## Related questions with answers

A shunt-connected dc motor has zero rotational losses and $R_A = 0$ Assume that $R_F + R_{adj}$ is constant [except in part (d)] and that $\phi$ is directly proportional to field current. For $V_T = 200 \ \text{V}$ and $P_{out} = 2 \ \text{hp}$ the speed is 1200 rpm. What is the effect on $I_A$ and speed if: $\textbf{a.}$ the load torque doubles; $\textbf{b.}$ the load power doubles; $\textbf{c.}$ $V_T$ is changed to 100 V and $P_{out}$ remains constant; $\textbf{d.}$ $R_F + R_{adj}$ is doubled in value and $P_{out}$ remains constant?

Solution

VerifiedFrom problem description we have:

$P_{rot} = 0 \ \text{W}, \ R_A = 0 \ \Omega, \ R_F + R_{adj} = \text{constant}, \ \phi \sim I_L$

$V_{T} = 200 \ \text{V}, \ P_{out} = 2 \ \text{hp}, \ n_m = 1200 \ \text{rpm}$

## Create a free account to view solutions

## Create a free account to view solutions

## Recommended textbook solutions

#### Fundamentals of Electric Circuits

6th Edition•ISBN: 9780078028229 (2 more)Charles Alexander, Matthew Sadiku#### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

4th Edition•ISBN: 9780133942651 (8 more)Randall D. Knight#### Electrical Engineering: Principles and Applications

7th Edition•ISBN: 9780134484143 (2 more)Allan R. Hambley#### Advanced Engineering Mathematics

10th Edition•ISBN: 9780470458365 (5 more)Erwin Kreyszig## More related questions

- physical science

1/4

- physical science

1/7