Electrical Technology Mid - I, August - 2012

1.Mesh analysis based on
  • kirchhoff’s current law
  • kirchhoff’s voltage law
  • both
  • none
Answer: B
2.Norton’s equivalent circuit consists of
  • voltage source in parallel with resistance
  • voltage source in series with resistance
  • current source in parallel with resistance
  • current source in series with resistance
Answer: C
3.Maximum power is transferred when load impedance is
  • equal to source resistance
  • equal to zero
  • equal to half of the resistance
  • none of the above
Answer: A
4.In a pure resistor, the voltage and current are
  • out of phase
  • in phase
  • 90 deg out of phase
  • 45 deg out of phase
Answer: B
5.In a pure capacitor the voltage
  • is in phase with the current
  • is out of phase with the current
  • lags behind the current by 90 deg
  • leads the current by 90 deg
Answer: C
6.The current in a pure inductor
  • lags behind the voltage by 90 deg
  • leads the voltage by 90 deg
  • is in phase with the voltage
  • lags behind the voltage by 45 deg
Answer: A
7.A series RL circuit has resistance of 33kohm ,and an inductive reactance of 50kohm.what is the impedance and phase angle
  • 56.58kw,59.9 deg
  • 59.9kw,56.58deg
  • 59.9ohm,56.58 deg
  • 5.99ohm,56.58 deg
Answer: B
8.Which of the following theorems is applicable for both linear and non linear circuits?
  • superposition
  • Thevenin’s
  • Norton’s
  • None of the above
Answer: D
9.The nodal analysis is primarily based on the application of
  • ohm’s law
  • KCL
  • KVL
  • both(a) and(b)
Answer: B
10.In a certain parallel RL circuit ,R=0 ohm, XL=75 ohm. what is the admittance?
  • 0.024S
  • 75S
  • 50S
  • 1.5S
Answer: A
11.A circuit consists of two resistors R1 and R2 in parallel. Total current passing through the circuit is It .The current passing through the R1 is----------.
Answer: It*(R2/(R1+R2)_)
12.The rate of movement of charge in a conductor is known as-----------
Answer: current
13.In the RLC series circuit band width of resonant circuit is f2-f1=----------
Answer: f2-f1=R/(2*3.14L)
14.In RLC series circuit the resonant frequency fr=-------
Answer: fr=1/(2*3.14*sqrtLC)
15.The relation between quality factor and band width is-----------
Answer: B.W=fr/Q
16.The Phase angle for RLC series circuit at resonance is------
Answer: 0
17.The relationship between the line and phase voltage of a star connected circuit is----------
Answer: VL=1.732Vph
18.In the distribution system which connection is used-----------
Answer: 3-phase 4-wire
19.The winding having larger number of turns will be having--------induced emf.
Answer: more
20.The relationship between turns ratio and currents in a transformer is------------..
Answer: N2/N1=I1/I2