Virtual Labs

Coefficient of discharge of given Venturi meter

1. Relation of length of converging cone of Venturi meter, where D is diameter of inlet and d is diameter of throat is:

a: 2(D-d) Explanation

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b: 2Dd Explanation

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c: 2.7(D-d) Explanation

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d: 2(D-d)D Explanation

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2. If specific gravity of a liquid is 0.78 and manometer head is 20 cm. Find the difference of pressure head. (Specific gravity of Hg = 13.6)

a: 3.28 m Explanation

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b: 4.28 m Explanation

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c: 2.82 m Explanation

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d: 3.78 m Explanation

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3. Bernoulli equation is summation of pressure head, velocity head and datum head.

a: True Explanation

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b: False Explanation

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4. For Venturi meter, the coefficient of discharge range is:

a: Greater than 0.90 Explanation

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b: Between 0.8 and 0.9 Explanation

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c: Between 0.7 and 0.8 Explanation

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d: Less than 0.7 Explanation

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5. The coefficient of discharge of a Venturi meter generally .

a: increases with increase in Reynolds number Explanation

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b: decreases with decrease in Reynolds number Explanation

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c: increases up to certain value of Reynold’s number and then becomes constant Explanation

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d: does not vary with Reynolds number Explanation

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6. The divergent portion of a Venturi meter is made longer than convergent portion to prevent:

a: Frictional losses Explanation

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b: Flow separation Explanation

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c: Velocity increase Explanation

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d: Energy loss Explanation

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7. The pressure is maximum at in a venturi meter.

a: inlet Explanation

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b: midpoint of convergent part Explanation

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c: midpoint of throat Explanation

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d: midpoint of diverging part Explanation

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8. Angle of divergent part of Venturi meter is than that of convergent part.

a: Less Explanation

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b: Greater Explanation

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c: Equal Explanation

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d: None of the above Explanation

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9. Discharge co-efficient (C_d) is defined as:

a: Q_act - Q_theoretical Explanation

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b: Q_act + Q_theoretical Explanation

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c: Q_act / Q_theoretical Explanation

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d: Q_act X Q_theoretical Explanation

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10. The velocity of liquid at throat is than that of inlet in venturi meter.

a: less Explanation

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b: equal Explanation

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c: greater Explanation

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d: None of these Explanation

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