MCQOPTIONS
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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.
| 651. |
Which of the following expressions is invalid in Fortran? |
| A. | IA + IB |
| B. | IB * IC / ID |
| C. | IA * B |
| D. | - K * I + J |
| Answer» D. - K * I + J | |
| 652. |
Which of the following is correct in FORTRAN 77? |
| A. | <code>PARAMETER PMOS = 9.8, NMOS = X</code> |
| B. | <code>PARAMETER (PMOS = 9.8, NMOS = X)</code> |
| C. | <code>PARAMETER PMOS = 9.8, NMOS = X</code> |
| D. | <code>PARAMETER PMOS, NMOS = 9.8, X</code> |
| Answer» C. <code>PARAMETER PMOS = 9.8, NMOS = X</code> | |
| 653. |
P flag is for parity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 654. |
In 8086 the number of lines on which data and address is multiplexed is |
| A. | 8 |
| B. | 16 |
| C. | 20 |
| D. | 32 |
| Answer» D. 32 | |
| 655. |
Simpson's rule for numerical integration is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/microprocessors/40-496-1.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/microprocessors/40-496-2.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/microprocessors/40-496-3.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/microprocessors/40-496-4.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/microprocessors/40-496-2.png"> | |
| 656. |
The virtual height of an ionospheric layer is __________ true height |
| A. | equal to |
| B. | less than |
| C. | higher than |
| D. | no relation |
| Answer» D. no relation | |
| 657. |
The divergence of a vector is a scalar, while the curl of a vector is another |
| A. | scalar |
| B. | vector |
| C. | unit vector |
| D. | none of the above |
| Answer» C. unit vector | |
| 658. |
Due to which of the following reasons a lightning conductor on top of a building is made into a pointed spike? |
| A. | Dust particles may not accumulate |
| B. | Charge per unit area becomes very high for lightening to discharge |
| C. | Rain drops may not collect |
| D. | None of the above |
| Answer» C. Rain drops may not collect | |
| 659. |
An open wire transmission line having a characteristic impedance of 600 ohms is terminated by a resistive load of 900 &ohm;. The standing wave ratio will be |
| A. | 1.5 |
| B. | 2.5 |
| C. | 3.5 |
| D. | 4.5 |
| Answer» B. 2.5 | |
| 660. |
The skip distance is the maximum distance upto which ionospheric reflection is possible. |
| A. | True |
| B. | False |
| Answer» C. | |
| 661. |
When the phase velocity of an EM wave depends on frequency in any medium the phenomenon is called |
| A. | scattering |
| B. | polarisation |
| C. | absorption |
| D. | dispersion |
| Answer» C. absorption | |
| 662. |
The main disadvantage of the two-hole directional coupler is |
| A. | poor directivity |
| B. | narrow bandwidth |
| C. | high standing wave ratio |
| D. | low directional coupling |
| Answer» C. high standing wave ratio | |
| 663. |
The critical frequency of 'F' layer is greater than 30 MHz. |
| A. | True |
| B. | False |
| Answer» C. | |
| 664. |
Which of the following will increase the antenna radiation efficiency? |
| A. | Use of larger section of conductor |
| B. | Providing insulation on conductor |
| C. | Top loading of antenna |
| D. | Any of the above |
| Answer» D. Any of the above | |
| 665. |
A waveguide operated below cut off frequency can be used as |
| A. | phase shifter |
| B. | an attenuator |
| C. | an isolator |
| D. | none |
| Answer» C. an isolator | |
| 666. |
A time varying field is applied to a circuit with a capacitor- which of the following statements is correct? |
| A. | The conduction current is equal to the displacement current |
| B. | The conduction current density is J and displacement current density |
| C. | <img src="/_files/images/electronics-and-communication-engineering/electromagnetic-field-theory/187-30-1.png"> |
| D. | The current in the circuit consists of conduction current and displacement current |
| E. | The displacement current passes through the capacitor |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/electromagnetic-field-theory/187-30-1.png"> | |
| 667. |
The radiation pattern of Hertzian dipole in the plane perpendicular to dipole is a |
| A. | null |
| B. | circle |
| C. | figure of eight |
| D. | none of the above |
| Answer» D. none of the above | |
