Mechanical Engineering Answers

Mechanical Engineering

Design a C.I. flange coupling for a mild steel shaft transmitting 90 kW at 250 rpm. The allowable shear stress for shaft material is 40 MPa. The allowable shear stress and crushing stress for key and bolt material are 45 MPa and 85 MPa respectively. The permissible shear stress for C.I. is 14 MPa. The key is having square cross-section with (width)=(thickness)=[(diameter of shaft)|4]. The number of bolts is 6. The bolts are fitted in reamed and ground holesand are fingure tight.

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Question #222272

Mechanical Engineering

A bushed-pin type flexible coupling is used to connect two shafts and transmit 5 Kw power at 720 rpm. Shafts, keys and pins are made of commercial steel (Syt=Syc = 240 N/mm2) and the factor of safety is 3. The flonges are made of grey cast iron FG 200 (Sut = 200 N/mm2) and the factor of safety is 6. Assume, Ssy = 0.5 Syt and Ssu = 0.5 Sut. There are 4 pins. The pitch circle diameter of the pins is four times of shaft diameter. The permissible shear stress for pins is 35 N/mm2. The permissible bearing pressure for the rubber bushes is 1 N/mm2. The Key have square cross-section. Calculate,

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Question #222164

Mechanical Engineering

2.1 Propose 2 to 5 suitable engineering materials (metals or non-metals) can be used to fabricate following components. You may survey more relevant resource online. a. Roller conveyer b. Conveyer leg mountings with the floor c. Heating oven d. Dipping tank e. Safety measures for workers

2.2 Estimate different degradation possible at the factory environment taking 4 components of the setup described above and propose precautions

2.3 Propose different destructive and non-destructive techniques can be used to identify quality (e.g. external cracks, internal cracks, colour variation, properties) of following components/ parts or products. Assume that you have provided a standard data sheet on theoretical values of each properties.

a. Final rubber product (assuming thinner tank shape, see cross section in Figure 10) b. Mould base c. Roller guides and stand welding joints

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Question #222076

Mechanical Engineering

Propose different destruand nondestructive techniques can be used to identify quality of following components/parts or products.Assume that you have provided a standard data sheet on theoretical values of each properties

a) final rubber products
b)Mould base
c)Roller guides and stand welding joints

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Question #221991

Mechanical Engineering

Steam at 200 bar, 760 0 C enters the throttle of a reheater engine and expands to 10 bar. At 0 this point it leaves the engine, enters the reheater, and returns at 9 bar, 600 occurs to the condenser pressure of 0.05 bar (h f C, expands then = 138 kJ/kg) on the basis of flow of 1 kg steam. Find (a) W and e of the cycle (b) W, e and m for the ideal engine (c) in the actual engine the steam enters the reheater at 10 bar, 300 0 at the exhaust to the condenser , find W, e and m

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Question #221990

Mechanical Engineering

A steam turbine receives 362,500 kg/h of steam throttled at 8.7 MPa and 410 leaves the pressure 0 turbine shell at 2 MPa with 7.58 degrees of superheat. Reheated steam is at 1.9 MPa and 410 C. Condensate is at 78 0 C. For generator output of 100 MW at 94% efficiency, calculate (a) the combined thermal efficiency, (b) the actual condition of exhaust steam, (c) the thermal efficiency of the ideal engine, (d) the combined engine efficiency, and (e) the ideal thermal efficiency of the cycle without pressure drop through reheater

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Question #221987

Mechanical Engineering

With 3% moisture, 2.5 kg of steam has an enthalpy of 6600 kJ. It is heated at constant pressure to a final condition of 90

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Question #221985

Mechanical Engineering

One lb 0 of a mixture of steam and water at 160 psia is in rigid vessel. Heat is added to the vessel until the contains are at 560 psia and 600 F. Determine the quality of heat in kJ added to the water and steam in the tank

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Question #221984

Mechanical Engineering

A 1 kg steamActivity 2 0 water mixture at 1.0 MPa is contained in an inflexible tank. Heat is added until the pressure rises to 3.5 MPa and 400 C. Determine the heat added

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Question #221832

Mechanical Engineering

Assume a rectangular waveguide with dimensions a=2 cm and b=1cm. The

waveguide is filled with air and the operating frequency is 50MHz. Find the

propagation constant, guide wavelength and cut off frequency for TE10,

TM11 and TE20 modes.

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