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Core Subject Knowledge & Technical Concepts Flashcards

7 cards from real GATE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. For an ideal gas undergoing an adiabatic reversible process, which relation holds (γ = Cp/Cv)?

    Answer: Both B and C

    For a reversible adiabatic process, both PV^γ = constant and TV^(γ-1) = constant are valid relations.

  2. The Reynolds number for pipe flow is defined as:

    Answer: ρVD/μ

    Reynolds number Re = ρVD/μ = inertial forces/viscous forces, where D is pipe diameter.

  3. In a simply supported beam with a central point load P and span L, the maximum bending moment is:

    Answer: PL/4

    For a simply supported beam with central point load P, Mmax = PL/4, occurring at mid-span.

  4. Bernoulli's equation is valid for flow that is:

    Answer: Inviscid, incompressible, and steady along a streamline

    Bernoulli's equation assumes inviscid (frictionless), incompressible, steady flow along a streamline.

  5. The Carnot efficiency of a heat engine operating between temperatures TH and TL (in Kelvin) is:

    Answer: 1 - TL/TH

    Carnot efficiency η = 1 - TL/TH, representing the maximum possible efficiency for any heat engine.

  6. In a triaxial state of stress, the von Mises yield criterion is expressed as:

    Answer: (σ1-σ2)² + (σ2-σ3)² + (σ3-σ1)² = 2σy²

    The von Mises criterion states yielding occurs when (σ1-σ2)² + (σ2-σ3)² + (σ3-σ1)² = 2σy².

  7. In a hydraulic turbine, the specific speed is used to:

    Answer: Classify turbines and select appropriate type for given conditions

    Specific speed classifies turbines by shape and is used to select the appropriate turbine type (Pelton, Francis, Kaplan) for given head and flow conditions.