Business Management

Author: Haroon Khalil

  • Velocity Ratio

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    Haroon Khalil
    in

    Velocity ratio is the ratio of speed of the driven pulley to that of the driving pulley. Let   N1 is rotational speed of the driving pulley          N2 is rotational speed of the driven pulley          D1 is diameter of driving pulley          D2 is diameter of driven pulley          t is thickness of the belt i.e., D1N1 = D2D2, where t is very small in comparison to D, therefore it…

  • Type of Belt Cross-sections

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    Haroon Khalil
    in

    Figure 15.2 shows flat belt and V-belt. In the flat belt drive, rim of pulley is slightly crowned which helps to keep the belt running centrally on the pulley rim as shown in Figure 15.2(a). For the V-belt drive, grooves are made on rim of pulley for wedging action. The belt does not touch the bottom of the…

  • BELT DRIVE

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    Haroon Khalil
    in

    In belt drive, the velocity of two shafts can be varied by variation in diameter of pulley on which belt is mounted. But in chain or gear drive, the velocity of two shafts is varied by variation in the number of teeth on sprocket and gear, respectively. If an unstretched belt is mounted on the…

  • INTRODUCTION

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    Haroon Khalil
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    Power transmission is a process to transmit motion from one shaft to another by using some connection between them like belt, rope, chain, and gears. To connect the shafts, mainly two types of connectors are used, one is flexible and other is rigid. In flexible types of connection, there is relative velocity between shaft and…

  • DIFFERENCES BETWEEN FLYWHEEL AND GOVERNORS

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    Haroon Khalil
    in

    The difference between flywheel and governors is given in Table 14.1   Table 14.1 Differences Between Flywheel and Governors Flywheel Governors It is provided on the engine and fabricating machines, viz., rolling mills, punching machines, shear machines, presses, etc.Its function is to store available mechanical energy when it is in excess of the load requirements and to…

  • Hit and Miss Governing

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    Haroon Khalil
    in

    This method is used for smaller gas engines. In this system, whenever the engine starts running at higher speed, some explosions are missed or omitted. This is done with the help of governor in which the inlet valve of fuel is closed and the explosions are omitted till the engine speed reaches its normal value.…

  • Quantitative Governing

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    Haroon Khalil
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    In this system, quality of charge remains constant but quantity of air–fuel mixture supplied to the engine is varied by means of centrifugal governors. Centrifugal governor regulates the throttle valve; whenever the engine starts running at higher speed due to decreasing load, the quantity of charge is reduced till the engine speed reaches to its…

  • Qualitative Governing

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    Haroon Khalil
    in

    In this method, the amount of fuel entering the cylinder is varied by altering the stroke of the oil pump or by passing a part of fuel which would have otherwise been injected into the engine cylinder back to the oil tank or by delaying the closing of the suction valve in the fuel pump…

  • GOVERNING OF IC ENGINES

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    Haroon Khalil
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    Governing is an action to control the fuel supply so that the engine runs at practically constant speed. When load on an engine increases the speed drops and when load decreases the speed increases. Thus to control the fluctuation in engine speed, fuel requirement increases during increasing load and fuel requirement decreases during decreasing load.…

  • SENSITIVENESS OF GOVERNORS

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    Haroon Khalil
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    A governor is said to be sensitive, if change of speeds from no load to full load may be as small a fraction of the mean equilibrium speed as possible and the corresponding sleeve lift may be as large as possible. Sensitiveness of a governor can be found by dividing the difference between maximum and…