| 668. |
The transmitting antennas for lower frequencies (below 500 kHz) are generally |
| A. | vertical grounded wire type |
| B. | horizontal suspended wire type |
| C. | parabolic reflector type |
| D. | any of the above |
| Answer» B. horizontal suspended wire type | |
| 669. |
In an home T.V. receiver, the leed in from the antenna is |
| A. | coaxial cable of 75 Ω |
| B. | ordinary twisted wire |
| C. | bar copper wire |
| D. | twin wire |
| Answer» E. | |
| 670. |
A satellite that simply reflect back the signals from one region of the earth to the other region is known as |
| A. | orbiting satellite |
| B. | geostationary satellite |
| C. | active satellite |
| D. | passive satellite |
| Answer» E. | |
| 671. |
In H-plane metal plate lens the travelling wave front is |
| A. | totally retarded |
| B. | retarded |
| C. | accelerated |
| D. | neither accelerated nor retarded |
| Answer» C. accelerated | |
| 672. |
It is best to use for coupling a coaxial line to a parallel wire transmission line. |
| A. | directional Coupler |
| B. | balun |
| C. | slotted line |
| D. | tee |
| Answer» C. slotted line | |
| 673. |
MUF is depend upon |
| A. | electron density of the ionospheric layer |
| B. | 11 year sun spot cycle |
| C. | received frequency by receiver |
| D. | height of ionospheric layer |
| Answer» D. height of ionospheric layer | |
| 674. |
In case of antenna the ratio of the power radiated in the desired direction to the power radiated in the opposite direction is known as |
| A. | transmission efficiency |
| B. | front to back ratio |
| C. | loss coefficient |
| D. | none of the above |
| Answer» C. loss coefficient | |
| 675. |
If is the displacement current factor and s is conduction current density factor then which of the following statements is incorrect? |
| A. | For a lossless dielectric = 0 |
| B. | For an imperfect dielectric = 0 |
| C. | For a dielectric >> |
| D. | For a semiconductor = |
| Answer» C. For a dielectric >> | |
| 676. |
Which of the following is a valid logical expression in Pascal? |
| A. | 2.5 : = A |
| B. | (A + B) < < (C + D) |
| C. | A = < B |
| D. | A > = B |
| Answer» E. | |
| 677. |
In 8085 the pins for + 5 V input and ground are |
| A. | 20 and 40 respectively |
| B. | 40 and 20 respectively |
| C. | 1 and 2 respectively |
| D. | 1 and 1 respectively |
| Answer» C. 1 and 2 respectively | |
| 678. |
'Burst refresh' in DRAM is also called |
| A. | Concentrated refresh |
| B. | Distributed refresh |
| C. | Hidden refresh |
| D. | None of the above |
| Answer» B. Distributed refresh | |
| 679. |
The five flags in 8085 are designated as |
| A. | Z, CY, S, P and AC |
| B. | D, Z, S, P, AC |
| C. | Z, C, S, P, AC |
| D. | Z, CY, S, D, AC |
| Answer» B. D, Z, S, P, AC | |
| 680. |
Which characteristics of a memory chip is called dc characteristics? |
| A. | Organisation |
| B. | Timing characteristics |
| C. | Physical dimensions |
| D. | Power consumption and bus loading |
| Answer» E. | |
| 681. |
Consider the following strings AZ2X3YP12RBX Which of the above strings are valid in Pascal? |
| A. | All |
| B. | 1, 2, 3 |
| C. | 1, 2, 4, 5 |
| D. | 1, 2, 3, 5 |
| Answer» B. 1, 2, 3 | |
| 682. |
Consider the following statementsIn 8085 address and data buses are multiplexed.In Z 80 address and data buses are multiplexedIn Z 80 address and data buses are not multiplexed.Z 80 has 16 bit address bus and 8 bit data bus. Which of the above statements are correct? |
| A. | 1 and 2 only |
| B. | 1, 3 and 4 only |
| C. | 1, 2 and 4 only |
| D. | 2 and 4 only |
| Answer» D. 2 and 4 only | |
| 683. |
The stack pointer holds the address of the desired memory location. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 684. |
The organisatioion of Intel memory chip 127256 is |
| A. | 32 K x 8 |
| B. | 16 K x 8 |
| C. | 32 K x 4 |
| D. | 16 K x 4 |
| Answer» B. 16 K x 8 | |
| 685. |
In 8085 the data is stored in the stack on |
| A. | First in First Out basis |
| B. | Last in First Out basis |
| C. | First in Last Out basis |
| D. | Last in Last Out basis |
| Answer» C. First in Last Out basis | |
| 686. |
In a micro computer the control bus |
| A. | transmits and receives control signals between processor and other devices |
| B. | transmits and receives control signals, also sends and receives data |
