Electrical Engineering Answers

V=10 sin 2π100t

Draw a well-labelled diagram of the traverse section of a motor field winding showing the interpoles. What is the function of the interpoles?

6. Draw a picture of the following functions, defined over (−π, π): f(x) = x (π − |x|) g(x) = |x|(π − |x|) h(x) = x (π − x) k(x) = |x|(π − x)

A sequential circuit has two inputs, w₁ and w₂, and output, z. Its functon is to compare the input sequences on the two inputs. If w₁ = w₂ during any four consecutive clock cycles, the circuit produces z = 1; otherwise, z = 0. For example

w₁ : 0110111000110

w₂ : 1110101000111

z : 0000100001110

Derive a suitable circuit.

Consider a continuous wave (single tone)

transmitted waveform of carrier frequency . The signal impinges on a target, moving

with radial velocity , and returns to the radar. The resulting signal, after down-

conversion from an IQ quadrature receiver, is given by

In the above expression, is the strength of the returned signal, is the positive

Doppler shift due to the target’s radial motion and t is the slow time. The signal over

a duration of T is digitized with a sampling frequency . Process the signal using

Fourier transform to obtain the correct estimate of the target velocity. Use the

values in the table below.

S. No. Parameters Values

1 Carrier frequency ( 5 GHz

2 Sampling frequency (.) 500 Hz

3 Dwell time (T) 1 second

4 Target return strength () 1 Volt

5 Radial velocity (,) 3 m/s

Consider two radars. The first is a 3-GHz weather radar having a desired

unambiguous range of 300 km and unambiguous velocity of 50m/s. The second is.

10-GHz airborne radar having a desired unambiguous range of 100 km and

unambiguous velocity of 250 m/s. For each radar, is a 1 kHz PRF considered to be low

or high PRF?

For a single phase transformer with 250 primary turns and 50 secondary turns connected across a 1500V,50Hz supply, the maximum value of flux is

if a frequency of 1mhz is applied across the circuit below find the inductor reactance of the circuit calculate the current flowing through each inductor as well as the voltage drop across each inductor if the voltage applied is 230v.what will the inductor reactance be.If the frequency was induced to 500 in the diagram are given, L1 2H,L2 1H,L3 5H,L4 500mH

Using an appropriate diagram of magnetic field, describe the operation of a DC motor.

A motor winding has a resistance of 80 ohm at room temperature of 20 deg C before switching on to a 230V supply. After 4 hours run the winding resistance is 100 ohm. Find the temperature rise if the material resistance temperature co-effiecent is 1/234.5 deg C.