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A gear drive consists of two gears, A and B, and has a velocity ratio of 1.50. Gear A, the
smaller of the two gears, revolves at 126 rpm in the clockwise direction, and has 28 teeth.
If the gears have a module of 2 mm, determine:
i)
The number of teeth on Gear B.
ii)
The pitch (reference) diameters for the two gears.
iii) The addendum.
iv) The dedendum.
v)
The circular pitch.
vi) The tooth thickness.
vii) The speed of Gear B.
viii) The theoretical centre distance of the two gears.
At what temperature the saturation current will be the twice of the diode current
when the contact potential of the diode is 15 V. Assuming the diode is made by
silicon material.
Find the solution of the diffusion equation in the base region where the
diffusion length is .02 m and the distance between emitter depletion region and
collector depletion region is 1 cm. Given that the hole concentration at the
emitter depletion region is 100 cm-3 whereas the hole concentration at the
collector depletion region can be neglected.
Describe any five challenges in analysing climate change using remote sensing.
The hot resistance of an incandescent lamp is 10 ohms and the rated voltage is 50 V. Find the resistance required to operate the lamp from an 80 V supply.
xt: In the figure shown, the end 'A' of a bar AB is constrained to move along Vertical path AD and the bar passes through a swivel bearing pivoted at C. When A has a velocity of 3 m/s towards D, determine velocity of sliding of the bar through the swivel and angular velocity of AB. C on AB E at swivel 30 Di 0.4 m
A process has a distillation column, where a crude dichlorobenzene is pumped from a storage tank. Nitrogen is used to blanketing the column and the pressure above the liquid surface is held constant at 0.1 bar gauge pressure. The minimum depth of liquid in the tank is 1 m. The distillation column operates at a pressure of 500 mmHg. The feed point to the column is 16 m above the base of the tank. The tank and column are connected by a 50 mm internal diameter commercial steel pipe, 220 m long. The pipe run from the tank to the column contains the following valves and fittings: 20 standard radius 90° elbows: two gate valves to isolate the pump an orifice plate and a flow-control valve. If the maximum flow-rate required is 20,000 kg/h, calculate the pump motor rating (power) needed. Take the pump efficiency as 70 per cent and allow for a pressure drop of 0.5 bar across the control valve and a loss of 10 velocity heads across the orifice. (Density of the dichlorobenzene 1300 kg/m3, viscosity 1.4 cp).
Class Coordinator of the section 01 wants to select the student class representative. A student is
eligible to become class representative if he/she has scored minimum of 75% in 12th Standard and
less than 15K ranking in the entrance test.
A software needs to be developed to help Class coordinator to select the class representative.
1. Students rank in entrance test should be captured.
2. Students 12th percentage should be captured.
3. Check if rank is less than 15k and 12th percentage is more than 75%
4. If both the criteria is true, Display Eligible.
5. If any one of the criteria is false, Display Not Eligible
a. What is doping?
[2 marks]
b. Describe the difference between majority and minority carriers.
[4 marks]
c. With the use if diagrams explain how a diode is connected in reverse and forward bias.
[8 marks]
d. Draw and label the characteristics curve for a silicon pn junction diode.
[5 marks]
e. Explain with the use of a diagram how a full wave rectifier converts ac current to direct current.
a. Define the following terms:
i. Permeability ii. Magnetic field strength iii. Magnetic flux density
[3 marks]
b.
i. Determine the inductance of a coil 0.01m long, 4 turns, cross-sectional area of
0. Im2 with a permeability of the core material is 0.25x10-3H/m.
[4 marks]
ii. If a current of 3A flow for 5ms what is the induce voltage.
[2 marks]
c. Calculate the flux density produced by a magnetizing force of 2000 At/m in a steel of relative permeability 400.
#339914 on Dec 2023