Oscillation of Energy at Resonance mcqs

What happens to the amplitude of oscillation at resonance?

a) It decreases

b) It increases

c) It remains constant

d) It cannot be determined

Answer: b) It increases

Explanation: At resonance the system absorbs maximum energy , resulting in an increase in the amplitude of oscillation

The resonant frequency of a simple harmonic oscillator depends on:

a) Mass only

b) Spring constant only

c) Both mass and spring constant

d) Neither mass nor spring constant

Answer: c) Both mass and spring constant

Explanation: The resonant frequency o f a simple harmonic oscillator is determined by both the mass of the object and the spring constant.

What happens to the phase difference between driving force and velocity at resonance?

a) The phase difference is 0 degrees

b) The phase difference is 90 degrees

c) The phase difference is 180 degrees

d) The phase difference is 360 degrees

Answer: a) The phase difference is 0 degrees

Explanation: At resonance, the driving force and velocity are in phase, resulting in a phase difference of 0 degrees.

At resonance, the power transferred to the oscillator is:

a) Maximum

b) Minimum

c) Zero

d) Constant

Answer: a) Maximum

Explanation: At resonance, the power transferred to the oscillator is maximum as the system absorbs maximum energy.

The quality factor (Q-factor) of an oscillator at resonance is:

a) Maximum

b) Minimum

c) Zero

d) Constant

Answer: a) Maximum

Explanation: The quality factor (Q-factor) of an oscillator at resonance is maximum, indicating a higher degree of energy efficiency and lower rate of energy loss.

In a damped oscillator, the resonance frequency:

a) Increases

b) Decreases

c) Remains unchanged

d) Cannot be determined

Answer: b) Decreases

Explanation: In a damped oscillator, the presence of damping causes a decrease in the resonance frequency.

What happens to the total energy of an oscillator at resonance?

a) It increases

b) It decreases

c) It remains constant

d) It cannot be determined

Answer: c) It remains constant

Explanation: At resonance, the total energy of the oscillator remains constant as the energy is continually exchanged between potential and kinetic forms.

Resonance occurs when the driving frequency is equal to the:

a) Natural frequency

b) Damping frequency

c) Angular frequency

d ) None of the above

Answer: a) Natural frequency

Explanation: Resonance occurs when the driving frequency matches the natural frequency of the oscillator.

The amplitude of oscillation at resonance depends on:

a) Mass only

b) Spring constant only

c) Damping coefficient only

d) Both spring constant and damping coefficient

Answer: b) Spring constant only

Explanation : The amplitude of oscillation at resonance, depends primarily on the spring constant of the oscillator.

What is the phase relationship between the displacement and acceleration of an oscillator at resonance?

a) They are in phase

b) They are 90 degrees out of phase

c) They are 180 degrees out of phase

d) They are 360 degrees out of phase

Answer: c) They are 180 degrees out of phase

Explanation: At resonance, the displacement and acceleration of an oscillator are 180 degrees out of phase.

What happens to the impedance of a resonant circuit at resonance?

a) It decreases

b) It increases

c) It remains constant

d) It cannot be determined

Answer: c) It remains constant

Explanation: At resonance, the impedance of a resonant circuit remains constant, resulting in maximum power transfer.

In a series RLC circuit, the resonance frequency depends on:

a) Resistance only

b) Inductance only

c) Capacitance only

d) Both inductance and capacitance

Answer: d) Both inductance and capacitance

Explanation: The resonance frequency of a series RLC circuit depends on both the inductance and capacitance values.

What happens to the phase angle between voltage and current in a resonant circuit at resonance?

a) The phase angle is 0 degrees

b) The phase angle is 90 degrees

c) The phase angle is 180 degrees

d) The phase angle is 360 degrees

Answer: a) The phase angle is 0 degrees

The bandwidth of a resonant circuit is defined as:

a) The range of frequencies over which the circuit resonates

b) The difference between the upper and lower resonance frequencies

c) The rate at which energy is dissipated in the circuit.

d) None of the above

Answer: b) The difference between the upper and lower resonance frequencies

What happens to the impedance of a parallel resonant circuit at resonance?

a) It decreases

b) It increases

c) It remains constant

d) It cannot be determined

Answer: b) It increases

Explanation: At resonance, the impedance of a parallel resonant circuit increases, resulting in maximum current flow.

The damping factor of an oscillator at resonance is:

a) Maximum

b) Minimum

c) Zero

d) Constant

Answer: c) Zero

Explanation: At resonance, the damping factor of an oscillator is zero, indicating the absence of damping forces.

What happens to the phase angle between voltage and current in a parallel resonant circuit at resonance?

a) The phase angle is 0 degrees

b) The phase angle is 90 degrees

c) The phase angle is 180 degrees

d) The phase angle is 360 degrees

Answer: c) The phase angle is 180 degrees

Explanation: At resonance, the voltage and current in a parallel resonant circuit have a phase angle of 180 degrees.

The condition for maximum power transfer in a resonant circuit is when the load impedance is:

a) Equal to the source impedance

b) Greater than the source impedance

c) Less than the source impedance

d) Independent of the source impedance

Answer: a) Equal to the source impedance

Explanation: For maximum power transfer in a resonant circuit, the load impedance must be equal to the source impedance .

The time period of oscillation at resonance in a simple harmonic oscillator is

a) Maximum

b) Minimum

c) Zero

d) Constant

Answer: d) Constant

Explanation: The time period of oscillation at resonance in a simple harmonic oscillator remains constant.

The phase difference between voltage and current in a purely resistive circuit at resonance is:

a) 0 degrees

b) 90 degrees

c) 180 degrees

d) 360 degrees

Answer: a) 0 degrees

Explanation: In a purely resistive circuit, the voltage and current are in phase, resulting in a phase difference of 0 degrees at resonance.