20E2E22-EMD EV-SQ2

In regenerative braking of electric vehicles, the energy is ________.

• stored in battery

• dissipated as heat

• returned to energy source

• converted to mechanical energy

Permanent Magnet machines can achieve speed control by varying the  _______.

• armature resistance

• field current

• supply voltage

• rotor inertia
  
  

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

• plugging

• regenerative

• dynamic

• reverse current

The ____________ speed control technique is not applicable for Synchronous Reluctance motor.

• open loop

• closed loop

• pole changing

• field weakening

In DC motors, the flux control method is otherwise known as _________.

• constant torque drive method

• constant power drive method

• constant voltage drive method

• constant current drive method

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

• only squirrel induction motors

• only slip ring induction motor

• 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

The effect of armature reaction is more in ________ method.

• tapped field control

• armature resistance control

• field weakening control

• voltage control method

A Switched Reluctance motor can produce torque at a speed  __________.

• equal to synchronous speed

• less than synchronous speed

• double than synchronous speed

• triple than synchronous speed

Increasing the stator poles _________ the speed of reluctance motor.

• increases

• decreases

• remains the same

• nullifies