# Test: Electrical Machines & Power Systems- 1

## 10 Questions MCQ Test GATE Electrical Engineering (EE) 2023 Mock Test Series | Test: Electrical Machines & Power Systems- 1

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Attempt Test: Electrical Machines & Power Systems- 1 | 10 questions in 30 minutes | Mock test for GATE preparation | Free important questions MCQ to study GATE Electrical Engineering (EE) 2023 Mock Test Series for GATE Exam | Download free PDF with solutions
QUESTION: 1

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QUESTION: 2

Solution:
QUESTION: 3

### A 3φ, Induction Motor had Tmax as 300 N-m with a supply of 440 V, 50 Hz. If the supply is changed to 220 V, 25 Hz new Tmax is

Solution:
QUESTION: 4

The operating range of slip of an induction machine when it is operating in generating mode

Solution:
QUESTION: 5

In a capacitor start induction motor the power factor of main winding is 0.866 lag. The power factor of auxiliary winding should be

Solution:
QUESTION: 6

A 4 pole dynamo with wave wound armature has 51 slots containing 20 conductors in each slots. The induced emf is 357 volts and the speed is 8500rpm. The flux per pole will be

Solution:
QUESTION: 7

A 4 pole short shunt wave wound compound generator supplies 25 kW at terminal voltage of 500 V. The armature resistance is 0.1 Q, series field resistance is 0.15 Q and shunt field resistance is 126.875 Q. The emfgenerated is____________

Solution:
QUESTION: 8

A 230 V d.c. series motor develops its rated output at 1500 rpm while taking 20 A. Armature and series field resistance are 0.6 Q and 0.4 Q respectively. To obtain rated torque at 1000 rpm, external resistance mustbe added is____________

Solution:
QUESTION: 9

A shut Machine Connected to 250 V supply has an armatureresistance of 0.12 Ω and field  resistance of 100 Ω.  Then the ratio of the speed of machine as a generator to the machine as a motor, if the line current is 80A in both cases is____________

Solution:
QUESTION: 10

A 3φ, 50 Hz, 400 V, induction motor with 10 poles, running at speed of 540 rpm. If the number of poles reduced to 8, the newoperating slip is____________

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