If the input impedance of a half wave dipole Yagi-Uda is 73Ω, then input impedance of a half wave folded dipole as driven element is ____

Which of the following types of inter molecular interactions or forces is/are called van der Waals forces? 1. London forces 2. Dipole - dipole forces 3. Dipole - induced dipole forces 4. Hydrogen bonding Choose the correct code:

A

Only 2, 3 and 4

B

Only 1, 2 and 3

C

Only 3 and 4

D

Only 1 and 2

Which of the following is/are true about dipole? (1) The unit of electric dipole moment is coulomb meter (2) The net charge of the electric dipole is zero (3) The net electric field due to an electric dipole is nonzero. (4) Point diploe is the diploe with a small value of the charge.

A

Statement 1 & 2 only

B

All the above

C

Statement 1 & 3 only

D

Statement 1 only

A magnetic dipole of dipole moment $$\overrightarrow {\bf{m}} $$ is placed in a non-uniform magnetic field $$\overrightarrow {\bf{B}} .$$ If the position vector of the dipole is $$\overrightarrow {\bf{r}} ,$$ the torque acting on the dipole about the origin is

A

$$\overrightarrow {\bf{r}} \times \left( {\overrightarrow {\bf{m}} \times \overrightarrow {\bf{B}} } \right)$$

B

$$\overrightarrow {\bf{r}} \times \overrightarrow \nabla \left( {\overrightarrow {\bf{m}} .\overrightarrow {\bf{B}} } \right)$$

C

$$\overrightarrow {\bf{m}} \times \overrightarrow {\bf{B}} $$

D

$$\overrightarrow {\bf{m}} \times \overrightarrow {\bf{B}} + \overrightarrow {\bf{r}} \times \overrightarrow \nabla \left( {\overrightarrow {\bf{m}} .\overrightarrow {\bf{B}} } \right)$$

Consider the following statements. It converts the positive half cycle of the sinusoidal wave of the input to the pulsating DC output signal. It converts the positive half as well as negative half cycle of the sinusoidal wave of the input to pulsating DC output signal. Which of the following statements is CORRECT about half-wave rectifier?

A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 and 2

What is the input impedance of a half wave folded dipole?

A

73Ω

B

292Ω

C

146Ω

D

36.5Ω

Parasitic element that is typically about 5 percent longer than the half-wave dipole-driven element is called _______

A

Array element

B

Director element

C

Reflector element

D

Driven element

In the question one statement is given, followed by two conclusions, I and II. You have to consider the statement to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statement. Statement: A function is a relation between a set of input elements and a set of possible output elements where each input is related to exactly one output. Conclusion I: Every input element is related to every output element. Conclusion II: Every input element is related to one element of the output.

A

Only conclusion I follows

B

Only conclusion II follows

C

Neither I nor II follows

D

Both I and II follows

A half wave folded dipole of 3 wires has the impedance _____Ω.

A

675

B

657

C

219

D

292

If a square of a side 20 m is folded along one of its diagonal to form a triangle which is again folded along perpendicular drawn on hypotenuse and similarly once again folded along perpendicular drawn on hypotenuse. Then find hypotenuse of smallest triangle?

A

10√2

B

20√2

C

30√2

D

40√2

E

50√2

For a multi conductor folded dipole with n conductors, the impedance is ____ Ω.

A

2n Z

B

nZ

C

n2Z

D

Z/n

If the input impedance of a half wave dipole Yagi-Uda is 73Ω, then input impedance of a half wave folded dipole as driven element is ____

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