20EE2E55-EMD-SQ2

The purpose of a transformer in a DC drive system is to ____________

• isolates the motor from the power source

• step up or down the voltage

• provides a path for the armature current

• control the speed of the motor

The smoothing reactor in uncontrolled rectifier control is to ___________

• reduces the torque ripple

• improves the power factor

• increases the speed range

• protects the motor from overcurrent

In __________ braking method, the armature of DC motor is disconnected from the supply.

• plugging

• regenerative

• dynamic

• reverse current

______________ mode is obtained using Type-A chopper.

• Forward braking

• Reverse braking

• Forward motoring

• Reverse motoring

Motors with  _________duty is used in paper mill drives.

• intermittent periodic

• intermittent periodic with starting

• short time

• continuous

The consequent pole method is used for controlling the speed of __________

• only squirrel cage type motors

• only slip ring induction motor

• for both squirrel cage and slip ring induction motor

• synchronous motor

When two mechanically coupled 4 and 6 pole slip ring Induction motors are operated on 50 Hz supply, the possible synchronous speeds in rpm are __________.

• 600,750,

  1000,1500

• 600,1000,

  1500,3000

• 500,600,

  1000,1500

• 750,1000,

  1500,3000

____________ feeds power to load with four quadrant operation.

• Rectifier

• Inverter

• Cycloconverter

• AC Voltage Controller

In Current Source Inverter, ______ is  independent of the load.

• input voltage

• input current

• output voltage

• output current

Closed loop control of induction motor consists of outer _______ loop and inner ______ loop.

• current control, speed

• speed, current control

• speed, voltage control

• voltage control, speed