Questions and answers for exam Preparation

MCQs

Total Questions : 192 | Page 15 of 20 pages

Question 141. Which of the following have large power (>50MW) and storage capacities (>100MWh)?

Memory effect
Battery energy storage (BES) and flow battery energy storage
Super capacitor energy storage and flywheel energy storage
Pumped hydro-electric storage and underground pumped hydro-electric storage

Discuss Question

Answer: Option D. -> Pumped hydro-electric storage and underground pumped hydro-electric storage
Answer: (d).Pumped hydro-electric storage and underground pumped hydro-electric storage

Question 142. What is a major disadvantage with pumped hydro-electric system?

No dependence on geographical locations
Small scale construction for effective functioning
Low initial costs of construction
Depends on specific geographical locations for the construction of the two reservoirs

Discuss Question

Answer: Option D. -> Depends on specific geographical locations for the construction of the two reservoirs
Answer: (d).Depends on specific geographical locations for the construction of the two reservoirs

Question 143. Which of the following is an application of pumped hydro-electric storage?

Energy source
Frequency regulation only in pumping mode
Frequency regulation in both pumping and generation modes
Absorbs power to increase the net expenses

Discuss Question

Answer: Option C. -> Frequency regulation in both pumping and generation modes
Answer: (c).Frequency regulation in both pumping and generation modes

Question 144. Efficiency of pumped hydro-electric storage is in the range of _________

50% — 80%
80% — 120%
10% — 20%
45% — 50%

Discuss Question

Answer: Option A. -> 50% — 80%
Answer: (a).50% — 80%

Question 145. How does pumped hydro-electric storage work?

Pumps water from higher level to a lower level
Pumps water from lower level to higher level
Uses electrical energy present in the water
Uses nuclear energy present in the water molecules

Discuss Question

Answer: Option B. -> Pumps water from lower level to higher level
Answer: (b).Pumps water from lower level to higher level

Question 146. Turbine blades use a/an _______ design.

bulky
airfoil
teardrop
train’s

Discuss Question

Answer: Option B. -> airfoil
Answer: (b).airfoil

Question 147. What does tip speed ratio (TSR) depend on?

Motor material
Wind tower material
Rotor blade shape profile
Different types of gases

Discuss Question

Answer: Option C. -> Rotor blade shape profile
Answer: (c).Rotor blade shape profile

Question 148. What is tip speed ratio (TSR)?

Ratio of wind speed to the speed of rotor
Ratio of the speed of rotor tip to wind speed
Ratio of wind speed to the speed of rotor tip
Ratio of wind speed to the speed of the blade’s center

Discuss Question

Answer: Option B. -> Ratio of the speed of rotor tip to wind speed
Answer: (b).Ratio of the speed of rotor tip to wind speed

Question 149. Why is it necessary to have an optimal tip speed ratio (TSR)?

To ensure maximum efficiency
To ensure good aerodynamics
To increase drag
To ensure minimum efficiency but good aerodynamics

Discuss Question

Answer: Option A. -> To ensure maximum efficiency
Answer: (a).To ensure maximum efficiency

Question 150. Which of the following is the governing equation for power extraction and calculation? Note that all the quantities on the right side of equation denotes a vector quantity.