to _________ networks.
  • Linear
  • Non-linear
  • linear bilateral
  • bilateral
Answer: C
6.Two coupled coils with L1 = L2 = 0.6 H have a coupling coefficient of k = 0.8.The turn ratio N1/N2will be
  • 4
  • 2
  • 0.5
  • 1
Answer: D
7.The dual element of resistance is
  • conductance
  • inductance
  • capacitance
  • open circuit
Answer: A
8.Thevenins’s resistance Rth is determined ___________
  • By short circuiting given two terminals
  • By replacing voltage sources with their internal resistance
  • Between same open terminals for Vth
  • Between the two open terminals
Answer: B
9.Cutset matrix is generally used to find_______________
  • Branch voltages
  • Branch currents
  • Branch impedance
  • None
Answer: A
10.Superposition theorem cannot be applied to calculate ___________
  • voltage
  • current
  • power
  • All the above
Answer: C
11.While calculating Rth, constant current sources in the circuit are replaced by_________
Answer: OPEN
12.If Ri = RL is for maximum power transfer, then maximum power transferred is given by _______
Answer: E SQUARE/4R SQUARE
13.The unit of permeability is ______________
Answer: H/M
14.A 12V source with an internal resistance of 1.2ohmis connected across a wire wound resistor. Maximum power is dissipated in the resistor when its resistance is equal to _________ohm
Answer: 1.2 OHM
15.The mmf of magnetic circuit is analogous to________in electrical circuit
Answer: EMF
16.Oriented graph is also called as ___________graph
Answer: DIRECTED
17.Two identical 3A, 1ohm batteries are connected in parallel with like polarities to like. The Norton Equivalent circuit of combination is _______ Amp. & ______ohm
Answer: 6A, 0.5 OHM
18.In tellgen’s theorem the sum of instaneous powers for n branches in a network is always ___________
Answer: ZERO
19.The ratio of E/I in reciprocity theorem is called ______________resistance.
Answer: TRANSFER
20.The phase angle of series RLC circuit at resonance is ___________
Answer: ZERO