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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The use of study of hysteresis curve for a given material is to estimate the
|
(a) Voltage loss |
(b) Hysteresis loss |
(c) Current loss |
(d) All of these |
A transformer has 100 turns in the primary coil and carries 8 A current. If input power is one kilowatt, the number of turns required in the secondary coil to have 500V output will be
|
(a) 100 |
(b) 200 |
(c) 400 |
(d) 300 |
A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is
|
(a) ∞ |
(b) Zero |
(c) |
(d) |
The magnetic moment of a current carrying loop is 2.1 
. The magnetic field at a point on its axis at a distance of 1 
is
|
(a) 4.2 |
(b) 4.2 |
|
(c) 4.2 |
(d) 4.2 |
A bulb of 100 watt is hanging at a height of one meter above the centre of a circular table of diameter 4 m. If the intensity at a point on its rim is 
, then the intensity at the centre of the table will be
|
(a) |
(b) 2 |
(c) 2 |
(d) 5 |
Armature current in dc motor will be maximum when
|
(a) Motor has acquired maximum speed |
(b) Motor has acquired intermediate speed |
|
(c) Motor has just started moving |
(d) Motor is switched off |
The splitting of line into groups under the effect of electric or magnetic field is called
|
(a) Zeeman's effect |
(b) Bohr's effect |
|
(c) Heisenberg's effect |
(d) Magnetic effect |
If m1 and m2 are the refractive indices of the materials of core and cladding of an optical fibre, then the loss of light due to its leakage can be minimised by having
|
(a) m1 > m2 |
(b) m1 < m2 |
(c) m1 = m2 |
(d) None of these |
