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Doctors Medicines MCQs Q&A

  1. PMMC rotor
  2. Slip ring rotor
  3. DC rotor
  4. BLDC rotor
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1 Answers

Option 2 : Slip ring rotor

Almost 90% of the induction motors are squirrel cage type because they have the simplest and most rugged construction.

The differences between the slip ring and squirrel cage induction motor are given below:

Slip ring induction motor

Squirrel cage induction motor

It has a slip ring type rotor

It has a squirrel cage type rotor

Cylindrical laminated core with parallel slots and each slot consist one bar

The slots of the rotor are not parallel but are skewed

Construction is complicated

Construction is simple

We can add external resistance to the rotor

The rotor bar is permanently shorted at the end of the ring; thus, it is not possible to add any external resistance

The rotor resistance starter can be used

Rotor resistance starter cannot be used

Starting torque is high

Starting torque is low

Brushes are present

Brushes are absent

Frequent maintenance is required

Less maintenance required

Power factor is low

Power factor is high

Speed control is possible

Speed control is not possible
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Related Questions

Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is . Three semaphores empty, full and mutex are defined with respective initial values of 0, and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do {         wait (P) ;         wait (mutex) ;         //Add item to buffer         signal (mutex) ;         signal (Q) ; } while (1) ; do {          wait (R) ;          wait (mutex) ;          //Consume item from buffer          signal (mutex) ;          signal (S) ; } while (1) ;   Which one of the following assignments to P, Q, R and S will yield the correct solution?
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