| C. | transmits and receives control signals, sends and receives data and transmits address of the device |
| D. | none of the above |
| Answer» B. transmits and receives control signals, also sends and receives data | |
| 687. |
Read the following statements about time and space requirements of microprocessors Space requirement is also known as memory requirement.Space requirement is expressed in terms of bytes.Time requirement is expressed in terms of states.Time requirement is expressed in terms of - s. Which of the above statements are correct? |
| A. | 1, 2 and 3 only |
| B. | 1, 2 and 4 only |
| C. | 2 and 3 only |
| D. | 1 and 4 only |
| Answer» B. 1, 2 and 4 only | |
| 688. |
Assertion (A): Microprocessor 8085 has facility of interrupt control.Reason (R): TRAP, RST 7.5, RST 6.5, RST 5.5 and 1NTR are interrupt signals in 8085. |
| 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 R is wrong |
| D. | A is wrong R is correct |
| Answer» D. A is wrong R is correct | |
| 689. |
Assertion (A): C allows the use of logical operators, AND, OR, NOT.Reason (R): C has logical operators as well as bitwise operators like AND, OR etc. |
| 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 R is wrong |
| D. | A is wrong R is correct |
| Answer» C. A is correct R is wrong | |
| 690. |
Assertion (A): In microprocessor 8085 DMA allows direct access to memory to speed up data transfer.Reason (R): HOLD and HLDA signals are used for DMA operations. |
| 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 R is wrong |
| D. | A is wrong R is correct |
| Answer» C. A is correct R is wrong | |
| 691. |
The expression A ** B / C + D is equivalent to |
| A. | AB / C + D |
| B. | AB / C + D |
| C. | AB / (C + D) |
| D. | None of the above |
| Answer» C. AB / (C + D) | |
| 692. |
Which of the following is not a valid variable in FORTRAN 77? |
| A. | BRG |
| B. | VS |
| C. | VS 3A |
| D. | 3 VSA |
| Answer» E. | |
| 693. |
Consider the following symbolsLetters A to Z and a to zDigits 0 to 9Logical operators and, or, notParenthesis ( ) Which of the above symbols are available in Pascal? |
| A. | 1 and 2 only |
| B. | 1, 2 and 3 only |
| C. | 1, 2 and 4 only |
| D. | All |
| Answer» E. | |
| 694. |
Which of the following 8085 instructions does not belong to arithmetic group? |
| A. | <code>SHLD addr</code> |
| B. | <code>SUI data</code> |
| C. | <code>ADCM</code> |
| D. | <code>INR r</code> |
| Answer» B. <code>SUI data</code> | |
| 695. |
Consider the following ON GO TO statement in Basic 45 ON C GO TO 10, 20, 30 If the values of C are 1, 2, 3, 2.6 the control will be transferred to statement number |
| A. | 10, 20, 30, 20 respectively |
| B. | 10, 20, 20, 30 respectively |
| C. | 20, 30, 20, 10 respectively |
| D. | 10, 30, 20, 20 respectively |
| Answer» B. 10, 20, 20, 30 respectively | |
| 696. |
For an accurate clock period in 8085 it is preferable to use |
| A. | Crystal |
| B. | Crystal or LC resonant circuit |
| C. | Crystal or RC circuit |
| D. | LC or RC circuit |
| Answer» B. Crystal or LC resonant circuit | |
| 697. |
Consider the following about 'return' statement in C On executing the return statement, it immediately transfers the control back to the calling program.There is no restriction on the number of 'return' statements present in a function.The 'return' statement must be present at the end of called function. Which of the above are correct? |
| A. | All |
| B. | 1 and 2 only |
| C. | 1 and 3 only |
| D. | 2 and 3 only |
| Answer» C. 1 and 3 only | |
| 698. |
The memory hierarchy in microprocessor based system is |
| A. | register, cache, primary, mass, off line back up |
| B. | cache, register, primary, mass, off line back up |
| C. | cache, register, mass, primary, off line back up |
| D. | register, cache, mass, primary, off line back up |
| Answer» B. cache, register, primary, mass, off line back up | |
| 699. |
When a peripheral device is not ready for data transfer it will send to the microprocessor a |
| A. | low READY bit |
| B. | high READY bit |
| C. | low or high READY bit depending on whether input or output is activated |
| D. | none of the above |
| Answer» B. high READY bit | |
| 700. |
DMA stands for direct memory access. |
| A. | True |
| B. | False |
| Answer» B. False | |