Engineering :: Fluid Mechanics and Hydraulic Machines
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311. |
The disadvantage of burried penstocks is |
A. |
Protection against effect of temperature because of soil cover |
B. |
Protection against freezing of conveyed water |
C. |
Protection against earthquake shock |
D. |
Immunity against rock sides, avalanches and falling tree |
E. |
Difficulty in repair and maintenance |
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Answer: Option E
Explanation:
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312. |
The advantage of exposed penstock is |
A. |
Safety against sliding |
B. |
Full exposure to external variation in temperature |
C. |
Expansion joints necessary |
D. |
Changes of water conveyed being frozen in severe cold climates |
E. |
Longitudinal stresses may develop owing to anchorages |
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Answer: Option A
Explanation:
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313. |
Anchor blocks are provided to hold the pipe line so as to |
A. |
Prevent the pipe line sliding down the hill |
B. |
Control the direction of expansion |
C. |
Resist the unbalanced hydrostatic forces at a change of direction of the pipe line |
D. |
Prevent movement of the pipe line on account of vibration or water hammer pressures |
E. |
All of the above |
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Answer: Option E
Explanation:
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314. |
In which contact condition case the value of coefficient of friction is expected to be highest? |
A. |
Steel on concrete |
B. |
Steel on steel |
C. |
Steel on steel, greased plates |
D. |
Packing and liner |
E. |
Steel on steel with two layers of graphite service in between |
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Answer: Option A
Explanation:
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315. |
Highest value of sliding factor may be expected in case of |
A. |
Concrete on sand |
B. |
Concrete on rock |
C. |
Concrete on clayey soil |
D. |
Concrete on gravel |
E. |
Concrete on fine gravel |
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Answer: Option B
Explanation:
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316. |
The maximum continuous power available from a hydro-electric plant under the most adverse hydraulic conditions is known as |
A. |
Base power |
B. |
Firm power |
C. |
Primary power |
D. |
Secondary power |
E. |
Installed capacity |
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Answer: Option B
Explanation:
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317. |
A plot between power generated in MW and time is known as |
A. |
Load curve |
B. |
Load duration curve |
C. |
Load factor |
D. |
Demand curve |
E. |
None of the above |
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Answer: Option A
Explanation:
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318. |
The ratio of maximum load to the rated plant capacity is known as |
A. |
Load factor |
B. |
Utilization factor |
C. |
Maximum load factor |
D. |
Capacity factor |
E. |
Plant factor |
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Answer: Option B
Explanation:
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319. |
Portion of the installed reserve kept in operable condition but not placed in service to supply the peak load is known as |
A. |
Operating reserve |
B. |
Spinning reserve |
C. |
Cold reserve |
D. |
Hot reserve |
E. |
None-spinning reserve |
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Answer: Option C
Explanation:
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320. |
Capacity of a hydro-electric plant in service in excess of the peak load is known as |
A. |
Operating reserve |
B. |
Spinning reserve |
C. |
Cold reserve |
D. |
Hot reserve |
E. |
Peak reserve |
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Answer: Option A
Explanation:
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