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a hollow cylindrical column is to carry a load of 20 kn where the outside diameter of the column is 100 mm. the length of the column is 5m. if the length of the column is mild steel (sy=250 mpa,e=200 gpa) determine the minimum thickness required for the column. use factor of safety of 2. considered eccentricity e=0.2m
A fluid is heated reversibly at a constant pressure of 1.05 bar until it has a specific
volume of 0.1 m3
/kg. It is then compressed reversibly according to a law pv=constant to a
pressure of 4.2 bar, then allowed to expand reversibly according to the law
pv1.3=constant, and is finally heated at constant volume back to the initial conditions. The
work done in the constant pressure process is 515 Nm and the mass of the fluid present is
0.2 kg. Calculate the net work done on or by the fluid in the cycle and sketch the cycle on
a p-v diagram
A screw jack is to lift a load of 80 kN through aheight of 400 mm. The elastic strength of screw material in tension and compression is 200 MPa and in shear 120 MPa. The material for nut is phosphorbronze for which the elastic limit may be taken as 100 MPa in tension, 90 MPa in compression and 80 MPa in shear. The bearing pressure between the nut and the screw is not to exceed 18 N/mm2. Design and draw the screw jack. The design should include the design of 1. screw, 2. nut, 3. handle and cup,and 4. body
Plot the variation in impedance wrt the frequency in a series RLC circuit fed with an alternating current supply of variable frequency.
A long transmission line delivers 10 kW into an antenna; at the transmitter end, the line current is 5 A, and at the coupling house (load) it is 4.8 A. Assuming the line to be properly terminated and the losses in the coupling system to be negligible, what is the power lost in the line?
Calculate the characteristic impedance for a line that exhibits an inductance of 4 nH/m and 1.5 pF/m
Let, the bandwidth of the message signal is 500 Hz. What should be the
value of ωc to avoid overlap in the spectra at DSB-SC modulation? Where
ωc = frequency of the carrier signal.
In an AM radio receiver the received signal is given as X1(t)
m(t)cos(2π10000t) where m(t) represents the message signal. We want to
translate the received signal to X2(t) = m(t)cos(2π5000t). Explain how can we
perform the above task.[You have to show the block diagram]
For an AM communication the modulating signal is given as
m(t) = 5 cos(2π500t) + 10 cos(2π1000t) + 20 cos(2π1500t) and the carrier
signal is given as c(t) = 50 cos(2π105t). Calculate:
(i) Upper Side band power
(ii) Lower Side band power
(iii) Total power delivered to the load of 1000Ω
(iv) Transmission efficiency
A 4-pole DC shunt generator with wave connected armature has 41 slots and 12 conductors per slot. Ra=0.5ohm, Rsh=200ohm and flux per pole is 125mWb. When the generator is driven at 1000rpm, calculate the voltage across and current through a 10ohm load resistance connected across the armature terminals and also calculate power developed by the armature.
