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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.
| 7701. |
In the wheatstone bridge in figure, each resistance is increased by 0.05%. The value of v0 will be |
| A. | 50 mV |
| B. | 5 mV |
| C. | 0.1 mV |
| D. | zero |
| Answer» E. | |
| 7702. |
Consider the following Statements regarding resistance strain gauge The gauge factor is in the range of 2 to 5.The resistance changes due to change in specific resistance with strain.The resistance increases with increase in temperature. Of the above statements, which are correct? |
| A. | 1, 2, 3 |
| B. | 1 and 2 |
| C. | 2 and 3 |
| D. | 1 and 3 |
| Answer» E. | |
| 7703. |
PCM employing 4 bit code is used to send data having frequency range from 0 to 2 kHz. The minimum required bandwidth of carrier channel is |
| A. | 2 kHz |
| B. | 4 kHz |
| C. | 8 kHz |
| D. | 16 kHz |
| Answer» C. 8 kHz | |
| 7704. |
A sinusoidal ac voltage of amplitude 100 V is applied to a rectifying device which offers 10 Ω resistance in forward direction and infinite resistance in reverse direction. The reading on hot wire ammeter will be |
| A. | 10 A |
| B. | 5 A |
| C. | 3.185 A |
| D. | 1.414 A |
| Answer» C. 3.185 A | |
| 7705. |
When a capacitor is connected to the terminals of an ohmmeter, the pointer indicated a low resistance initially and finally come to infinity position. This shows that capacitor is |
| A. | short circuited |
| B. | all right |
| C. | faulty |
| D. | open circuited |
| Answer» C. faulty | |
| 7706. |
In an induction wattmeter, the shading bands are made of non conducting material. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7707. |
In the balanced bridge shown in figure. X should be |
| A. | a self inductance having resistance |
| B. | a capacitance |
| C. | a non-inductive resistance |
| D. | an inductance and capacitance in parallel |
| Answer» B. a capacitance | |
| 7708. |
If the current in a capacitor leads the voltage by 80 , the loss angle of capacitor is |
| A. | 80 |
| B. | 10 |
| C. | 100 |
| D. | 170 |
| Answer» C. 100 | |
| 7709. |
The lowest frequency used in satellite communications is __________ GHz. |
| A. | 0.8 |
| B. | 3 |
| C. | 18 |
| D. | 30 |
| Answer» B. 3 | |
| 7710. |
The average noise temperature of Earth, as viewed from space, is __________ K. |
| A. | 254 |
| B. | 303 |
| C. | 100 |
| D. | 500 |
| Answer» B. 303 | |
| 7711. |
Geosynchronous communication satellites travel around the earth in circular orbits with a forward speed of about __________ km/h. |
| A. | 11200 |
| B. | 0 |
| C. | 36000 |
| D. | 22800 |
| Answer» B. 0 | |
| 7712. |
In satellite communication, highly directional antennas are used to |
| A. | direct the spot beam to a particular region of space on Earth |
| B. | strengthen the beam to overcome the cosmic noise |
| C. | make corrections in change of polarisation of the beam |
| D. | select a particular channel in transmission and reception |
| Answer» B. strengthen the beam to overcome the cosmic noise | |
| 7713. |
System satellites orbit the Earth once in |
| A. | 24 hours |
| B. | 12 hours |
| C. | 1 hours |
| D. | 6 hours |
| Answer» B. 12 hours | |
| 7714. |
Low-orbit satellites are not used for communications because they |
| A. | produce sonic booms |
| B. | do not provide 24 hour/ day contact to the users on Earth |
| C. | heat up and melt |
| D. | none |
| Answer» D. none | |
| 7715. |
A few minutes disturbance in space communications occurs twice a year during Sunblinding when __________ are in line. |
| A. | Sun and satellite |
| B. | Sun and Earth station |
| C. | Satellite and Earth station |
| D. | Sun, satellite and Earth station |
| Answer» E. | |
| 7716. |
After the death of INSAT-IB, the mainstay of the entire Indian satellite network for some time to come would be |
| A. | INSTELSAT-V |
| B. | INSAT-ID |
| C. | INSAT-2 |
| D. | ARABSAT |
| Answer» E. | |
| 7717. |
For satellite transmission, analog signals may be converted into digital form with the help of |
| A. | modem |
| B. | transponder |
| C. | codec |
| D. | compandor |
| Answer» D. compandor | |
| 7718. |
Geosynchronous satellites are always launched in the equatorial plane because it is the only plane which provides |
| A. | 24-hour orbit |
| B. | stationary satellite |
| C. | global communication |
| D. | zero-gravity environs |
| Answer» D. zero-gravity environs | |
| 7719. |
The maximum signal propagation time of a geosynchronous satellite transmission is about __________ millisecond. |
| A. | 540 |
| B. | 270 |
| C. | 135 |
| D. | 1080 |
| Answer» C. 135 | |
| 7720. |
Ferrites have |
| A. | a low copper loss |
| B. | low eddy current loss |
| C. | low resistivity |
| D. | higher specific gravity compared to iron |
| Answer» C. low resistivity | |
| 7721. |
Assertion (A): Diamond and carborudum are both very hard materials.Reason (R): Valence band can be extremely strong. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7722. |
Nichrome is used for |
| A. | overload line wires |
| B. | heater coils |
| C. | lamp filaments |
| D. | all of the above |
| Answer» C. lamp filaments | |
| 7723. |
The chemical properties of atoms are determined by all the electrons and their configuration. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7724. |
Assertion (A): Hall effect is used to determine whether the semi- conductor is p or n type.Reason (R): Under the influence of field, holes and electrons move in opposite direction. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7725. |
The number of protons in a silicon atom are |
| A. | 4 |
| B. | 8 |
| C. | 12 |
| D. | 14 |
| Answer» E. | |
| 7726. |
The fact that domains exhibits spontaneous magnetisation is |
