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Test: Fractional KW Motors of Electrical Machines- 1 - Electrical Engineering (EE) MCQ


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10 Questions MCQ Test GATE Electrical Engineering (EE) Mock Test Series 2025 - Test: Fractional KW Motors of Electrical Machines- 1

Test: Fractional KW Motors of Electrical Machines- 1 for Electrical Engineering (EE) 2024 is part of GATE Electrical Engineering (EE) Mock Test Series 2025 preparation. The Test: Fractional KW Motors of Electrical Machines- 1 questions and answers have been prepared according to the Electrical Engineering (EE) exam syllabus.The Test: Fractional KW Motors of Electrical Machines- 1 MCQs are made for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Fractional KW Motors of Electrical Machines- 1 below.
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Test: Fractional KW Motors of Electrical Machines- 1 - Question 1

A 125 W, 4-pole, 110 V, 50 Hz single phase induction motor delivers rated output at a slip of 6%. The total copper loss at full load is 25 Watts. Rotational loss may be assumed to be 25 Watts. Neglecting stator copper loss, the full-load efficiency of the motor would be:

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 1 - Question 1


Total copper loss; Pcu = 25 Watt 
∴ Input power to motor,

∴ Efficiency of motor,

Test: Fractional KW Motors of Electrical Machines- 1 - Question 2

The stepping angle for a 3 - stack, 16-tooth variable reluctance motor is:

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 1 - Question 2

Number of stacks or phases, n =3
Number of teeth or poles, P= 16 
∴ Stepping angle,

Test: Fractional KW Motors of Electrical Machines- 1 - Question 3

Consider the following statements related to an universal motor:
1. An universal motor runs on d.c. as well as on a.c.
2. No extra winding is required in a universal motor for ac operation.
3. The direction of rotation of universal motor can be reversed by reversing either the field or armature leads, but not both.
4. Universal motors are designed for operation at low speeds (less than 3500 rpm).
Of these, the correct statements are:

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 1 - Question 3

⇒ The compensating winding is required in an universal motor for ac operation to neutralize reactance voltage.
⇒ Universal motors are designed for operation at high speeds (> 3500 rpm).

Test: Fractional KW Motors of Electrical Machines- 1 - Question 4

An 8-pole, 50 Hz, single phase induction motor is running at 690 rpm. It’s slip w.r.t. backward and forward fields respectively are:

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 1 - Question 4


Test: Fractional KW Motors of Electrical Machines- 1 - Question 5

Single phase ac motors are classified on the basis of

Test: Fractional KW Motors of Electrical Machines- 1 - Question 6

In an induction motor

Test: Fractional KW Motors of Electrical Machines- 1 - Question 7

The torqued eveloped by a single phase induction motor drops to zero at

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 1 - Question 7


From above T-ω characteristic, T= 0 at speed = 0 and slightly below Ns.

Test: Fractional KW Motors of Electrical Machines- 1 - Question 8

In a single phase induction motor

Test: Fractional KW Motors of Electrical Machines- 1 - Question 9

In a comparative study of the torque-slip characteristic of a balanced poly-phase induction motor and that of a single phase induction motor, it is found that for zero slip

Detailed Solution for Test: Fractional KW Motors of Electrical Machines- 1 - Question 9



Test: Fractional KW Motors of Electrical Machines- 1 - Question 10

Double revolving field theory is based on the idea that pulsating field produced in single phase motors can be resolved into two components of ______ its amplitude and rotating in______ direction with synchronous sped .

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