Assertion: No power loss associated with pure capacitor in ac circuit.
Reason: No current is flowing in this circuit.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false
C.
If assertion is true but reason is false
Assertion is true. When a capacitor is connected to an ac circuit
εrms = irms
Where is the impedance due to capacitive resistance. The power consumed in this circuit is zero because the phase difference between emf and current in a pure capacitance a.c circuit is . Power factor cos = 0. It is only for d.c that a current does not flow. Reason s false.
The camera lens has an aperture off and the exposure time is ( 1/60) s. What will be the new exposure time if the aperture become 1.4 f ?
A point source is kept at a distance of 1000 m has an illumination I. To change the illumination to 161 the new distance should become
250 m
500 m
750 m
800 m
If collector current is 120 mA and base current is 2 mA and resistance gain is 3, what is power again?
180
10800
1.8
18
If the highest modulating frequency of the wave is 5 kHz, the number of stations that can be accomodated in a 150 kHz bandwidth ?
15
10
5
None of these
In communication with help of antenna if height is dobled then the range covered which was initially r would become
3r
4r
5r
In the half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be
25 Hz
50 Hz
70.7 Hz
100 Hz
What is the amount of energy released by deuterium and tritium fusion? [ Given: =2.0141024 u, = 3.0160504 , = 1.0086654 u ]
60.6 eV
12.6 eV
17.6 eV
28.3 eV