MCQOPTIONS
Saved Bookmarks
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.
| 6951. |
A cycloconverter cannot give a frequency higher than input frequency. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6952. |
A thyristor has internal power dissipation of 40W and is operated at an ambient temperature of 20 C. If thermal resistance is 1.6 C/W, the junction temperature is |
| A. | 114 C |
| B. | 164 C |
| C. | 94 C |
| D. | 84 C |
| Answer» E. | |
| 6953. |
In a semi converter feeding a resistive load, |
| A. | the waveshapes of input voltage and input current are always similar |
| B. | the waveshapes of input voltage and input current can never be similar |
| C. | the waveshapes of input voltage and input current are similar only if firing angle is zero |
| D. | the waveshapes of input voltage and input current are similar only if firing angle is high |
| Answer» D. the waveshapes of input voltage and input current are similar only if firing angle is high | |
| 6954. |
In a single phase semi-converter the number of thyristors is |
| A. | 16 |
| B. | 8 |
| C. | 4 |
| D. | 2 |
| Answer» E. | |
| 6955. |
Match the following: List I (Transducer) List II (Quantity measured) A.LVDT1.PressureB.Bourden gauge2.TemperatureC.Strain gauge3.DisplacementD.Thermistor4.Stress |
| A. | A-4, B-3, C-2, D-1 |
| B. | A-3, B-2, C-1, D-4 |
| C. | A-4, B-1, C-3, D-2 |
| D. | A-3, B-1, C-4, D-2 |
| Answer» E. | |
| 6956. |
Match the following: List I List II A.Electro-encephalograph1.Diagnostic tool for heart ailmentB.Electro-cardiograph2.Diagnostic tool for brain ailmentC.Sphygmomanometer3.used for measuring BPD.Stethoscope4.used to heart pulse/ heart beat |
| A. | A-2, B-1, C-3, D-4 |
| B. | A-3, B-1, C-2, D-4 |
| C. | A-2, B-1, C-4, D-3 |
| D. | A-1, B-2, C-3, D-4 |
| Answer» B. A-3, B-1, C-2, D-4 | |
| 6957. |
Match the following: List I List II A.Laser1.Emits monochromatic light of low intensityB.Solar cell2.Consumes electrical power due to incident lightC.Photodiode3.Delivers power to a loadD.LED4.Emits monochromatic light of high intensity |
| A. | A-4, B-3, C-1, D-2 |
| 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» D. A-3, B-4, C-1, D-2 | |
| 6958. |
In a 3 phase bridge inverter, the gating signals for the three phases have a phase difference of |
| A. | 120 |
| B. | 60 |
| C. | 240 |
| D. | any of the above |
| Answer» B. 60 | |
| 6959. |
Assertion (A): The circuit of figure thyristor will conduct for 180 during positive half cycle if it is continuously fired. Reason (R): A thyristor can conduct only when it is forward biased. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R 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» E. | |
| 6960. |
Match the following: List I (Transducer) List II (Operation) A.Bourden tube1.Fluid flow to resistance changeB.Hot wire ammeter2.Velocity to pressureC.Hydrometer3.Pressure to displacementD.Pitot tube4.Specific gravity to displacement |
| A. | A-1, B-3, C-2, D-4 |
| B. | A-3, B-1, C-2, D-4 |
| C. | A-3, B-1, C-4, D-2 |
| D. | A-4, B-2, C-3, D-1 |
| Answer» C. A-3, B-1, C-4, D-2 | |
| 6961. |
Match the following: List I List II A.n-channel enhancement MOSFET pchannel1.B.p-channel enhancement MOSFET2.C.n-channel Depletion MOSFET3.D.p-channel Depletion MOSFET4. |
| A. | A-1, B-4, C-3, D-2 |
| B. | A-2, B-3, C-4, D-1 |
| C. | A-4, B-3, C-1, D-2 |
| D. | A-1, B-3, C-2, D-4 |
| Answer» D. A-1, B-3, C-2, D-4 | |
| 6962. |
Match the following: List I List II A.Ratio of maximum energy stored to energy dissipated per cycle1.Propagation constantB.TEM mode is loss less medium2.Cutoff frequency is zeroC.Ratio of frequency in radian to phase velocity of EM wave3.Quality factor of cavityD.TEM is the mode of lowest cutoff frequency4.Cylindrical waveguide |
