Fundamentals of Electrical Engineering Mid - I, September - 2014

1.If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
  • increases
  • decreases
  • remains same
  • doubles
Answer: B
2.The unit for permeability is
  • Wb/At × m
  • At/m
  • At/Wb
  • Wb
Answer: A
3.When the north poles of two bar magnets are brought close together, there will be
  • no force
  • a downward force
  • a force of attraction
  • a force of repulsion
Answer: D
4.Which of the following is not an electrical quantity?
  • Voltage
  • Current
  • distance
  • power
Answer: C
5.Kirchhoff's voltage law is based on law of conservation of ________________________
  • Charge
  • Energy
  • Current
  • None
Answer: B
6.If the peak of a sine weve is 13V, the peak-to-peak value is
  • 605V
  • 13V
  • 26V
  • non of the above
Answer: C
7.Two series resistors are connected to an ac source. If there are 7.5 V rms across one resistor and 4.2 V rms across the other, the peak source voltage is
  • 16.54 V
  • 1.65 V
  • 10.60 V
  • 5.93 V
Answer: A
8.The voltage across a coil when di/de = 20mA/ s and L = 8 H is
  • 16m V
  • 160m V
  • 1.6m V
  • 2.5m V
Answer: B
9.In a series RLC circuit that is operating above the resonant frequency, the current
  • lags the applied voltage
  • is in phase with the applied voltage
  • leads the applied voltage
  • is zero
Answer: B
10.In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of the source voltage is ____________
  • 40V
  • 290V
  • 250V
  • 125V
Answer: A
11.One sine wave has a positive-going zero crossing at 150 and another sine wave has a positive-going zero crossing at 550. The phase angle between the two waveforms is _________
Answer: 400
12.An electric heater draws 3.5 A from a 110 V source. The resistance of the heating element is approximately ___________________
Answer: 31Ω
13.The average value of a 20V peak sine wave over one complete cycle is________________
Answer: 0V
14.If the rms current through a 6.8 kΩ resistor is 8 mA, the rms voltage drop across the resistor is _________________
Answer: 54.4V
15.The parallel combination of a 470Ω resistor and a 680Ω resistor is in series with the parallel combination of four 2 kΩ resistors. The total resistance is______________________
Answer: 778Ω
16.super position theorem is not applicable for calculating ______________
Answer: Power
17.In a series RLC circuit that is operating above the resonant frequency, the current ______________________ the applied voltage
Answer: Lags
18.An ideal current source should have __________ resistance.
Answer: Infinite
19.The reciprocal of impedance is ________________
Answer: Admittance
20.Superposition Theorem can be applicable only to circuit having _________________
Answer: Linear bilateral elements