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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 8651. |
Standard mismatches are used to calibrate SWR and impedance measuring equipments. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8652. |
As compared to LED, LASER has higher emission efficiencyno tuning arrangementnarrow spectral widthprovision for confinement Of these statements |
| A. | 1, 2, 3 are correct |
| B. | 1, 2, 4 are correct |
| C. | 1 and 3 are correct |
| D. | 1, 3, 4 are correct |
| Answer» E. | |
| 8653. |
The number of storage classes in C is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» D. 6 | |
| 8654. |
Match the following: List I List II A.SSB Modulation1.Transmission lineB. . B = 02.Hilbert transformC.Model dispersion3.Faraday's law 4.Absence of magnetic monopoles 5.Waveguides 6.Phase locked loop |
| A. | A-1, B-3, C-5 |
| B. | A-5, B-4, C-2 |
| C. | A-6, B-4, C-5 |
| D. | A-2, B-4, C-5 |
| Answer» E. | |
| 8655. |
Match the following: List I List II A.1.B.2.C.3.D.4. |
| A. | A-1, B-2, C-3, D-4 |
| B. | A-3, B-4, C-2, D-1 |
| C. | A-4, B-3, C-2, D-1 |
| D. | A-3, B-4, C-1, D-2 |
| Answer» C. A-4, B-3, C-2, D-1 | |
| 8656. |
Match the following: List I (type of controller) List II (Operation)A.Pneumatic controller1.Flexible operationB.Hydraulic controller2.High torque high speed operationC.Electronic controller3.Fire and explosion proof operation |
| A. | A-1, B-3, C-2 |
| B. | A-1, B-2, C-3 |
| C. | A-3, B-1, C-2 |
| D. | A-3, B-2, C-1 |
| Answer» E. | |
| 8657. |
Match the following: List I List II A.DIAC1.B.TRIAC2.C.SIT3.D.LASCR4. |
| A. | A-4, B-2, C-3, D-1 |
| B. | A-1, B-2, C-3, D-4 |
| C. | A-1, B-4, C-2, D-3 |
| D. | A-3, B-2, C-1, D-4 |
| Answer» D. A-3, B-2, C-1, D-4 | |
| 8658. |
Match the following: List I List II A.RT1.A = DB.Rh2.h12 = h21C.ST3.AD - BC = 1D.Sh4.h21 = - h21 5.B = C 6. h = 1 |
| A. | A-3, B-4, C-1, D-6 |
| B. | A-3, B-2, C-5, D-4 |
| C. | A-5, B-4, C-1, D-2 |
| D. | A-5, B-4, C-1, D-6 |
| Answer» B. A-3, B-2, C-5, D-4 | |
| 8659. |
Match the following: List I (Operator in C) List II (Priority of Operation) A.!1.1B.< >2.2C. 3.3D.=4.4 |
| A. | A-1, B-2, C-3, D-4 |
| B. | A-1, B-3, C-2, D-4 |
| C. | A-4, B-3, C-2, D-1 |
| D. | A-3, B-2, C-1, D-4 |
| Answer» C. A-4, B-3, C-2, D-1 | |
| 8660. |
Match the following: List I (Oscillator) List II (Features) A.Wien Bridge1.RF oscillator, uses two inductors and one capacitorB.Colpitt's2.LC oscillator for radio frequencies uses three capacitances and one inductanceC.Hartley3.RC oscillator for audio frequenciesD.Clapp4.RF oscillator, uses two capacitances and one inductance |
| A. | A-2, B-1, C-4, D-3 |
| B. | A-2, B-4, C-1, D-3 |
| C. | A-3, B-4, C-1, D-2 |
| D. | A-3, B-1, C-4, D-2 |
| Answer» D. A-3, B-1, C-4, D-2 | |
| 8661. |
Match the following: List I (Symbol in java) List II (Meaning)A.&1.Logical ANDB. 2.ANDC.| |3.XORD.& &4.Logical OR |
| A. | A-1, B-2, C-3, D-4 |
| B. | A-2, B-3, C-1, D-4 |
| C. | A-4, B-2, C-3, D-1 |
| D. | A-2, B-3, C-4, D-1 |
| Answer» E. | |
| 8662. |
Match the following: List I f(t) List II F(s) A.t1.B.eat2.C.u(t)3.D.cos t4. |
| A. | A-1, B-3, C-2, D-4 |
| B. | A-1, B-4, C-2, D-3 |
| C. | A-2, B-4, C-1, D-3 |
| D. | A-4, B-3, C-1, D-2 |
| Answer» E. | |
| 8663. |
Match the following: List I (Camera pick up tubes) List II (Developed by) A.CCD charger1.ToshibaB.New vicon2.PhilipsC.Plumbicon3.MatushitaD.Chalnicon4.RCA |
| A. | A-3, B-4, C-1, D-2 |
| B. | A-4, B-3, C-2, D-1 |
| C. | A-4, B-3, C-1, D-2 |
| D. | A-1, B-2, C-3, D-4 |
| Answer» C. A-4, B-3, C-1, D-2 | |
| 8664. |
Match the following: List I (DOS commands) List II (Meaning) A.ATTRIB1.Displays all directories and subdirectoriesB.SCAN DISK2.Moves files to another directorC.MOVE3.Checks the status of discD.TREE4.Hides a file |
| A. | A-1, B-2, C-3, D-4 |
| B. | A-3, B-4, C-2, D-1 |
| C. | A-2, B-3, C-4, D-1 |
| D. | A-4, B-3, C-2, D-1 |
| Answer» E. | |
| 8665. |
Match the following: List I List II A.1.ZeroB.2.0.2C.3.ActuatorD.4.infinity |
| A. | A-1, B-2, C-3, D-4 |
| B. | A-1, B-3, C-2, D-4 |
| C. | A-4, B-3, C-2, D-1 |
| D. | A-4, B-2, C-3, D-1 |
| Answer» E. | |
| 8666. |
Match the following: List I List II A.Horn antenna1.High directivityB.Parabolic antenna2.Very high directivityC.Lens antenna3.Moderate directivity |
| A. | A-1, B-2, C-3 |
| B. | A-3, B-2, C-1 |
| C. | A-3, B-1, C-2 |
| D. | A-1, B-3, C-2 |
| Answer» D. A-1, B-3, C-2 | |
| 8667. |
