When a hydraulic turbine in operated, it is found that it has a high design efficiency and this efficiency remains constant over a wide range of regulation from the design condition. What is the type of this turbine ?
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Solution
Kaplan turbine
Match List I and List II.
List I List II
A.Existence of stream function 1.Irrotationality of flow
B.Existence of velocity 2.Continuity of flow potential
C.Absence of temporal 3.Uniform flowvariations
D.Constant velocity 4.Steady flowvector
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Solution
Irrotationality of flow ⇒ Existence of velocity potential
Continuity of flow ⇒ Existence of stream function
Uniform flow ⇒ Constant velocity vector
Steady flow ⇒ Absence of temporal variations
The parameters that determine the friction for turbulent flow in a rough pipe are :
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Solution
Parameters that determine the friction for turbulent flow in a rough pipe are Reynolds number and relative roughness.
A series combination of two Carnot’s engines operate between the temperatures of 180°C and 20°C. If the engines produce equal amount of work, then intermediats temperaturs will be ________
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Solution
As given, two Carnot engines are in series and produce equal amount of work i.e. (w1= w2)
Then intermediate temperature = \(\frac{180+20}{2}\) = 100°C
A control volume is
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Solution
A control volume is a fixed region in space specified for the analysis of mass and energy balances for flowing systems thermodynamically. The control volume boundary may be real or imaginary.
A component’s critical element is subjected to bi-axial stresses whose values are 450 MPa and 250 MPa. The maximum working stress will be _________
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Solution
For a given material, the modulus of rigidity is 100 GPa and Poisson’s ratio is 0.27. The value of modulus of elasticity is _________
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Solution
As we know that,
Modulus of Elasticity (E) = 2G (1 + µ)
= 2 × 100 (1 + 0.27)
= 2 × 100 (1.27)
= 254 GPa
Which of the following mechanisms produces intermittent rotary motion from continuous rotary motion.
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Solution
Geneva mechanism is used to produce intermittent rotary motion from continuous rotary motion.
Principal strains at a point are + 90 × 10–6 and – 90 × 10–6,the maximum shear strain at the point is _______
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Solution
As we know that,Maximum shear strain (Vmax.) = ε1 -ε2
= 90 × 10–6 – (– 90 × – 10–6) = 180 × 10–6
D’Alembert’s Principle states that the system of external forces acting on a body in motion will be in dynamic equilibrium with :
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Solution
D’Alembert’s principle states that the system of external forces acting on the body in motion will be in dynamic equalibrium with the inertia force of the body.