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Consider a 10-GHz airborne radar traveling straight, level, and forward at
200mph at an altitude of 30,000 feet. The antenna is pointed at an azimuth angle of
0degree and an elevation angle of -20 degree. What will be the radial velocity in meters per
second of echoes for stationary scatterers in the following locations:
(a) Directly ahead of the aircraft,
(b) At the point where the antenna boresight intercepts the ground,
(c) Directly below the aircraft,
(d) On the ground directly to the left or right of the aircraft (azimuth angle of +- 90degree),
and
(e) Directly behind the aircraft?
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.
Two coils A and B are wound on same iron core. There are 500 turns on coil A and 3000 turns on coil B. A current of 5A through coil A produces a flux of 600x10 wb in core. If
this current is reversed in 0.02sec, claculate average e.m.f. Induced in coils A and B.
A microwave detector is being used to measure the velocity of a vehicle driving normally to the face of the detector. The microwave detector has the following properties and inputs: Frequency f0 = 24.15 GHz Doppler frequency shift = 50 Hz S = 0.5 mV/g How fast is the vehicle going in meters/sec?
An accelerometer has the following properties:
Stiffness k = 500,000 N/m
Mass m = .01 Kg
Damping coefficient c = 95 N-sec/m
What is the damping ratio of the accelerometer?
A platinum wire has Poisson’s ratio ν = 0.39, and resistivity ρ of 1.06 x 10-7 ohm-meter. When the wire is pulled, the axial strain εA is 0.08 and the resistivity increases to 1.07 x 10-7 ohm-meter. What is the gauge factor of the platinum wire? (
Design an inverting amplifier with a gain of 60 for audio applications (Check frequency range of audio applications). The gain should not drop more than 0.55dB at the highest frequency. Maximum input amplitude is 250mV (peak), and the output is to be free of slew-rate limitation. Find the minimum Gain-Bandwidth product (GBP) and slew rate required from an op-amp to satisfy these requirements. Mention the name of practical Op-Amp 1C which can be used for constructing the hardware.
