# After keeping it open for a long time, the switch ‘in the circuit shown in the given figure is closed at t= 0. The capacitor voltage Vc (0+) and inductor iL (0) will be

1.  60 V and -0.3 A

2.  zero and 0.3 A

3.  150 V and zero

4.  90 V and – 0.3 A

4

60 V and -0.3 A

Explanation :
No Explanation available for this question

# An antenna is considered to be in free space where its height above the ground is

1.  λ

2.  2λ

3.   Less than 3λ

4.  More than 5λ

4

More than 5λ

Explanation :
No Explanation available for this question

# A delta connected network with Y-equivalent is shown below. The resistances R1, R2, R3 (in ohms) are respectively

1.  1.5, 3 and 9

2.  3, 9 and 1.5

3.  9, 3 and 1.5

4.  2, 1.5 and 9

4

9, 3 and 1.5

Explanation :
No Explanation available for this question

# The advantage of Marconi antenna over the ungrounded antenna is that

1.  Only one fourth of the height is required as compared to undergrounded antenna

2.   One half of the height is required as compared to ungrounded antenna

3.  No capacitance is required

4.  None of the above

4

One half of the height is required as compared to ungrounded antenna

Explanation :
No Explanation available for this question

# The discone antenna is

1.  useful direction finding antenna

2.   Used as a radar receiving antenna

3.  Useful as a UHF receiving antenna

4.  Circular polarized like other circularly antenna

4

Useful as a UHF receiving antenna

Explanation :
No Explanation available for this question

# The two electric sub-networks N1 and N2 are connected through three resistors as shown in the figure below. The voltage across 5 resistor and 1? resistor are given to be 10V and 5V respectively. Then voltage across 15? resistor is

1.  -105 V

2.  +105 V

3.  -15 V

4.  + 15 V

4

-105 V

Explanation :
No Explanation available for this question

# The radiation pattern of a parabola antenna is

1.  Omnidirectional

2.   A figure of eight

3.  Highly directional

4.  None of the above

4

Highly directional

Explanation :
No Explanation available for this question

# A parabolic antenna is commonly used for

1.  500 KHz

2.  50 MHz

3.  500 MHz

4.  5000 MHz

4

5000 MHz

Explanation :
No Explanation available for this question

# The intrinsic impedance of free space

1.  Increase with increase of frequency

2.  Decrease with increase of frequency

3.  Is independent of frequency

4.  None of these

4

Is independent of frequency

Explanation :
No Explanation available for this question

1.  1/r

2.  1/r2

3.  1/r3

4.   1/r4

4