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Worksheets20EE2001 - Class Test Revision 1
Total questions: 12
Worksheet time: 4mins
The Hall sensor in BLDC motor is placed after every _______
120°
90°
180°
360°
The following diagram shows most popular three-wheel electric vehicles is the
Twike
MES-DESSA
Honda Insight
GM’s ‘Hy-wire
Normally a ___ quadrant electronic controller is used to control the motor.
four
three
two
single
The mass of an electric vehicle has a ____ effect on the performance, range and cost of an electric vehicle
critical
low
medium
insignificant
The rolling drag is independed of _____
speed
motor current
torque
motor voltage
The concept of V/f control of inverters driving induction motors results in ____
constant torque operation
speed reversal
reduced magnetic loss
harmonic elimination
The reluctance motor operates at a power factor of _____.
0.8
1
0.9
0.6
Typical brushless motor doesn’t have Commutator
True
False
During regenerative braking the motor operates as a transformer.
True
False
If the vehicle brakes, this energy is converted to heat.
True
False
The ratio of electric motor power to the sum of electric motor power and IC engine power is defined as
degree of hybridization
decrease of hybridization
degree of hibernation
Lithium polymer batteries are cheaper than Lithium-Ion batteries
False
True
