MCQ -Electric Vehicle and Power Management
* Indicates required question
Changing the terminal voltage in induction motor ____________. *
2 points
The switched reluctance motor (SRM) is *
2 points
The dynamic performance of the machine improves significantly using *
2 points
_______________ is not possible in ___________because of the trapezoidal shape of back-emfs *
2 points
The objective of vector control or field orientation is to make the induction motor emulate the separately excited DC motor *
2 points
Vector control refers to the control of magnitude and phase angles of the stator and rotor critical components. *
2 points
The term vector control is general and is also used for controls where the angle between the rotor and stator critical components is some thing other than _____. *
2 points
In direct vector control methods, the rotor flux angle is calculated from indirect measurements of machine electrical quantities *
2 points
In the __________ control scheme, which is more commonly used, a rotor position sensor is used to derive the speed and rotor position information, and the slip relation of  is used to derive the rotor flux angle *
2 points
Vector control is used for the __________ in EV and HEV applications to deliver required performance. *
2 points
First-generation controllers of induction motor drives used in EVs employed__________ using a table of slip vs. torque *
2 points
The speed of an induction motor can be controlled in _________ *
2 points
The performance of constant V/Hz control  drive for vehicle applications is poor, because it is based on a steady state equivalent circuit of the machine *
2 points
High-power density and a potentially low production cost of_______make them ideally suited for EV applications *
2 points
The acoustic noise problem has so far been a deterrent for the use of switched reluctance machines in EVs *
2 points
The SR motors have field windings on the rotor, which helps increase the torque and inertia rating of these motors *
1 point
switched reluctance machines work on the _________ principle. *
1 point
In SRM, the double saliency construction and the discrete nature of torque production by the independent phases lead to higher torque ripple compared to other machines *
1 point
The DC drives for EV and HEV applications are the DC-DC converters, such as ___________ *
1 point
The batteries are made of unit cells containing the ______that is convertible to__________. *
1 point
Batteries do allow a slow discharge, due to diffusion effects, which is why they are not particularly good for long-term energy storage. *
1 point
The components of the battery cell are *
1 point
Batteries that cannot be recharged and are designed for a single discharge are known as __________. *
1 point
Lithium batteries used in watches, calculators, cameras, etc., and the manganese dioxide batteries used to power toys, radios, torches, etc belong to __________ *
1 point
The batteries needed and used for EVs and HEVs are____ *
1 point
The major types of rechargeable batteries considered for EV and HEV applications are: *
1 point
The Zinc-air type of battery has the longest development history of all battery technology, particularly for their need and heavy use in industrial EVs, such as for golf carts in sports, passenger cars in airports, and forklifts in storage facilities and supermarkets *
1 point
____________ batteries are examples of alkaline batteries *
1 point
Lead-acid batteries can be designed to be high powered and are inexpensive, safe, and reliable *
1 point
________evolved out of the development of solid state electrolytes *
1 point
Zinc-air batteries have a gaseous positive electrode of oxygen and a sacrificial negative electrode of metallic zinc. *
1 point
_________ are commonly known as ZEBRA batteries *
1 point
The amount of free charge generated by the active material at the negative electrode and consumed by the positive electrode is called the *
1 point
The discharge rate is the current at which a battery is discharged. The rate is expressed as Q/h rate *
1 point
The ________ is the present capacity of the battery *
1 point
The state of discharge (SoD) is a measure of the charge that has been drawn from a battery *
1 point
The practical capacity QP of a battery is always much lower compared to the theoretical capacity QT, due to practical limitations. *
1 point
The energy of a battery is measured in terms of ______  and_____________ *
1 point
In lead-acid and other batteries, there is a decrease in charge capacity (excluding voltage effects) with increasing currents. This is often referred to as the _________ *
1 point
A chopper may be thought as a____________ *
1 point
Which device can be used in a chopper circuit? *
1 point
The capacity of a battery is expressed in terms of *
1 point
Trickle charger of a storage battery helps to ____ *
1 point
 On over charging a battery______ *
1 point
Fast charging -DC suppy Normal charging - single phase supply *
1 point
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