WorksheetsPERES UNit 4
Total questions: 30
Worksheet time: 30mins
A 20Ah battery has a C rate of 2. What is the discharge current?
20A
10A
5A
None of the above
DoD for a battery stands for
Daddy o Daddy
Department of Defense
Depth of discharge
None of above
A 50Ah battery, rated for 12V has an allowable DoD of 50%. How much energy can be transferred to the load?
300Wh
600Wh
1200Wh
None of the above
The battery design for an application does not depend on
Voltage and current
Charge/DIscharge duration
Cost, Size, Weight
None of the above
The electrical design of a solar array does not depend on
Sun intensity
Sun angle
Load matching for maximum power
None of the above
If 'P' is the PV cell current with normal sun (reference), and θ is the angle of the sun line measured from the normal, cell output current is given by
PSinθ
PCosθ
Ptanθ
None of the above
A PV string refers to several PV cells connected
In Parallel
In Series
One below the other
None of the above
PV cells in a string which get shadowed
Produce more output power
Act as load and get heated up
Both option 1 and 2
None of the above
To eliminate loss of power due to shadowing,
Strings are divided in to segments
Bypass diodes are provided for each segment
both option 1 and 2
Each PV cell is connected to an inverter
For a PV cell, wIth increasing temperature, the
Open circuit voltage decreases, short circuit current decreases
Open circuit voltage decreases, short circuit current increases
Open circuit voltage increases, short circuit current decreases
Open circuit voltage increases, short circuit current increases
The maximum power output of a PV cell
Increases with temperature and increases with radiation
Increases with temperature and decreases with radiation
Decreases with temperature and increases with radiation
Decreases with temperature and decreases with radiation
For the I-V characteristics of the PV string shown in the figure, the load resistance corresponding to maximum power is given by
R1
R2
R3
None of the above
The Inverter shown in the attached schematic of a PV system corresponds to a
Central inverter
Multiple string Inverter
Module integrated inverter
None of the above
The Inverter shown in the attached schematic corresponds to a
Central inverter
Multi-string inverter
Module-integrated inverter
None of the above
The inverter shown in the attached schematic corresponds to a
Central inverter
Multi-string inverter
Module integrated inverter
None of the above
Loss of energy capture in wind electrical systems due to grid stability is around
0 to 5%
10 to 20%
30 to 40%
50 to 60%
Which of the following is not a requirement for synchronising an incoming supply with grid
Same voltage as grid
Same current as grid
Same power as grid
Same frequency as grid
In a Type A wind energy system, during synchronisation of an incoming supply with grid, there is an inrush current which can be limited by
Adding line resistances
Adding line reactances
Introducing an ac voltage controller
Introducing an auto transformer
Which of the following is not a power quality issue while connecting a wind energy system to the grid?
Voltage magnitude
Voltage flicker
power factor
Waveform at point of coupling
The schematic of wind energy system shown corresponds to
Type A
Type B
Type C
Type D
The schematic shown corresponds to which type of wind energy system?
Type A
Type B
Type C
Type D
The schematic shown corresponds to which type of wind energy system?
Type A
Type B
Type C
Type D
The schematic shown corresponds to which type of wind energy system?
Type A
Type B
Type C
Type D
In the attached schematic which shows the control strategy - operating zone of a wind energy system, what is the y axis parameter?
Voltage
Current
Speed
Power
In the attached schematic, maximum power is extracted for a particular wind speed by varying the
Turbine rotational speed
varying blade length
By raisinng or lowering the naceller
All of the above
Yaw control ensures that the
WInd turbine is never overloaded
Generator current does not exceed limit
Both option 1 and 2
WInd turbine always faces directly in to the wind
Pitch angle control ensures that the
Wind turbine speed is more than cut in speed
Wind turbine blades are set at the best angle to the wind
Both options 1 and 2
None of the above
Which of the following is not an MPPT algorithm?
Perturb and Observe
Fuzzy control
Neural network control
Current limit control
Identify the schematic shown as
Stand-alone PV system
Grid connected PV system
Hybrid system
None of the above
Which of the following is not a function of charge controller?
Extract maximum power from the source
Limit reactive power
Prevent overcharging
Prevent deep discharging
