Search & Filtering
A coil with resistance ‘
6
’
Ω
,
and
inductance
‘
8
’ mH
is connected
in parallel
with a
series
combination of
a
resist
or and
capacitor
having
resistance R
Ω and
reactance X
c
Ω.
If
t
he equivalent
impedance
of the resulting circuit is
Z =
5
/0
o
Ω at
ω
=1000 rad/sec
. Find the
values of R & C
.
The resistivity and temperature coefficient of resistance of Evanohm are 800 CM-Ω/ft and
20 x 10-6 /C, respectively, at 20C. A #40 round wire has a diameter of 0.00314 in. Find the resistance of a 14.79 in long sample of a #40 round Evanohm wire at (a) 20C, and
(b) 520C.
Analyze the signal H(t) = 5e^t U(t) This signal is discretized at a sampling frequency of 1kHz.
a)What is the expression for the discrete-time signal in n-domain?
b)Is this discrete-time signal periodic or aperiodic ? If it is periodic, find its period.
c) Find the spectrum of the discrete-time signal using Discrete-Time Fourier Transform.
d) Plot magnitude spectrum for at least two periods. You can use Matlab to plot it.
e)Find the Z-transform along with the Region of Convergence of this discrete-time signal.
How many operating forces are necessary for successful operation of an indicating instrument? Explain the methods of providing these forces.
How can the current range of a PMMC instrument be extended with the help of shunts?
A Country’s Government has approved a relocation plan for a section of its population to inhabit a 3-island portion. Design a hypothetical Telecommunication network(Fixed and mobility consideration) for both internal and external communication.
Consider the following
Islands location is 5000km from the main land
Islands are equidistant from one another
Accessibility by water transport
Government very resourceful – enough money
A lot of economic activity on the Islands (billions of dollars annually)
1.5 million population with 80% adults
120-kilometre bridge links the three islands
1．Radio Frequency circuit is mainly used for? （ ）.
A． Processing audio signals
B． Wireless communication
C． Generate sine waves
D． Supply power
a shunt motor is running off a 220 - V supply taking an armature current of 15A , the resistance of the armature circuit being 0.8ohms . calculate the value of the generated e.m.f . jf the flux were suddenly reduced by 10 percent , to what value would the armature current increase momentarily ?
A shunt machine is running as a motor off a 500 - V system , taking an armature current of 50 A. if the field current is suddenly increased so as to increase the flux by 20 per cent , calculate the value of the current that would momentarily be fed back into the mains . neglect the shunt current and assume the resistance of the armature circuit to be 0.5 ohms.
