My Report

Electrical Machines Practice Test 8


Correct Answer: 2 points | Wrong: -1 point
Grades: A* (100% score) | A (80%-99%) | B (60%-80%) | C (40%-60%) | D (0%-40%)
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1. When an induction generator is connected to an infinite bus, it _________

2. Introducing the external resistance increases _________

(i) speed
(ii) output power
(iii) starting torque

3. The power slip characteristic is given as?

4. Use the below circle diagram to choose the correct option.
electrical-machines-questions-answers-circle-diagrams-induction-machines-q8

5. If the reactance of the 3-phase slip ring induction motor is increased then the torque-slip characteristic varies as?

6. As per the condition given, if a 3-phase squirrel-cage induction motor is operating at a slip of -0.05 then machine will?

7. A 3-phase induction motor had the maximum rated torque of 40 N-m while the load torque applied to it is 55 N-m.

8. A 3-phase induction motor is fed at the stator at a frequency f. If the rotor speed is Nr and synchronous speed is Ns, then the absolute speed of the resultant flux in space is?

9. Starters are required in the induction motor because __________

10. No load power factor of the induction motor will __________ if the no load test is conducted at its rated frequency but less than the rated voltage.


 

Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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