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WorksheetsElectrical Drives - Assignment 1
Total questions: 20
Worksheet time: 20mins
Stator voltage control for the speed control of induction motor is suitable for......
Fan and Pump Drive
Drive of a crane
Running as the generator
Constant Load drive
________ duty cycle consist of frequent on load and off-load period.
Continuous Duty with constant Load
Continuous Duty With the variable load
Short Time duty
Intermittent duty
Which type of drive can be used for Textile Industry?
DC Motor
Squirrel cage Induction Motor
Cumulative Compound Motor
Synchronous Motor
__________ drive is also called as Line shaft drive
Individual drive
Multimotor drive
Group Drive
None of the above
For a three phase induction motor, which of the following techniques not used?
Frequency control
stator voltage control
Rotor voltage control
Moisture control
Type-A chopper is used for obtaining which type of mode?
Reverse motoring mode
Motoring mode
Reverse regenerative braking mode
Regenerative braking mode
What is the condition for the steady-state operation of the motor?
Load torque > Motor torque
Load torque <<<< Motor torque
Load torque = Motor torque
Load torque < Motor torque
In case of variable frequency system __________ is varied
T
Ton
Toff
supply frequency
In rotor resistance control method, with the increase in speed.
torque increases
torque decreases
slip increases
losses increase
In current source inverters
L filter is used after the CSI (load side
L filter is used before the CSI (input side)
C filter is used after the CSI (load side)
C filter is used before the CSI (input side)
Which of the following component of electric drive is a component that supplies sufficient power to the drive systems?
Controller
Sensor
Load
Motor
How many components do an electric drive consists of ___ ?
3
4
5
6
Temperature rise time curve is a......
Straight line
Parabola
Exponential curve
Hyperbola
On what factors is the rated voltage selected for an induction motor?
Motor rating
Starting current
Fault levels of supply
All of these
Which braking method is the best method for obtaining high braking torque?
Regenerative braking
Plugging
Dynamic braking
Rheostatic braking
The armature voltage control of a DC motor will provide....
Constant power drive
Constant current drive
Constant voltage drive
Constant torque drive
Field weakening control method is used for the speed....
above to rated speed
below rated speed
equal to rated speed
can't tell
The concept of v/f control inverters driving induction motors results in....
constant torque operation
speed reversal
reduced magnetic losses
harmonic elimination
Slip power recovery scheme is used in....
DC motor speed control
Induction motor speed control
Synchronous motor speed control
Alternator speed control
Torque to friction and windages are classified under..... torque
active
passive
both (a) and (b)
none of the above
