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A mine consists of a single stoping section located at a depth of 2200 m accessed by a shaft. If a total of 8 rock drills each consuming 0.06 kg/s of air are used in the stoping section that is located a total distance of 2000m from the shaft bottom.
Determine the pressure and quantity requirements required of a compressor at surface to service the requirements of these rock drills.
It can be assumed that the active drilling section of the stope is located 450 m from the intake airway in which the compressed air main is located.
The maximum length of hose connected to the rock drills is 100m. It may also be assumed that the average atmospheric pressure at the surface is 100 kPa, underground the atmospheric pressure is 105 kPa and that steel pipe is used to convey the compressed air. There is no receiver in the system, thus assume the drills are working continuously.
The hoses used to supply the compressed air are 25 mm diameter and all other pipes in the system are of 152mm diameter.
The resistance factor for a 25 mm hose is and for a 152mm pipe are 3,000,000 m-5 and 200 m-5 respectively.
The temperature decreases by 33.8 C°. Determine the fractional decrease L/(LSilver + LGold) in the rod's length, where LSilver and LGold are the initial lengths of the silver and gold rods.
In a scanning electron microscope, an electron is accelerated by a static electrode biased with a 12 kV voltage relative to the electron source. Upon bombarding the sample the electron “kick out†photons with specific wavelength.
given the vector field g 2xsup2y ax - 2z-x ay 3xyz az find a g at p2-34 b a unit vecotr in the direction of g at p
What is the minimum energy (in MeV) that is required to break a nucleus of 12C (of mass 11.99671 u) into three nuclei of 4He (of mass 4.00151 u each)
An FSK system with Rb = 110bits/sec is transmitted over an RF Channel with white noise. The receiver uses non-coherent detection. If Eb/N = 5dB, evaluate Pb for this system.
A network connected between terminals a and b consists of two parallel combinations that are in series. The first parallel combination is composed of a 10-phm resistor and a 15-ohm resistor. The second parallel combination is composed.
A random signal X can be observed only in the presence of independent addictive noise N. The observed quantity is Y = X + N.The joint probability density function of X and Y is f(x,y) = K exp[-(x2 + y2 + 4xy)] all x and y
Problem 1: Determine the design capacity of the unstiffened plate girder web of Grade 300 steel shown in the below figure.
Using a voltage source Vdd=2.5V and an MOSFET with Vt=0.5 V, Kn'=0.8 A/V^2, W=10um and lambda=0, build a common source amplifier which drives a load resistor of 10k ohms. The input signal to the amplifier is a sine wave with a peak value of 0.15 V..
consider a message signal m(t)= e^(-2t) cos(2000*pi*t) u(t) a) determine the minimum step size E necessary to avoid slope overload b) calculate the minimum avaerage quantazation noise power based on part a
One mole of oxygen expands at a constant temperature T of 310 K from an initial volume of 12 Lto a final volume 19 L. In this expansion internal energy is constant. How much heat is taken by the gas during the expansion
Suppose it is known that a 5MHz transducer axis makes an angle of 30 degrees relative to the direction of motion of blood in a vessel. If the Doppler frequency is measured to be +500Hz, what is the velocity of the blood
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