Instantaneous Power MCQs : This section focuses on the "Instantaneous Power". These Multiple Choice Questions (MCQs) should be practiced to improve the Instantaneous Power skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
In inductor, the energy delivered by source is ____________ by inductor
A. stored as magnetic field
B. dissipated in the form of heat
C. returned to source
D. stored as electric field
Question 2
Instantaneous power is negative, when the polarities of voltage and current are of __________
A. opposite sign
B. same sign
C. voltage is zero
D. current is zero
Question 3
At θ=π/2, positive portion is __________ negative portion in power cycle.
A. greater than
B. less than
C. equal to
D. greater than or equal to
Question 4
If there is complex impedance in a circuit, part of energy is ____________ by reactive part and part of its energy is ____________ by the resistance.
A. alternately stored and returned, alternately stored and returned
B. alternately stored and returned, dissipated
C. dissipated, alternately stored and returned
D. dissipated, dissipated
Question 5
In capacitor, the energy delivered by source is ____________ by capacitor.
A. returned to source
B. dissipated in the form of heat
C. stored as electric field
D. stored as magnetic field
Question 6
In inductor, the energy delivered by source is ____________ by inductor.
A. stored as magnetic field
B. dissipated in the form of heat
C. returned to source
D. stored as electric field
Question 7
In P (t) equation, if θ=0, then P (t) =?
A. (VmIm/2)(1+cosωt)
B. (VmIm/2)(cosωt)
C. (VmIm/2)(cos2ωt)
D. (VmIm)(1+cos2ωt)
Question 8
In purely resistive circuit, energy delivered by source is ____________ by resistance.
A. dissipated in the form of heat
B. stored as electric field
C. stored as magnetic field
D. returned to source
Question 9
The average value of power if θ=0⁰ is?
A. VmIm/2
B. VmIm/2
C. VmIm/4
D. VmIm/8
Question 10
The equation of instantaneous power is?
A. P (t) = (VmIm/2)(cos(2ωt+θ)+sinθ)
B. P (t) = (VmIm/2)(sin(2ωt+θ)+cosθ)
C. P (t) = (VmIm/2)(cos(2ωt+θ)+cosθ)
D. P (t) = (VmIm/2)(sin(2ωt+θ)+sinθ)
Question 11
The time varying part in the equation of instantaneous power has frequency ________________ that of the frequency of voltage or current wave forms.
A. equal to
B. twice
C. thrice
D. four times