| A. | first hypothesis is of Curie |
| B. | second hypothesis is of Weiss |
| C. | Curie-Weiss law |
| D. | Boltzmann's statistics |
| Answer» C. Curie-Weiss law | |
| 7727. |
Kelvin's double bridge is used to measure low resistances because |
| A. | it has high sensitivity |
| B. | there is no thermoelectric emf |
| C. | resistance variation due to temperature |
| D. | effect of contact and lead resistances is eliminated |
| Answer» E. | |
| 7728. |
Assertion (A): Shunt of an ammeter has a low resistance.Reason (R): Shunt may be connected in series or in parallel with ammeter. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true R is false |
| D. | A is false R is true |
| Answer» D. A is false R is true | |
| 7729. |
The scale of hot wire instrument is linear. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7730. |
Consider the following galvanometers D'ArsonvalBallisticVibration Which of these are permanent magnet moving coil instruments? |
| A. | 1 and 2 only |
| B. | 1, 2 and 3 |
| C. | 2 and 3 only |
| D. | 1 and 3 only |
| Answer» C. 2 and 3 only | |
| 7731. |
The output of a Piezoelectric crystal has |
| A. | low amplitude and low impedance |
| B. | high amplitude and low impedance |
| C. | low amplitude and high impedance |
| D. | high amplitude and high impedance |
| Answer» D. high amplitude and high impedance | |
| 7732. |
A universal RLC bridge uses |
| A. | Maxwell bridge for measurement of inductance and De Sauty's bridge for measurement of capacitance |
| B. | Maxwell's bridge for measurement of inductance and modified De Sauty bridge for measurement of capacitance |
| C. | Maxwell Wien bridge for measurement of inductance and modified De Sauty bridge for measurement of inductance |
| D. | Maxwell Wien bridge for measurement of inductance and Wien bridge for measurement of capacitance |
| Answer» D. Maxwell Wien bridge for measurement of inductance and Wien bridge for measurement of capacitance | |
| 7733. |
A single phase energy meter operates on induction principle. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7734. |
The accuracy of measurement using CRO is about |
| A. | 0.5% |
| B. | 0.05 % |
| C. | 1% |
| D. | 3% |
| Answer» E. | |
| 7735. |
In body centred cubic structure, comers and centre of the cube are occupied by identical atoms. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7736. |
A dielectric is subjected to alternating field. The dielectric losses are potential to |
| A. | real part of dielectric constant |
| B. | imaginary part of dielectric constant |
| C. | both real and imaginary parts of dielectric constant |
| D. | either real or imaginary part of dielectric constant |
| Answer» C. both real and imaginary parts of dielectric constant | |
| 7737. |
Assertion (A): Dielectric losses are proportional to tan .Reason (R): tan = where r' and r" denote the real and imaginary parts of r. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7738. |
Inductors used at V.H.F. are made using |
| A. | air core |
| B. | cast iron cored |
| C. | sheet steel cored |
| D. | thin film technique |
| Answer» E. | |
| 7739. |
The noise temperature of sky is about __________ K. |
| A. | 100 |
| B. | 273 |
| C. | 0 |
| D. | 30 |
| Answer» E. | |
| 7740. |
The units for electric dipole moment are |
| A. | coulombs |
| B. | colomb-metre |
| C. | coulomb/metre |
| D. | coulomb/m |
| E. | <sup>2</sup> |
| Answer» C. coulomb/metre | |
| 7741. |
Assertion (A): The equation D = 0 rE is applicable only to isotropic materials.Reason (R): In polycrystalline materials, the directional effects are absent. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» C. A is true but R is false | |
| 7742. |
When an electron moves at velocity v in combined electric and magnetic fields E and H, the Lorentz force F is F = - e(E + v x B). |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7743. |
Assertion (A): Holes are majority carriers in p type semiconductor.Reason (R): In p type semiconductor, the electrons produced by thermal agitation recombine with holes. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7744. |
Assertion (A): Dielectric constant is independent of temperature unless the temperature is extremely high.Reason (R): For normal temperatures the number of atoms per unit volume is constant. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true but R is not correct explanation of A |
| C. | A is true but R is false |
| D. | A is false but R is true |
| Answer» B. Both A and R are true but R is not correct explanation of A | |
| 7745. |
The temperature at which some materials become superconductors is called |
| A. | Transition temperature |
| B. | Curie temperature |
| C. | Neel temperature |
| D. | Onnes temperature |
| Answer» B. Curie temperature | |
| 7746. |
Wheatstone bridge is suitable for low resistances. |
| A. | True |
| B. | False |
| Answer» C. | |
| 7747. |
In an homogeneous dielectric subjected to an electric field E, the dipole moment per unit volume is 0( r - 1) E. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 7748. |
Which of the following is not correct in respect of electrostatic instrument? |
| A. | It is essentially a voltmeter |
| B. | It is suitable for only high voltages |
| C. | It has a uniform scale |
| D. | It can be used for both ac and dc |
| Answer» D. It can be used for both ac and dc | |
| 7749. |
Two resistance R1 and R2 are connected in series R1 = 528 5 &ohm; and R2 = 325 3&ohm;. The total resistance will be |
| A. | 853 2 Ω |
| B. | 853 5 Ω |
| C. | 853 3 Ω |
| D. | 853 8 Ω |
| Answer» E. | |
| 7750. |
If A = 131 4 and B = 106 4, the percentage range of doubt in A - B is |
| A. | 4% |
| B. | 8% |
| C. | 16% |
| D. | 32% |
| Answer» E. | |