1. When an inductor tunes at 200 KHz with 624 pF capacitor and at 600 KHz with 60.4 pF capacitor then the self capacitance of the inductor would be ______

a) 8.05 pF                 b) 10.05pF                     c) 16.01pF                      d) 20.01pF

2. A step recovery diode _____________________

a) has on extremely short recovery time

b) conducts equally well in both directions

c) is mainly used as a harmonic generator

d) is an ideal rectifiers of high frequency signals

3. When a dipole antenna was radiating with some excitation in free space radiating a certain amount of the power v if then this antenna is immersed in a lake where water is non-dissipative but has a dielectric constant of 81, then the radiated power with the same excitation will be

a) Decrease to finite non-zero value           b) Remain the same                c) Increase               d) Decrease to zero

4. Radiation pyrometers are used for  the measurement of temperature in the range of _____________________

a) -2000C to 5000C                 b) 00C to 5000C                    c) 5000C to 12000C                     d) 12000C to 25000C

5. Data in the serial form can be converted into parallel form by using _____________________

a) PISO shift register                b) SOIP shift register                   c) SIPO shift register                 d) POIS shift register

6. Which is the following relate to rational transfer function of a system-

1. Ratio of Fourier transform of output to input with zero initial conditions.

2. Ratio of Laplace transform of output to input with zero initial conditions.

3. Laplace transform of system impulse response.

4. Laplace transform of system unit step response select the correct answer using the codes given below.

Codes

a) 1 and 4               b) 2 and 3               c) 1 and 3                 d) 2 and 4

7. In most microwave communication link rain drop attenuation is caused due to-

a) scattering of microwaves by water drops of specific size.

b) scattering of microwaves by a collection of droplets acing as a single body.

c) absorption of microwaves by water and consequent heating of the liquid

d) absorption of the microwaves by water vapor in the atmosphere.

8. (10110011)2 = (______)8

a) 253               b) 263                   c) 273                   d) 283

9. The difference between TWT & klystron is _____________________

a) In TWT electrons are in contact with RF field for long time & in klystron for short time

b) In klystron electrons are in contact with RF field for long time & in TWT for short time

c) In klystron there is no contact in RF field & electrons while in TWT there is contact

d) In TWT phase is no contact is RF field & electrons while in klystron there is contact

10. Before which of the following word will you put 'a'

a) hour             b) M.A.            c) Umbrella              d) Man

11. In the lattice network, the value of R for the maximum power transfer to the load _____________________

a) 5                  b) 6.5                c) 8               d) 9

12. If we have a parallel plate capacitor of plate area 'A' and plate separatoin t and having a capacity C and a metallic plate r of area A and of negligible thickness is introduced in the capacitor at a distance    from either of the two plates as shown in the given figure then the capacity of the capacitor will become _____________

a) C              b) 2C                  c) 4C

13. RF amplifier of an A.M. receiver is normally biased in _____________________

a) Class 'A'                     b) Class 'b'                      c) Class 'C'                     d) None

14. When two equal positive point charges are placed along  X- axis at X1 and _____________________X1 respectively then the electric field vector at a point P on the positive Y-axis will be directed-

a)  In the +x direction                b) In the ?x direction                  c) In the +y direction                 d) In the ?y direction

15. When a signal of 10 mV at 75 MHz is to be measured then which of the following instruments can be used _____________________

a) VTVM               b) Cathode ray oscilloscope                 c) Moving iron voltmeter                   d) Digital multimeter