The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by
|
(a) 10 volt |
(b) 4 volt |
(c) 40 volt |
(d) 100 volt |
(b) 4 volt
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A laser beam of pulse power 1012 watt is focussed on an object are 10–4 cm2. The energy flux in watt/ cm2 at the point of focus is
|
(a) 1020 |
(b) 1016 |
(c) 108 |
(d) 104 |
In a meter bridge, the balancing length from the left end (standard resistance of one ohm is in the right gap) is found to be 20 cm. The value of the unknown resistance is
|
(a) 0.8 Ω |
(b) 0.5 Ω |
(c) 0.4 Ω |
(d) 0.25 Ω |
An atomic power nuclear reactor can deliver 300 MW. The energy released due to fission of each nucleus of uranium atom 
is 170 MeV. The number of uranium atoms fissioned per hour will be
(a) 30 
|
(b) 4 
|
(c) 10 
|
(d) 5 
|
An AM wave has 1800 watt of total power content, For 100% modulation the carrier should have power content equal to
|
(a) 1000 watt |
(b) 1200 watt |
(c) 1500 watt |
(d) 1600 watt |