Virtual Labs

“1.” Undercut is provided on buckets to:

a: To reduce weight of the buckets Explanation

Explanation

b: To reduce size of the buckets Explanation

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c: To avoid interference of water jet with incoming buckets Explanation

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d: To increase the velocity Explanation

Explanation

“2.” Splitter on buckets is used:

a: To reduce impact force on the bucket Explanation

Explanation

b: To strength the bucket Explanation

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c: To split water jet into two and change its direction Explanation

Explanation

d: To enhance impact force on the bucket Explanation

Explanation

“3.” Most widely used turbine for electricity generation is:

a: Pelton Explanation

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b: Kaplan Explanation

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c: Francis Explanation

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d: All are equally used Explanation

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“4.” Governor in Pelton Turbine is used:

a: To improve efficiency Explanation

Explanation

b: To maintain constant RPM Explanation

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c: To provide emergency shutdown Explanation

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d: To control the electricity generation Explanation

Explanation

“5.” A Pelton wheel is to be designed with a wheel pitch dia. of 1 m and jet dia. of 0.1 m. the number of buckets required:

a: 25 Explanation

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b: 20 Explanation

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c: 15 Explanation

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d: 10 Explanation

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“6.” Which component is not used in Pelton wheel turbine?

a: Jet Explanation

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b: Penstock Explanation

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c: Draft tube Explanation

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d: Casing Explanation

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“7.” The hydraulic efficiency of Pelton turbine will be maximum when blade velocity is equal to .

a: V/2 Explanation

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b: V/3 Explanation

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c: V/4 Explanation

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d: V/5 Explanation

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“8.” In Pelton turbine, is defined as ratio between power delivered to runner and power supplied at inlet of turbine.

a: mechanical efficiency Explanation

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b: volumetric efficiency Explanation

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c: hydraulic efficiency Explanation

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d: overall efficiency Explanation

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“9.” Among the following which turbine has least efficiency?

a: Pelton turbine Explanation

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b: Kaplan turbine Explanation

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c: Francis turbine Explanation

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d: Propeller turbine Explanation

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“10.” The power supplied at inlet of turbine in SI units is known as:

a: Shaft power Explanation

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b: Runner power Explanation

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c: Water power Explanation

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d: Total power Explanation

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Characteristic curves of Pelton wheel