Question

A direct current (DC) motor is connected to a battery by means of two leads. The motor moves for slightly less than half the cycle and comes to halt. Which of the following components is missing?
A. One of the brushes
B. Commutator
C. Slip ring
D. One of the two magnets

Answer 1

Hint:
The above problem can be resolved using the generator's fundamentals and the components involved in DC motors. The slip rings are one of the significant electrical motor components that are utilized for power transmission. Along with the power transmission, the transmission of the electrical signals is also made possible by slip rings. The slip is made based on the requirement and purpose.

Complete step by step solution
In the analysis of the given problem, the slip ring is the component that seems missing. This observation's primary reason is that the slip possesses the function to maintain a mechanical connection within the motor and the stator, in his stationary state. In further analysis, the flow of current makes it change its direction for every half rotation of the rings, when used in DC motors. Hence if slip rings will be absent, then the rotation of the armature will stop.
Therefore, the missing component is the slip ring, and option (C) is correct.

Note:
To solve the given problem, one must clarify the fundamentals of the motors and generator’s components. The slip ring is among the essential components that find the AC and DC motor’s applications. Moreover, the Slip rings are also used to connect the three-phase windings to other components. Along with this, the slip rings are also utilised in modern dynamos and other mechanical arrangements.