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This set of Radiation and Microwave Techniques Multiple Choice Questions & Answers (MCQs) focuses on Radiation And Microwave Techniques Set 2
Q1 | amplifier.
- linear beam
- crossed field
- parallel field
- none of the mentioned
Q2 | reflector electrode after the cavity.
- backward wave oscillator
- reflex klystron
- travelling wave tube
- magnetrons
Q3 | A major disadvantage of klystron amplifier is:
- low power gain
- low bandwidth
- high source power
- design complexity
Q4 | The material out of which PIN diode is made is:
- silicon
- germanium
- gaas
- none of the mentioned
Q5 | GaAs is used in the fabrication of GUNN diodes because:
- gaas is cost effective
- it less temperature sensitive
- it has low conduction band electrons
- less forbidden energy gap
Q6 | GaAs is used in fabricating Gunn diode. Gunn diode is:
- bulk device
- sliced device
- made of different type of semiconductor layers
- none of the mentioned
Q7 | The mode of operation in which the Gunn diode is not stable is:
- gunn oscillation mode
- limited space charge accumulation mode
- stable amplification mode
- bias circuit oscillation mode
Q8 | an IMPATT diode, it results in:
- avalanche multiplication
- break down of depletion region
- high reverse saturation current
- none of the mentioned
Q9 | maintain at safe limit.
- average current
- average voltage
- average bias voltage
- average resistance
Q10 | Expression for the characteristic impedance of a transmission line(λ/4) used for impedance matching is:
- z1=√(zₒr)l
- z1=√(zₒ/r)l
- z1=√(zₒ+r)l
- none of the mentioned
Q11 | If there is no standing wave on a transmission line, then the value of SWR is:
- 1
- 0
- infinity
- insufficient data
Q12 | When a λ/4 transmission line is used for impedance matching, then which of the following is valid?
- standing waves are present on the λ/4 transmission line
- no standing waves on the λ/4 transmission line
- standing waves are not present both on the feed line and the matching λ/4 line
- standing waves are present on both the feed line and the matching λ/4 line
Q13 | The lowest mode of TE mode propagation in a circular waveguide is:
- te10 mode
- te00 mode
- te01 mode
- te11 mode
Q14 | Which primary parameter is uniformly distributed along the length of the conductor?
- g
- c
- l
- r
Q15 | Which of the following parameters does not exist in the transmission line equation?
- r
- zo
- zl
- propagation constant
Q16 | Find the characteristic impedance of a quarter wave with input and load impedances given by50 and 25 respectively.
- 50
- 25
- 75
- 35.35
Q17 | Calculate the transmission coefficient, when the incident and transmitted amplitudes are10 and 7 respectively.
- 17
- 3
- 10/7
- 0.7
Q18 | The reflection coefficient of a transmission line having characteristic and load impedancesas 50 and 30 ohm respectively is
- 1/4
- 1/8
- 1/2
- 3/4
Q19 | The major disadvantage of single stub tuning is:
- it requires a variable length of line between the load and the stub
- it involves 2 variable parameters
- complex calculation
- none of the mentioned
Q20 | In a double stub tuner circuit, the load is of _______ length from the first stub.
- fixed length
- arbitrary length
- depends on the load impedance to be matched
- depends on the characteristic impedance of the transmission line
Q21 | The major advantage of double stub tuning is:
- it uses 2 tuning stubs in fixed positions
- it involves 2 stubs
- length of the stub is variable
- none of the mentioned
Q22 | The modes of propagation supported by a rectangular wave guide is:
- tm, tem, te modes
- tm, te
- tm, tem
- te, tem
Q23 | Dominant mode is defined as:
- mode with the lowest cut off frequency
- mode with the highest cut off frequency
- any tem mode is called a dominant mode
- none of the mentioned
Q24 | The product of the phase and the group velocities is given by the
- speed of light
- speed of light/2
- 2 x speed of light
- (speed of light)/4
Q25 | For TE1ₒ mode, if the waveguide is filled with air and the broader dimension of thewaveguide is 2 cm, then the cutoff frequency is:
- 5 mhz
- 7.5 mhz
- 7.5 ghz
- 5 ghz