1
###
If fm is the modulation frequency in FM, the modulation index

If f_{m} is the modulation frequency in FM, the modulation index is proportional to

- f
_{m} - 1/f
_{m}^{2} - f
_{m}^{2} - 1/f
_{m}

2
###
What should be the minimum length of the antenna capable

What should be the minimum length of the antenna capable of emitting audio signal of wavelength λ?

- λ
- λ/2
- λ/4
- λ/8

3
###
If the band width is 1.6 x 10^12 Hz, how many communication

If the band width is 1.6 x 10^{12} Hz, how many communication channels can be obtained with 16 KHz band width radio signal?

- 10
^{8} - 10
^{11} - 10
^{10} - 10
^{15}

4
###
An insulator used in a transmission line has dielectric constant

An insulator used in a transmission line has dielectric constant equal to 0.25. What is the velocity factor of the transmission line?

- 2
- 4
- 4/3
- 3/4

5
###
A T.V. tower has a height 200 m

A T.V. tower has a height 200 m. By how much the height of tower be increased to triple its coverage range?

- 1800 m
- 1600 m
- 800 m
- 600 m

6
###
A radar has a power of 1 Kw and is operating at a frequency of 10 GHz

A radar has a power of 1 Kw and is operating at a frequency of 10 GHz. It is located on a mountain top of height 500 m. The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth = 6.4 x 10^{6} m) is

- 80 km
- 64 km
- 40 km
- 16 km

Write all the values of p for which the quadratic equation x^2 + px + 16 = 0
Amit, standing on a horizontal plane, finds a bird flying at a distance of 200 m
A solid iron pole consists of a cylinder of height 220 cm and base diameter 24 cm
Prove that Trigonometry Relation #05
Prove that Trigonometry Relation #04
Which term of the Arithmetic Progression –7, –12, –17, –22
How many terms of the Arithmetic Progression 45, 39, 33
In a class test, the sum of Arun’s marks in Hindi and English is 30