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SSC Junior Engineer 2016

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  • subar said:

    The area below the p–V diagram of a non-flow process represents SSC JE 2015 MECHANICAL
    (a) heat transfer (b) mass transfer
    (c) work transfer (d) entropy transfer

    (c) work transfer


    to plot the changes in the state of a gas during a thermodynamic process. On the figure we show two types of plots that are used to describe changes of state. On the left we have plotted the pressure versus the volume, which is called a p-V diagram. On a p-V diagram, lines of constant temperature curve from the upper left to the lower right. A process performed at constant temperature is called an isothermal process. During an adiabatic process no heat is transferred to the gas, but the temperature, pressure, and volume of the gas change as shown by the dashed line. As described on the work slide, the area under a process curve on a p-V diagram is equal to the work performed by a gas during the process. On the right of the figure we have plotted the temperature versus the entropy of the gas. This plot is called a T-s diagram. Lines of constant pressure curve from the lower left to upper right on a T-s diagram. A constant pressure process is called an isobaric process and this type of process occurs in the combustor of a gas turbine engine. During an isentropic process there is no change in the entropy of the system and the process is reversible. An isentropic process appears as a vertical line on a T-s diagram. The area under a process curve on a T-s diagram is related to the amount of heat transferred to the gas.
  • In an isothermal process, the heat transfer is SSC JE 2015 MECHANICAL
    (a) less than the work transfer
    (b) equal to the work transfer
    (c) less than or equal to the work transfer
    (d) more than the work transfer
  • Katyal said:

    In an isothermal process, the heat transfer is SSC JE 2015 MECHANICAL
    (a) less than the work transfer
    (b) equal to the work transfer
    (c) less than or equal to the work transfer
    (d) more than the work transfer

    (b) equal to the work transfer

    A process which occurs at constant temperature is called isothermal.

  • A Manometer is used to measure SSC JE 2015 MECHANICAL
    (a) Discharge (b) Pressure
    (c) Volume (d) Temperature
  • Katyal said:

    A Manometer is used to measure SSC JE 2015 MECHANICAL
    (a) Discharge (b) Pressure
    (c) Volume (d) Temperature


    (b) Pressure


    Manometers are devices in which columns of a suitable liquid are used to measure the difference in pressure between two points or between a certain point and the atmosphere. Manometer is needed for measuring large gauge pressures. It is basically the modified form of the piezometric tube

  • Orifice meter is used for measurement of SSC JE 2015 MECHANICAL
    (a) Temperature (b) Pressure
    (c) Rate of flow (d) Viscosity
  • Katyal said:

    Orifice meter is used for measurement of SSC JE 2015 MECHANICAL
    (a) Temperature (b) Pressure
    (c) Rate of flow (d) Viscosity

    (c) Rate of flow

    An orifice plate is a device used for measuring flow rate, for reducing pressure or for restricting flow (in the latter two cases it is often called a restriction plate ). Either a volumetric or mass flow rate may be determined, depending on the calculation associated with the orifice plate.

  • A structural member subjected to an axial compressive SSC JE 2015 MECHANICAL
    force is called
    (a) beam (b) Column
    (c) frame (d) strut
  • Katyal said:

    A structural member subjected to an axial compressive SSC JE 2015 MECHANICAL
    force is called
    (a) beam (b) Column
    (c) frame (d) strut

    (b) Column

    A structural member loaded axially in compression is generally called a compression member. Vertical compression members in buildings are called columns, posts or stanchions. A compression member in roof trusses is called struts and in a crane is called a boom.
  • Why are gear teeth made harder? SSC JE 2015 MECHANICAL
    (a) To avoid wear (b) To avoid pitting
    (c) To avoid abrasion (d) To avoid tensile strength
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