In comparison to a half wave rectifier, the full wave rectifier gives lower
|
(a) Efficiency |
(b) Average dc |
|
(c) Average output voltage |
(d) None of these |
(d) None of these
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In a triode valve
|
(a) If the grid voltage is zero then plate current will be zero |
|
(b) If the temperature of filament is doubled, then the thermionic current will also be doubled |
|
(c) If the temperature of filament is doubled, then the thermionic current will nearly be four times |
|
(d) At a definite grid voltage the plate current varies with plate voltage according to Ohm’s law |
Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?
A current carrying coil is placed with its axis perpendicular to N-S direction. Let horizontal component of earth's magnetic field be Ho and magnetic field inside the loop is H. If a magnet is suspended inside the loop, it makes angle θ with H. Then θ =
|
(a) |
(b) |
(c) |
(d) |
$\text{m}\omega^2\text{l}$
$\text{Zero.}$
$\text{mg}$
$\frac{1}{2}\text{m}\omega^2\text{l}$
A cell of emf 6 V and resistance 0.5 ohm is short circuited. The current in the cell is
|
(a) 3 amp |
(b) 12 amp |
(c) 24 amp |
(d) 6 amp |