| A. | A-3, B-2, C-4, D-1 |
| B. | A-2, B-3, C-1, D-4 |
| C. | A-3, B-2, C-1, D-4 |
| D. | A-2, B-3, C-4, D-1 |
| Answer» D. A-2, B-3, C-4, D-1 | |
| 6963. |
Match the following: List I List II A.1.B.2.C.3.D.4. 5. |
| A. | A-2, B-4, C-3, D-5 |
| B. | A-3, B-4, C-2, D-5 |
| C. | A-5, B-2, C-3, D-1 |
| D. | A-3, B-1, C-2, D-4 |
| Answer» C. A-5, B-2, C-3, D-1 | |
| 6964. |
Match the following: List I List II A.FM1.slope-overloadB.DM2. lawC.PSK3.Envelope detectorD.PCM4.Capture effect 5.Hilbert transform 6.Matched filter. |
| A. | A-5, B-1, C-6, D-4 |
| B. | A-4, B-6, C-1, D-5 |
| C. | A-4, B-1, C-6, D-2 |
| D. | A-6, B-3, C-4, D-2 |
| Answer» D. A-6, B-3, C-4, D-2 | |
| 6965. |
Match the following: List I List II A. x = 01.irrotational vectorB. . = 02.conservative fieldC.∮ .dl = 03.solenoidal vector |
| A. | A-3, B-1, C-2 |
| B. | A-1, B-2, C-3 |
| C. | A-2, B-3, C-1 |
| D. | A-3, B-2, C-1 |
| Answer» B. A-1, B-2, C-3 | |
| 6966. |
The 1150 kg geosynchronous satellite INSAT-IA parked 36000 km above India had greatly improved India's |
| A. | intelligence gathering capacity |
| B. | domestic communications |
| C. | meteorological capability |
| D. | both (b) and (c) |
| Answer» E. | |
| 6967. |
Presently, the worlds's largest and most advanced multi-purpose communication satellite is |
| A. | INSAT-2 |
| B. | Intelsat-V |
| C. | INSAT-ID |
| D. | Olympus-I |
| Answer» E. | |
| 6968. |
Depending on the technique used, digitized television requires a bit rate between __________ millions. |
| A. | 40 and 92.5 |
| B. | 25 and 60 |
| C. | 30 and 82.5 |
| D. | 2 |
| Answer» B. 25 and 60 | |
| 6969. |
A satellite link uses different frequencies for receiving and transmitting in order to |
| A. | avoid interference from terrestrial microwave links |
| B. | avoid interference between its powerful transmitted signal and weak in coming signal |
| C. | minimise free-space losses |
| D. | maximise antenna gain |
| Answer» C. minimise free-space losses | |
| 6970. |
In selecting a satellite system, the First determining factor is its |
| A. | EIRP |
| B. | antenna size |
| C. | coverage a sea |
| D. | antenna gain |
| Answer» D. antenna gain | |
| 6971. |
Phase modulation is commonly-used for data transmission mainly because |
| A. | phase can be varied from + 180 to 180 |
| B. | it is resistant to the effects of noise |
| C. | demodulation is very easy |
| D. | it gives highest data rates that can be transmitted over a given channel |
| Answer» C. demodulation is very easy | |
| 6972. |
India's Polar Satellite Launch vehicle (PSLV) to be ready in 1991 is designed to launch 1000 kg spacecraft into __________ orbit. |
| A. | geostationary |
| B. | equatorial |
| C. | polar |
| D. | sun-synchronous polar |
| Answer» E. | |
| 6973. |
Most of the communication satellites are stationed to the West of their service areas in order to reduce their |
| A. | eclipse period |
| B. | loss of power |
| C. | battery power provision |
| D. | mass of station-keeping fuel |
| Answer» D. mass of station-keeping fuel | |
| 6974. |
Mark out the WRONG statement.As compared to FDMA, the demand assignment system TDMA |
| A. | Needs very high-speed burst modems |
| B. | Faces no problems caused by intermodulation of carriers so that transponder can be used at its full power |
| C. | Needs high-speed manipulation of bit streams |
| D. | Is less flexible so that channels of widely different capacities cannot used and intermixed |
| Answer» E. | |
| 6975. |
APPLE was into orbit on 19 th June 1981 by European Space Agency (ESA) from |
