Engineering Answers

Design a transistor fixed bias circuit with VCC = 12V, VBE = 0.7V, β=100 and RC =1KΩ to operate in middle of the Load line (for IC = 6mA), cut off region (for IC = 0.5

mA) and saturation region (for IC = 11.5 mA). Determine the corresponding values of

RB and VCEQ for the three different cases.

One thousand kilograms per hour of a mixture of benzene (B) and toluene (T) that contains 60 % benzene by mass are separated by distillation into two fractions. The mass flow rate of benzene in the top stream is 470 kg B/h, and that of toluene in the bottom stream is 350 kg T/h. The operation is at steady state. a. Draw and label the flowchart of the process. b. Write balances on benzene and toluene to calculate the unknown component flow rates in the output streams.

3 Explain if the priority method is not used, then what other possible method 

can be used to effectively access I/O devices. Give proper diagram and 

explanation of working.

(answer for 10 marks.)

Alight ray is incident from glass to air. If the transmitted power is 0 dB,

compute the reflected power.

This computer organization would not require registers to execute its instructions , elaborate properly with an example and diagram on how this mechanism works.

Give any 5 addressing modes which do not use the address given inside the instruction to fetch the given operand directly, instead they use one form or another for it.

Explain the process followed by CPU while completing the interrupts and resuming to instructions with proper steps.

(2x+3y-5)dx+(3x-y-2)dy=0

1, In a hydroelectric power plant, water enters the turbine nozzles at 800 kPa absolute with a low velocity. If the nozzle outlets are exposed to atmospheric pressure of 100 kPa, determine the maximum velocity to which water can be accelerated by the nozzles before striking the turbine blades.

2, An airplane is flying at an altitude of 12,000 m. Determine the gage pressure at the stagnation point on the nose of the plane if the speed of the plane is 300 km/h.

1. A 0.75-m^3 rigid tank initially contains air whose density is 1.18 kg/m^3. The tank is connected to a high- pressure supply line through a valve. The valve is opened, and air is allowed to enter the tank until the density in the tank rises to 4.95 kg/m^3. Determine the mass of air that has entered the tank.

2. A desktop computer is to be cooled by a fan whose flow rate is 0.40 m^3/min. Determine the mass flow rate of air through the fan at an elevation of 3400 m where the air density is 0.7 kg/m^3. Also, if the average velocity of air is not to exceed 110 m/min, determine the minimum diameter of the casing of the fan.