What effect will be seen on the resistance of a wire if we increase the frequency?
a) it will also increase
b) it starts to decrease c) it will remain same d) it starts changing periodically

What is speed of radio waves in free space?
a) 3 x 106 m/s
b) 3 x 109 m/s c) 300 x 106 m/s d) 300 x 109 m/s

An antenna has “gain” as compared to ________
a) Helical antenna
b) Marconi antenna c) Vertically polarized radiator d) Isotropic radiator

Ground waves are most effective when _________
a) it is above about 20MHZ
b) it is below about 3MHz c) it is at microwave frequencies d) usually in the UHF range

The microwave frequency range is considered to start at ________
a) 1 GHz
b) 10 GHz c) 100 GHz d) 5 GHz

What is the approximate reliability of a microwave system?
a) 90%
b) 99% c) 99.99% d) 90.99%

Which modulation is used by a microwave system?
a) FM
b) SSB c) QAM d) Either FM or SSB or QAM

An inverting amplifier that amplifies dc input level is called
a) DC and AC amplifier
b) AC amplifier c) DC amplifier d) None of the mentioned

Why DC amplifier uses offset null circuitry?
a) To reduce the distortion in output
b) To improve the accuracy of amplifier c) To get large output gain d) All of the mentioned

Why are coupling capacitor used in audio receiver system?
a) All of the mentioned
b) Thermal drift c) Component tolerance d) Variation in signal

When does the offset voltage compensating network must be used in inverting configuration?
a) When the input is AC voltage
b) When the input is DC voltage c) When the input is either AC or DC voltage d) None of the mentioned

State the application in which summing, scaling or averaging amplifiers are used?
a) Multiplexers
b) Counters c) Audio mixers d) All of the mentioned

Find the maximum output voltage swing of an AC inverting amplifier using op-amp 741C?
a) +15Vpp
b) ±15Vpp c) ±13Vpp d) +13Vpp

How the peaking response is obtained?
a) Using a series LC network with op-amp
b) Using a series RC network with op-amp c) Using a parallel LC network with op-amp d) Using a parallel RC network with op-amp

In which amplifier the output voltage is equal to the negative sum of all the inputs?
a) Averaging amplifier
b) Summing amplifier c) Scaling amplifier d) All of the mentioned.

Determine the expression of output voltage for inverting summing amplifier consisting of four internal resistors?
a) Vo = -(Rf/R )×(Va +Vb+Vc+Vd)
b) Vo = (RF/R)×(Va +Vb+Vc+Vd) c) Vo = (R/ RF)×(Va +Vb+Vc+Vd) d) None of the mentioned

What is Mobile communication

Which of the following is a type of wireless communication?
a) LAN
b) WAN c) PAN d) All of the mentioned

Which of the following is not an example of wireless communication?
a) Wi-Fi
b) Mobiles c) Landline d) Wireless Computer Parts

Why wireless communication is used?
a) It enables billions of people to connect to the Internet
b) Lowers the cost of network infrastructure c) Makes services more inexpensive d) All of the mentioned

MIMO is a smart antenna technology.
a) False
b) True