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2.Chickens with an average mass of 1.5 kg (k = 0.45W/m·K and 0.13 X10-6 m2/s) initially at a uniform temperature of 20°C are to be chilled in agitated brine at -7°C. The average heat transfer coefficient between the chicken and the brine is determined experimentally to be 440 W/m2·K. Taking the average density of the chicken to be 0.95 g/cm3 and treating the chicken as a spherical lump, determine thecenter and the surface temperatures of the chicken in 2 h and 30 min. Also, determine if any part of the chicken will freeze during this process.
Explain and show how ultrasonic range-finding works and is used. Include visual information wherever possible to most effectively convey the information. This section must be organized using headings and subheadings - consider the most effective l..
A box contains 50 diodes of which 10 are known to be bad. If the first diode drawn from the box was good, what is the probability that a second diode drawn will be good
the operation of an induction machine here used as an asynchronous generator her connected to a 3 phase electric system. a) What does asychronous mean in this context b) How is it possible to improve the operation of this generator on the system
1. What is the effect of increasing the quantization levels on the quantization error in a PCM signal 2. How can we increase the data rate in a digital signal
use any extragates in existing ICs for inverters when possible. Connect thecircuit and check its operation. the truth table for F1 and F2obtained from the circuit should conform with the minterms listed.
A 3-phase, 480 V motor with a starting current of 235 A is located 1800 ft (550 m) from the electrical power source. What size copper conductors should be used to ensure that the voltage drop will not exceed6% during starting.
The steering wheel of a car has a radius of 0.11 m, while the steering wheel of a truck has a radius of 0.28 m. The same force is applied in the same direction to each. What is the ratio of the torque produced by this force
for a Si conductor of length 5um, doped n-type at 10^15 cm^-3,calculate the current density for an applied voltage of 2.5 Vacross its legth. how about for a voltage of 2500V the electronand hole mobilities are 1500 cm^2/V-s and 500 cm^2/V-s,respec..
A charged 100- picoFarad capacitor has initial voltage across it of 10 V. A 100 kohm resistor is suddenly connected across the capacitor (at t=0) to discharge it. What is the magnitude of the instantaneous current at 20 usec
When carrying out an FFT of a cosine wave whose frequency is 0.1Hz and whose amplitude is unity , explain why the peak amplitude measurement obtained in the range 0.09Hz to 0.11Hz should ideally have a value of 0.5?
1. The voltage gain of an 11.2 kHz low-pass filter is -12 dB; what is its numeric gain 2. Two amplifiers are cascaded, one with a voltage gain of 6.02 db and the other with a voltage gain of 12. If 10 mV is measured at the input of the second ampl..
A 25KW, 250V dc shunt generator has armature and field resistances of 0.06 ohm and 100 ohm respectively, determine the total armature power developed when working (1) as a generator delivering 25KW output and (2) as a motor taking 25KW
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