My Report

Basic Electrical Engineering Practice Test 7


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. A laminated steel ring is wound with 200 turns. When the magnetizing current varies between 5 and 7 A, the magnetic flux varies between 760 and 800 Wb. Calculate the inductance of the coil.

2. A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the value of voltage 1s after the switch is closed.

3. Among the following, which is the right formula for growth in an inductive circuit?

4. A coil has a resistance of 4 ohms and an inductance of 2H. It is connected to a 20V dc supply. Calculate the final value of the current in the circuit.

5. What happens to the inductance as the length of the magnetic circuit increases?

6. If the current changes from 5A to 3A in x sec and inductance is 10H. The emf is 10V, calculate the value of x.

7. What is MMF?

8. What happens to the effective inductance when a ferromagnetic core is introduced?

9. The charging time constant of a circuit consisting of an inductor is the time taken for the current in the inductor to become __________% of the initial current.

10. What is the time constant of an inductive circuit?


 

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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