Match the following: List I List II A.TV1.1 kHzB.Radio2.3 kHzC.Telephony3.9 kHzD.Telegraphy4.5 MHz |
| A. | A-4, B-1, C-2 |
| B. | A-4, B-3, C-2 |
| C. | A-2, B-1, C-3 |
| D. | A-1, B-2, C-3 |
| Answer» C. A-2, B-1, C-3 | |
| 8668. |
Consider the following statements, SWR of a transmission line is infinite when the load is a short circuita complex impedancean open circuita pure reactance Which of the above statements are correct? |
| A. | 1 and 3 only |
| B. | 1, 2, 3 |
| C. | 2, 3, 4 |
| D. | 1, 2, 4 |
| Answer» B. 1, 2, 3 | |
| 8669. |
In a reflex klystron the output frequency is determined primarily by resonant frequency of cavity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8670. |
The arrangement in the given figure is a hybid T. If 100 mW fed at port 1, the power reflected back at port 1 is |
| A. | 0 |
| B. | 25 mW |
| C. | 50 mW |
| D. | 100 mW |
| Answer» D. 100 mW | |
| 8671. |
Assertion (A): Two equal and opposite travelling waves result in a standing wave.Reason (R): The ratio of maximum to minimum value of a standing wave is called SWR. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» C. A is correct but R is wrong | |
| 8672. |
In a TWT the loss in attenuator is |
| A. | almost equal to forward gain of tube |
| B. | much less than forward gain of tube |
| C. | much higher than forward gain of tube |
| D. | almost infinite |
| Answer» B. much less than forward gain of tube | |
| 8673. |
Loading of a line means |
| A. | increasing inductance of line |
| B. | increasing distributed inductance of line |
| C. | decreasing distributed inductance of line |
| D. | decreasing inductance of line |
| Answer» C. decreasing distributed inductance of line | |
| 8674. |
Which of the following are true for magic tee in the given figure select the answer as per given codes S13 = S23S14 = S24S12 = 0S34 = 0 |
| A. | 1, 2 and 3 |
| B. | 1, 2 and 4 |
| C. | 2, 3 and 4 |
| D. | 1, 3 and 4 |
| Answer» D. 1, 3 and 4 | |
| 8675. |
The frequency of oscillations obtained from a reflex klystron depends mainly on |
| A. | resonant frequency of cavity |
| B. | repeller voltage |
| C. | voltage of focussing electrode |
| D. | characteristics of cathode |
| Answer» B. repeller voltage | |
| 8676. |
The manufacturing technique used to manufacture strip type transmission line is |
| A. | photoetching technique |
| B. | oxidation technique |
| C. | cladding |
| D. | epitaxial |
| Answer» B. oxidation technique | |
| 8677. |
A circular waveguide has an infinite set of TE and TM modes. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8678. |
When a wave reaches an open circuit |
| A. | the voltage at termination is doubled the incident voltage |
| B. | the current at termination is doubled the incident voltage |
| C. | the voltage at termination is zero |
| D. | both V and I at termination are doubled the incident voltage and current |
| Answer» B. the current at termination is doubled the incident voltage | |
| 8679. |
Assertion (A): In circular waveguide the attenuation of TE01 mode decreases as the operating frequency increases.Reason (R): The wall currents in a circular waveguide in TEQ1 mode are completely circumferential. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» C. A is correct but R is wrong | |
| 8680. |
Consider the following statements Usable bandwidth of ridge wave guide is more than that of rectangular waveguide.For a given value of TM10 cutoff frequency the cross section of ridge wave guide is lesser that that of rect angular waveguide.Ridge wave guide has higher conductor losser than a rectangular waveguide.Ridge guide has higher conductor losser than a rectangular waveguide. Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1, 2 and 3 only |
| C. | 2 and 3 only |
| D. | All |
| Answer» C. 2 and 3 only | |
| 8681. |
Radar reciever has high sensitivity and low noise figure |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8682. |
For a waveguide, which of the following statements is wrong? |
| A. | It is usually made of brass or aluminium |
| B. | It is usually rectangular or circular in shape |
| C. | The dielectric region is usually air |
| D. | The wall thickness is very small as compared to skin depth |
| Answer» E. | |
| 8683. |
The main advantage of TWT over klystron is |
| A. | higher bandwidth |
| B. | higher gain |
| C. | higher frequency |
| D. | higher output |
| Answer» B. higher gain | |
| 8684. |
Directive gain of elementary doublet is |
| A. | 100 |
| B. | 10 |
| C. | 1.5 |