| A. | Cape Canaveral in Florida |
| B. | Kourou in French Guyana |
| C. | Canarvon in Western Australia |
| D. | Bangalore in South India |
| Answer» C. Canarvon in Western Australia | |
| 6976. |
Space communication links are being increasingly moved into Ka-band (200-30 GHz) because it |
| A. | offers a much wider available bandwidth |
| B. | does not suffer from atmospheric at tenuation |
| C. | permits the use of smaller antenna |
| D. | does not suffer from rain attenuation |
| Answer» B. does not suffer from atmospheric at tenuation | |
| 6977. |
When a communication satellite passes into Earth's shadow, its temperature drops to about __________ K. |
| A. | 273 |
| B. | 243 |
| C. | 170 |
| D. | 123 |
| Answer» E. | |
| 6978. |
A typical signal strength received from a geosynchronous communication satellite is of the order of a few |
| A. | milliwatts |
| B. | kilowatts |
| C. | picowatts |
| D. | watts |
| Answer» D. watts | |
| 6979. |
A modem is |
| A. | a form of commutator |
| B. | a device for digitizing speech |
| C. | a circuit used for suppressing microwave mterference |
| D. | an electronic circuit which carries out modulation and demodulation of a carrier frequency |
| Answer» E. | |
| 6980. |
In synchronous detection of an AM signal |
| A. | Carrier is completely suppressed |
| B. | Both side hands are suppressed |
| C. | Only one side band and part of carrier is suppressed |
| D. | One side band and full carrier is suppressed |
| Answer» D. One side band and full carrier is suppressed | |
| 6981. |
The expression for satellite link frequencies such as 4/6 GHz denotes that |
| A. | 4 GHz is the up-link and 6 GHz is the down-link frequency |
| B. | 4 GHz is the down-link and 6 GHz is the up-link frequency |
| C. | the system operates at a mean frequency of 5 GHz |
| D. | one frequency is used as a back up for the other |
| Answer» C. the system operates at a mean frequency of 5 GHz | |
| 6982. |
Assuming a minimum angle of elevation of 5 , a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface. |
| A. | 30.3 |
| B. | 42.4 |
| C. | 50 |
| D. | 25 |
| Answer» E. | |
| 6983. |
In envelope detection of an AM waveform |
| A. | One side band and full-ampiitude carrier are needed |
| B. | Both side bands and full-amplitude carrier are needed |
| C. | Only two side bands are needed |
| D. | Upper side band and part of carrier are needed |
| Answer» C. Only two side bands are needed | |
| 6984. |
Shannon's Law relates |
| A. | antenna gain to frequency |
| B. | noise power to bandwidth |
| C. | information-carrying capacity to S/N ratio |
| D. | transmission losses to noise |
| Answer» C. information-carrying capacity to S/N ratio | |
| 6985. |
India's first three-axis stabilised geostationary communication satellite is |
| A. | Rohini |
| B. | Aryabhatta |
| C. | Apple |
| D. | Bhaskara |
| Answer» D. Bhaskara | |
| 6986. |
A colour television signal having bandwidth of 4.6 MHz is digitised using 10 bits sample. The digital bit rate used for its transmission with PCM would be __________ kilobits/second. |
| A. | 92000 |
| B. | 920 |
| C. | 23000 |
| D. | 230 |
| Answer» B. 920 | |
| 6987. |
Regarding TASI which one of the following statements is wrong? |
| A. | It snatches the channel in his speech and may allocate it to another speaker needing it. |
| B. | The same speaker is reassigned a channel almost instantly when he speaks again even when the circuit is heavily loaded. |
| C. | It increases the overall utilization of the transmission channel |
| D. | Intercontinental callers sometimes confuse the effects of TASI with the effects of satellite delay. |
