Time Left - 10:00 mins
ESE EE : Electrical Machines Champion Quiz 5
Attempt now to get your rank among 846 students!
Question 1
If the voltage applied to a transformer primary is increased keeping the V/f ratio fixed, the magnetizing current and the core loss will respectively :
Question 2
If the iron core of a transformer is replaced by an air core, then the hysteresis losses in the transformer will
Question 3
In a normal operation of 400 V, 50 Hz transformer, the total iron loss is 2500 W. when the supply voltage and frequency are reduce to 200 V and 25Hz respectively, the corresponding loss is 850W. The eddy-current loss at normal voltage
Question 4
Statement (I): The core-loss in a transformer in independent of the load current.
Statement (II): The core is made up of thin laminations interleaved at the joints to avoid air gaps.
Statement (II): The core is made up of thin laminations interleaved at the joints to avoid air gaps.
Question 5
Statement (I) : Size of power transformer is inversely proportional to the operation frequency.
Statement (II): Copper loss is proportional to frequency.
Question 6
What is the core loss in a high frequency ferrite core transformer used in SMPS power supply?
Question 7
What does the SCR (short circuit ratio) of a synchronous machine yield?
Question 8
Which one of the following is the correct statement?
Question 9
Assertion (A): AC armature windings are short chorded by selecting value of coil span more than the pole pitch.
Reason (R): Short chording is done to eliminate harmonics in the induced e.m.f.
Reason (R): Short chording is done to eliminate harmonics in the induced e.m.f.
Question 10
If the excitation of a 3-phase alternator operating on infinite bus bars is changed, which one of the following shall alter?
- 846 attempts
- 2 upvotes
- 32 comments
Jun 22ESE & GATE EE