| D. | 0.5 |
| Answer» D. 0.5 | |
| 8685. |
An electromagnetic wave can be completely guided by a dielectric rod or slab. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8686. |
Performance of a PIN diode switch is represented by |
| A. | insertion loss when switch is off |
| B. | insertion loss when switch is on |
| C. | insertion loss when switch is on and isolation loss when switch is off |
| D. | insertion loss when switch is off and isolation loss when switch is on |
| Answer» D. insertion loss when switch is off and isolation loss when switch is on | |
| 8687. |
In a TWT the phase velocity of the axial component of the field on the slow wave structure is kept |
| A. | equal to velocity of electron |
| B. | slightly less than velocity of electron |
| C. | slightly more than velocity of electron |
| D. | equal to velocity of light in free space |
| Answer» B. slightly less than velocity of electron | |
| 8688. |
A magic tee is to be used as CW duplexer. Then port 1, port 2, port 3 (E arm), port 4 (H arm) respectively should be connected to |
| A. | matched load, antenna, receiver and CW transmitter |
| B. | CW transmitter, antenna, receiver and matched load |
| C. | CW transmitter, receiver, antenna and matched load |
| D. | CW transmitter, matched load, receiver and antenna |
| Answer» B. CW transmitter, antenna, receiver and matched load | |
| 8689. |
In microwave detector used in laboratory measurements of relative power levels, standing wave ratio is about |
| A. | 0.1 |
| B. | 1.25 |
| C. | 5 |
| D. | 10 |
| Answer» C. 5 | |
| 8690. |
Fields are said to be circularly polarized if |
| A. | their magnitudes are equal |
| B. | their magnitudes are equal and they differ in phase by 90 |
| C. | their magnitudes are unequal and they differ in phase 90 |
| D. | their magnitudes are unequal and they are in phase |
| Answer» C. their magnitudes are unequal and they differ in phase 90 | |
| 8691. |
A line of characteristic impedance 400 is terminated by a resistance of 400 . The reflected quantities are |
| A. | zero |
| B. | equal to incident quantities |
| C. | half the incident quantities |
| D. | double the incident quantities |
| Answer» B. equal to incident quantities | |
| 8692. |
Wave guides are pressurised above normal atmospheric pressure for |
| A. | increasing the power handling capacity |
| B. | improving conductivity of walls |
| C. | preventing higher modes from propagation |
| D. | varying the wave impedance |
| Answer» B. improving conductivity of walls | |
| 8693. |
Assertion (A): In a power divider SH = 0, S21 = 0.707 = S3, Reason (R): In a power divider the input port (i.e., port 1) is matched and incident power is equally divided in output ports 2 and 3 |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R are correct but R is not correct explanation of A |
| C. | A is correct but R is wrong |
| D. | A is wrong but R is correct |
| Answer» B. Both A and R are correct but R is not correct explanation of A | |
| 8694. |
A waveguide twist is used to change the plane of polarization. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8695. |
VTM stands for voltage tunable magnetron. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8696. |
Generally the wall thickness of rectangular waveguide is |
| A. | about 1-5 mils |
| B. | about 40-100 mils |
| C. | about 0.1 to 0.5 mils |
| D. | about 500 mils |
| Answer» C. about 0.1 to 0.5 mils | |
| 8697. |
Ridge waveguide is essentially a form of capacitively loaded guide. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8698. |
In a Gunn diode oscillator drift velocity of electron is 107 cm/s and active region length is 10 x 10-4 cm. The natural frequency of oscillation is |
| A. | 1 MHz |
| B. | 10 MHz |
| C. | 1 GHz |
| D. | 10 GHz |
| Answer» E. | |
| 8699. |
A directional coupler is used |
| A. | to transmit microwave signals |
| B. | to generate microwave signals |
| C. | to measure amplitude and phase of a travelling wave |
| D. | both (a) and (b) |
| Answer» D. both (a) and (b) | |
| 8700. |
Consider the following statements about a magic tee The collinear arms are isolated from each other.On of the collinear arms is isolated from E arm.On of the collinear arms is isolated from H arm.E and H arms are isolated from each other. Of the above statements |
| A. | 1 and 2 are correct |
| B. | 1 and 3 are correct |
| C. | 1 and 4 are correct |
| D. | 2 and 3 are correct |
| Answer» D. 2 and 3 are correct | |