| Answer» C. It increases the overall utilization of the transmission channel | |
| 6988. |
Match the following: List I List II A.Continuous and aperiodic1.Fourier representation is continuous and aperiodicB.Continuous and Periodic2.Fourier representation is discrete and aperiodicC.Discrete and aperiodic3.Fourier representation is continuous and periodicD.Discrete and periodic4.Fourier representation is discrete and periodic |
| A. | A-3, B-2, C-4, D-1 |
| B. | A-1, B-3, C-2, D-4 |
| C. | A-1, B-2, C-3, D-4 |
| D. | A-2, B-1, C-4, D-3 |
| Answer» D. A-2, B-1, C-4, D-3 | |
| 6989. |
The communication satellite INSAT-IB had to take up the job of INSAT-IA because the latter collapsed within __________ months of its launch. |
| A. | 12 |
| B. | 20 |
| C. | 5 |
| D. | 36 |
| Answer» D. 36 | |
| 6990. |
The distance of a synchronous satellite from Earth's surface is __________ km. |
| A. | 300 |
| B. | 10000 |
| C. | 35900 |
| D. | 5 |
| Answer» D. 5 | |
| 6991. |
Match the following: List I (Diode Rectifier) List II (Efficiency is Rf/RL = 0.25) A.Half wave1.0.54B.Bridge Rectifier2.0.65C.Full wave using tapped centre transformer3.0.325 |
| A. | A-1, B-2, C-3 |
| B. | A-2, B-1, C-3 |
| C. | A-3, B-2, C-1 |
| D. | A-3, B-1, C-2 |
| Answer» E. | |
| 6992. |
An SCR has a turn on time of 4 s. The gate pulse should have a duration of about |
| A. | 2 s |
| B. | 5 s |
| C. | 20 s |
| D. | 50 s |
| Answer» C. 20 s | |
| 6993. |
Assertion (A): When an SCR is conducting, the voltage drop across is about 1 V. Reason (R): When an SCR is conducting, the junction temperature is about 200 C. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R 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» D. A is wrong but R is correct | |
| 6994. |
A chopper cannot be line commutated. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 6995. |
If 4 quadrant operation is required we need |
| A. | dual converter |
| B. | full converter |
| C. | semi converter |
| D. | none of the above |
| Answer» B. full converter | |
| 6996. |
In a parallel inverter |
| A. | each thyristor is turned on twice during each cycle |
| B. | each thyristor is turned on once during each cycle |
| C. | each thyristor is turned on either once or twice in each load cycle |
| D. | each thyristor may be turned on upto four times in each load cycle |
| Answer» B. each thyristor is turned on once during each cycle | |
| 6997. |
In thermal ohm's law, temperature and power loss are analogous to |
| A. | V and I respectively of ohm's law |
| B. | I and V respectively of ohm's law |
| C. | R and V respectively of ohm's law |
| D. | I and R respectively of ohm's law |
| Answer» C. R and V respectively of ohm's law | |
| 6998. |
The output frequency of a cycloconverter can be changed by changing the firing angle. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6999. |
The difference between resonant commutation and self commutation is |
| A. | both these methods are based on entirely different principles |
| B. | in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current |
| C. | resonant commutation uses L and C but self commutation uses only capacitor |
| D. | none of the above |
| Answer» B. in resonant commutation, the commutating elements carry load current but in self commutation, the commutating elements do not carry load current | |
| 7000. |
Assertion (A): A fully controlled bridge converter can operate in first and fourth quadrant.Reason (R): A semi converter is cheaper than a full converter. |
| A. | Both A and R are correct and R is correct explanation of A |
| B. | Both A and R 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 | |