If AM radio station increases its modulation index then there is an increase in receiving RF signal.
a) True
b) False

A single sideband modulation system requires a more complex demodulator circuit.
a) True
b) False

To demodulate a USB SSB signal, the receiver must ________
a) be set to USB mode
b) reinsert the carrier c) be set to USB mode and reinsert the carrier d) have low-fidelity

FSK stands for ________
a) Frequency Segregation Keying
b) Frequency Section Keying c) Frequency Signal Keying d) Frequency Shift Keying

When analyzing a transmission line, its inductance and capacitance are considered as _________
a) distributed
b) lumped c) equal reactances d) equal impedances

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