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ASSESSMENT ENERGY EFFICIENCY (HYDRO)

Total questions: 13

Worksheet time: 7mins

Name
Class
Date
1.
1. The power output from a hydro-electric power plant depends on three parameters........
a)
Head, type and dam of discharge
b)
Head, discharge and efficiency of the system
c)
Efficiency of the system, type of draft tube and type of turbine used
d)
Type of dam, discharge and type of catchment area
2.
2. _______________ is the speed of geometrically similar turbine which would produce unit power (1kW) under unit head (1m).
a)
Relative speed
b)
Specific speed
c)
Absolute speed
d)
Turbine speed
3.
3. Francis and Kaplan turbine is used for _______ heads hydro-electric plant.
a)
Medium and low head
b)
High head
c)
Low head
d)
Low and high head
4.
4. What is 'live storage’?
a)
Storage capacity below the lowest level of reservoir, which is not susceptible to release by usual outlet means
b)
Storage capacity below Min Operating Level(MOL)
c)
Storage capacity between Min Operating Level(MOL) and Full Supply Level(FSL)
d)
Storage for flood control
5.
5. Which one does NOT affect turbine efficiency losses?
a)
Cooling system inefficient
b)
Guide vane seal leakage
c)
Wicket gate/guide vane/nozzle misalignment
d)
Runner cavitation
6.

6. Two types/category of hydro turbines:

i) Pelton

ii) Impulse

iii) Vertical Francis

iv) Reaction

a)

i & ii

b)

i & iii

c)

ii & iii

d)

ii & iv

7.

8. Trashrack losses due to :

i) Trash accumulation

ii) Flow blockage infront

iii) Frame deformation

iv) Rusty

a)

i,ii & iii

b)

i,iii & iv

c)

ii,iii & iv

d)

All of the above

8.
9. Francis, Kaplan and Propeller turbines fall under the category of __________.
a)
Impulse turbine
b)
Reaction turbine
c)
Impulse reaction combined
d)
Axial flow
9.

What is the component used to regulate the excess water / inflows at the dam?

a)

Saddle dam

b)

Penstock

c)

Spillway / flood gate

d)

Log boom

10.

What are the factors that will effected the operational regime of the hydropower?

i.Weather

ii.System frequency

iii.Gas supply / curtailment

iv.Peak demand

a)

i & ii

b)

ii, iii, & iv

c)

iii & iv

d)

All of the above

11.

The upstream and the downstream part of the dam are called

a)

Forebay & tailrace

b)

High side & low side

c)

Inflow & outflow

d)

Reservoir & riverflow

12.

Which of the following are not in the variable in the overall efficiency calculation?

i.Discharge rate, m3/s

ii.Force, kgs-1

iii.Water density, kg/m3

iv.Momentum, kgm/s

a)

i & iii

b)

ii & iv

c)

i, ii, & iii

d)

ii, iii, & iv

13.

Which of the following are the identified root causes for the turbine losses in hydro efficiency? 

i.Degradation of electrical parts

ii.Algae

iii.Wicket gate mis-align 

iv.Runner cavitation

a)

i & iii

b)

ii & iii

c)

iii & iv

d)

All of the above