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This set of Radiation and Microwave Techniques Multiple Choice Questions & Answers (MCQs) focuses on Radiation And Microwave Techniques Set 7
Q1 | _________ and __________ contribute to the impedance of a transmission line in thelumped element representation.
- resistor, inductor
- resistor, capacitor
- capacitor, inductor
- transistor, capacitor
Q2 | Characteristic impedance of a transmission line is:
- impedance z of a transmission line
- impedance which is a constant at any point on the transmission line
- reciprocal of admittance of a transmission line
- none of the mentioned
Q3 | The major advantage of single stub tuning over other impedance matchingtechniques is:
- lumped elements are avoided
- it can be fabricated as a part of transmission line media
- it involves two adjustable parameters
- all of the mentioned
Q4 | Shunt stubs are preferred for:
- strip and microstrip lines
- coplanar waveguides
- circular waveguide
- circulators
Q5 | In shunt stub matching, the key parameter used for matching is:
- admittance of the line at a point
- admittance of the load
- impedance of the stub
- impedance of the load
Q6 | For co-axial lines and waveguides, ________ is more preferred.
- open circuited stub
- short circuited stub
- slotted section
- co-axial lines cannot be impedance matched
Q7 | Maxwell’s equation for electromagnetic waves in a waveguide is:
- ∇×e = -jωµ(vector h)
- ∇×e =-jωμ(vector e)
- ∇×h=-jωμ(vector h)
- ∇×h=jωμ(vector h)
Q8 | The modes of wave propagation that a rectangular waveguide can support are:
- tem, te, modes
- tem,tm, te modes
- tem, tm modes
- te,tm modes
Q9 | In TM mode, if the direction of wave propagation is in ‘z’ direction, then:
- hz=0
- ez=0
- ey=0
- hy=0
Q10 | TEₒₒ mode for a rectangular waveguide:
- exists
- exists but defined only under special cases
- does not exist
- cannot be determined
Q11 | S parameters are expressed as a ratio of:
- voltage and current
- impedance at different ports
- indecent and the reflected voltage waves
- none of the mentioned
Q12 | Ferrite isolators are ____ port microwave devices.
- two
- three
- four
- none of the mentioned
Q13 | Directional coupler for waveguide are characterized by
- insertion loss
- coupling specification
- directivity
- all of the above
Q14 | A “circulator” is a device that:
- rotates signal polarity in a waveguide
- allows a signal to pass in one direction only
- separates signals among various ports
- prevents microwaves from being “trapped” in a waveguide
Q15 | The device commonly used in microwave ovens is the:
- twt
- klystron
- magnetron
- yig
Q16 | Power dividers and couplers are ______ microwave components used for powerdivision or power combining.
- passive
- active
- linear
- non linear
Q17 | T- junction is an example for:
- 2 port network
- 3 port network
- 4 port network
- none of the mentioned
Q18 | If a device is passive and contains no anisotropic elements, then the deviceis_______ network.
- reciprocal
- non reciprocal
- lossless
- lossy
Q19 | If a microwave network is lossless, then S matrix of the microwave network is:
- zero matrix
- symmetric
- identity matrix
- unitary
Q20 | The junction resistance and capacitance of the intrinsic region in a PIN diode areconnected______ in the equivalent circuit of PIN diode.
- series
- parallel
- connected across package capacitance
- none of the mentioned
Q21 | The width of depletion region of a varactor diode ________with increase in reversebias voltage.
- increases
- decreases
- remains constant
- none of the mentioned
Q22 | When a reverse bias voltage exceeding the breakdown voltage is applied to anIMPATT diode, it results in:
- break down of depletion region
- avalanche multiplication
- high reverse saturation current
- none of the mentioned
Q23 | Micro strip can be fabricated using:
- photo lithographic process
- electrochemical process
- mechanical methods
- none of the mentioned
Q24 | ________ is a single cavity klystron tube that operates as on oscillator by using areflector electrode after the cavity.
- backward wave oscillator
- reflex klystron
- travelling wave tube
- magnetrons
Q25 | Klystrons operates on the principal of
- amplitude modulation
- frequency modulation
- pulse modulation
- velocity modulation