Dynamic braking is very effective for:
Show Hint
- DC series motor
- DC shunt motor
- Separately excited DC motor
- Cumulatively compound DC motor
The Correct Option is B
Solution and Explanation
Step 1: Dynamic braking is a method of slowing down a DC motor by disconnecting it from the power supply and connecting a resistor across the armature. This causes the motor to act as a generator, dissipating energy as heat.
Step 2: In a DC shunt motor, the field winding is connected in parallel with the armature, ensuring a nearly constant magnetic field during braking. This provides smooth and effective braking.
Step 3: DC series motors are less effective in dynamic braking since their field winding is in series with the armature, and the field weakens as the speed decreases.
Step 4: Separately excited and cumulatively compound DC motors also exhibit braking effects, but they are not as efficient or stable as in DC shunt motors.
Top TANCET Electrical Engineering Questions
- The resultant magnetic flux generated in the closed surface will be
The motion of electrons in a CRT is due to:
- H in the region \( 0 \leq l \leq a \) for an infinitely long co-axial transmission line is:
The direction of current flow in the circuit is such that the induced magnetic field produced by the induced current will oppose the original magnetic field. This is:
The electromagnetic wave propagates in free space with a speed of:
Top TANCET Electric circuits and fields Questions
The motion of electrons in a CRT is due to:
Energy stored in the capacitor is:
- Which of the following motors is expected to have maximum full-load efficiency?
A transformer steps up the voltage by a factor of 100. The ratio of current in the primary to that in the secondary is:
Power factor of a power transformer on no load will be about:
Top TANCET Questions
- If \( A \) is a \( 3 \times 3 \) matrix and the determinant of \( A \) is 6, then find the value of the determinant of the matrix \( (2A)^{-1} \):
- If the system of equations: \[ 3x + 2y + z = 0, \quad x + 4y + z = 0, \quad 2x + y + 4z = 0 \] is given, then:
- Let \[ M = \begin{bmatrix} 1 & 1 & 1 \\ 0 & 1 & 1 \\ 0 & 0 & 1 \end{bmatrix} \] The maximum number of linearly independent eigenvectors of \( M \) is:
- The shortest and longest distance from the point \( (1,2,-1) \) to the sphere \( x^2 + y^2 + z^2 = 24 \) is:
- The solution of the given ordinary differential equation \( x \frac{d^2 y}{dx^2} + \frac{dy}{dx} = 0 \) is: