+1-415-315-9853

info@mywordsolution.com

## Engineering

 Civil Engineering Chemical Engineering Electrical & Electronics Mechanical Engineering Computer Engineering Engineering Mathematics MATLAB Other Engineering Digital Electronics Biochemical & Biotechnology

Answer the following problems in detail.

problem 1) prepare down the advantages and drawbacks of worm gear drives. Suggest materials for worm wheel and worm with proper justification.

problem 2) Load on the journal bearing is 180 kN due to turbine shaft of 300 mm diameter running at 2000 rpm. Find out the following:

(i) The Length of a bearing if the allowable bearing pressure is 1.6 N/mm2, and

(ii) Amount of heat to be removed by the lubricant per minute if the bearing temperature is 60°C and viscosity of the oil is 0.02 kg/m-s and the bearing clearance is 0.25 mm.

problem 3) prepare down the step-by step procedure for the selection of flat belt from manufacturer's catalogue for given application. Give all other information and recommendations required in selection.

problem 4) A pair of worm and worm wheel is designated as 3/60/10/6. The worm is transmitting 5kW at 1440 rpm to the worm wheel. The coefficient of friction is 0.1 and the normal pressure angle is 20°. Find out the lead angle, torque and component of gear tooth forces acting on the worm and worm wheel.

problem 5) Pair of spur gears with 20° full-depth involute teeth consists of a 20 teeth pinion meshing with 41 teeth gear. Module is 3 mm whereas the face width is 40mm. The material for the pinion as well as for the gear is steel with the ultimate tensile strength of 600 N/mm2. The gears are heat treated to a surface hardness of 400 BHN. The pinion rotates at 1450 rpm and the surface factor for the application is 1.75. Assume the velocity factor accounts for the dynamic load, and the factor of safety is 1.5. Find out wear strength, effective load, torque, beam strength and rated power of gears. Suppose lewis form factor as 0.32 for 20 teeth.

problem 6) A V-belt drive is needed for a 15 kW, 1440 rpm electric motor, that drives a centrifugal pump running at 360 rpm for a service of 24 hours per day. From space considerations, centre distance must be approximately 1m. Find out:

(a) Belt specifications

(b) number of belts

(c) correct centre distance, and

(d) pulley diameters

problem 7) A concentric spring is used as the valve spring in the heavy duty diesel engine. It contains two helical compression springs having same free length and same solid length. The composite spring is subjected to a maximum force of 6000 N and the corresponding deflection is 50 mm. The maximum torsional shear stress induced in each spring is 800 N/mm2. The spring index of each spring is 6. Suppose same material for two springs and the modulus of rigidity of spring material is 81370 N/mm2. Diametrical clearance between the coils is equal to the difference between their wire diameters. Compute:

(a) The axial force transmitted by each spring

(b) Wire and mean coil diameter of each spring

(c) Number of active coils in each spring.

Mechanical Engineering, Engineering

• Category:- Mechanical Engineering
• Reference No.:- M99080

Have any Question?

## Related Questions in Mechanical Engineering

### The tires of the 4555-lb sedan are 65 in wide figure p510

The tires of the 4555-lb sedan are 6.5 in. wide (Figure P5.10). Each tire contacts the ground over a distance of 4.25 in. as measured along the vehicle's length. Calculate the compressive stress between each tire and the ...

### Define a shear joint define an axial shear joint define

Define a shear joint? Define an axial shear joint? Define faying surface? Define friction-type joint? Define bearing-type joint? Draw a graph illustrating the way a shear joint fails? Is bolt preload important in a shear ...

### A closed cylindrical tank of length l radius r and wall

A closed cylindrical tank of length L, radius R, and wall thickness t contains a liquid at pressure p. If a hole is suddenly made in the cylinder, determine a. How much the tank radius R changes b. How much the tank leng ...

### The illustration below shows a vane with a turning angle

The illustration below shows a vane with a turning angle θ which moves with a steady speed v c . The vane receives a jet that leaves a fixed nozzle with speed θ. (a) Assume that the vane is mounted on rails as shown in t ...

### The total pressure of a mixture of oxygen and hydrogen is

The total pressure of a mixture of oxygen and hydrogen is 1.65 atm. The mixture is ignited and the water is removed. The remaining gas is pure hydrogen and exerts a pressure of 0.190 atm when measured at the same values ...

### Derive a formula for the minimum energy in the

Derive a formula for the minimum energy in the two-dimensional Using model, if the interaction energy between each spin and each of its eight nearest neighbors is -D. Assume that the model consists of a rectangular array ...

### 1 gas turbine and compressed air systems will serve as

1. Gas turbine and compressed air systems will serve as prime movers at a very high speed. Discuss the design characteristics of an induction generator for those applications. 2. Explain in detail why induction generator ...

### 1 consider the differential control volume shown below by

1. Consider the differential control volume shown below. By applying the conservation of mass and the momentum theorem, show that dP + pvdv + g dy = 0 2. Water flows steadily through the horizontal 30° pipe bend shown be ...

### The ground state 1s1 h atom has two hyperfine states f 0

The ground state 1s1 H atom has two hyperfine states, F = 0 and F = 1, which correspond to different relative orientations of the nuclear spin and electron spin. The transition between these two states has a wavelength o ...

### An athlete at high performance inhales of air at 10 atm and

An athlete at high performance inhales of air at 1.0 atm and 298 K at a respiration rate of 32 breaths per minute. If the exhaled and inhaled air contain 15.3 and 20.9% by volume of oxygen respectively, how many moles of ...

• 13,132 Experts

## Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

### WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

### Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

### Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

### Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

### Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro