Antennas and Wave Propagation

Multiple Choice Questions

1. ∇ × ∇ × E is
   1. ∇ ∇ .E −∇² E
   2. ∇² E − ∇ ∇ .E
   3. ∇² .E + ∇ E
   4. ∇ .E − E.∇
2. Unit vector of E is
   1. 
   2. |E|(a_x + a_y + a_z )
   3. E . E
   4. 
3. E × H is
   1. EH cos θ
   2. EH sin θ
   3. EH sin θ a_n
   4. EH cos θ a_n
4. E × (A + C) is
   1. E × C + E × A
   2. E . A + E × C
   3. A . E + C . E
   4. A × × − E × C
5. Gradient of a scalar is
   1. not defined
   2. a vector
   3. a scalar
   4. not periodic
6. Divergence of a vector is
   1. not defined
   2. a scalar
   3. a vector
   4. the same as gradient of a vector
7. The unit of del
   1. does not exist
   2. meter
   3. 1/meter
   4. dB
8. ∇² operates
   1. only on a scalar
   2. only on a vector
   3. on a scalar and also ...