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
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
B.
50 Hz
When a single rectifier diode unit is placed in series with the load across an ac supply, it converts alternating voltage into a uni-directional pulsating voltage, the other half cycle being suppressed because it conducts only in one direction. Unless there is an inductance or battery in the circuit, the current will be zero, therefore for the half time. This is called half wave rectification.
In full wave a.c. or half wave rectifier, the time interval between two peaks are the same. But in half wave rectification, the negative wave part is cut off. But as for frequency or the period, they will be the same as seen from the figures. Therefore, this also will be 50 cycles/second.
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