Principles of Electrical Engineering Mid - I, February - 2011

1.A capacitor does not allow sudden changes in
  • currents
  • voltages
  • both a and b
  • power
Answer: B
2.The time constant of a series RC circuit is
  • 1/RC
  • R/C
  • RC
  • C/R
Answer: C
3.A low pass filter is one which
  • passes all low frequency
  • attenuates all high frequencies
  • passes all frequencies upto cutoff frequency and attenuates all other frequencies
  • both a and b
Answer: C
5.For a prototype high pass filter, the series element is
  • resistive
  • inductive
  • capacitive
  • both R and L
Answer: C
6.For an H-type attenuator matched to a transmission line of 600ohms impedance each of the series resistance is 2400ohms. The value of the shunt resistance will be ________ ohms
  • 95
  • 135
  • 216
  • 840
Answer: B
7.The transient response occurs
  • only in R circuits
  • only in L circuits
  • only in C circuits
  • both b and c
Answer: D
8.A two port network is simply a network inside a black box, and the network has only
  • two terminals
  • two pairs of accessible terminals
  • two pairs of ports
  • all above
Answer: B
9.Which parameters are widely used in transmission line theory
  • Z parameters
  • Y parameters
  • ABCD parameters
  • h parameters
Answer: C
10.In the m-derived high pass filters the resonant frequency is to be
  • above the cutoff
  • below the cutoff
  • both a and b
  • none
Answer: B
11.An ideal filter should have zero attenuation in _________________.
Answer: pass band
12.In the m-derived high pass filters the resonant frequency is to be below the ______________.
Answer: cut off frequency
13.The time constant of a series RL circuit is ________.
Answer: L/R
14.When a series RL circuit is connected to a voltage v at t=0, the current passing through the L at t=0 is ____________.
Answer: zero
15.The h parameters h11 and h12 are obtained by shorting ____________ terminals.
Answer: output
16.The number of possible combinations generated by four variables taken two at a time in a two port network is __________.
Answer: six
17.If Z11=2ohms, Z12=1ohms, Z21=1ohms, Z22=3ohms, determinant of admittance matrix is _______.
Answer: one
18.The condition for a two port network to be reciprocal is ____________.
Answer: h21 = -h12
19.In the m-derived low pass filters the resonant frequency is to be above the ___________
Answer: cut off frequency
20.If the z-parameters of a two-port network are z11=5ohm, z22=7ohm,z12=z21=3ohm then the ABCD parameters are ___________________________ respectively.
Answer: 5/3 ,26/3 ,1/3 ,7/3