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.
| 5551. |
A generator of 50 internal impedance and operating at 1 GHz feeds a 75 load via a coaxial line of characteristic impedance 50 . The VSWR on the feed line is |
| A. | 0.5 |
| B. | 1.5 |
| C. | 2.5 |
| D. | 1.75 |
| Answer» C. 2.5 | |
| 5552. |
Hall coefficient RH is directly proportional to the charge densityRH depends upon type of the semiconductor material (n - type or p - type)Hall co-efficient RH is directly proportional to hall voltage VH From the above statements which are the false statements? |
| A. | I only |
| B. | II only |
| C. | III only |
| D. | all of the above |
| Answer» B. II only | |
| 5553. |
In a series operated thyristor configuration, each thyristor should support 100 V. However, the three thyristors only support voltage of 100 V, 90 V and 85 V respectively. Hence, the string efficiency in the case is : |
| A. | 98.45% |
| B. | 45.84% |
| C. | 91.67% |
| D. | none of these |
| Answer» D. none of these | |
| 5554. |
A speech signal, band limited to 4kHz and peak voltage varying between + 5V and - 5V is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits. If the bits 0 and 1 are transmitted using bipolar pulses, the minimum bandwidth required for distortion free transmission is |
| A. | 64 kHz |
| B. | 32 kHz |
| C. | 8 kHz |
| D. | 4 kHz |
| Answer» E. | |
| 5555. |
For a binary symmetric channel, the error probability Pc(0) = Pc(1) = and errors are statistically independent. The channel capacity for a signalling speed 2 bits/second. |
| A. | 2 bits/sec |
| B. | 1.69 bits/sec |
| C. | 4 bits/sec |
| D. | 1 bit/sec |
| Answer» B. 1.69 bits/sec | |
| 5556. |
Figure below shows D type Flip-Flops connected as shift register, then outputs QD, QC, QB, QA are given by: |
| A. | 1 and 2 only |
| B. | 2 and 3 only |
| C. | 1, 2 and 3 |
| D. | none of these |
| Answer» E. | |
| 5557. |
An FM transmitter delivers 80W to a load of 30 W when no modulation is present. The carrier is now frequency modulated by a single sinusoidal signal and the peak frequency deviation is so adjusted to make the amplitude of the second sideband is zero in the given output.J0(0, 0) = 1, J0(2, 4) = 0, J0(3.8) = - 0.4, J0(5.1)= - 0.1J1(2, 4) = 0.52, J1((3.8) = 0, J1(5.1) = - 0.33, J2(2.4) = 0.1J2(3.8)= 0.41, J2(5.1) = 0Power in the first order sidebands is : |
| A. | 5.12 W |
| B. | 21.78 W |
| C. | 2.56 W |
| D. | 16.81 W |
| Answer» C. 2.56 W | |
| 5558. |
To realize following function 'f', How many minimum number of 2 input NAND gates are required? |
| A. | 3 |
| B. | 6 |
| C. | 4 |
| D. | 10 |
| Answer» E. | |
| 5559. |
The capacitors C1, C3, C4 and C5 have a capacitance of 4 F each and the capacitor C2 has a capacitance of 10 F. The effective capacitance (in F) between the points X and Y will be |
| A. | 4 F |
| B. | 6 F |
| C. | 3 F |
| D. | 8 F |
| Answer» B. 6 F | |
| 5560. |
(9)11 x (9)13 x(9)15 = (?)16 |
| A. | 933 |
| B. | 2D9 |
| C. | 339 |
| D. | 9AB |
| Answer» C. 339 | |
| 5561. |
A speech signal, band limited to 4kHz and peak voltage varying between + 5V and - 5V is sampled at the Nyquist rate. Each sample is quantized and represented by 8 bits. Assuming the signal to be uniformly distributed between its peak values, the signal to noise ratio at the quantizer output is |
| A. | 156 dB |
| B. | 32 dB |
| C. | 48 dB |
| D. | 64 dB |
| Answer» D. 64 dB | |
| 5562. |
Two infinitely long wires carrying current are as shown in the figure below. One wire is in the y-z plane and parallel to the y-axis. The other wise is in the x-y plane and parallel to the x-axis. Which components of the resulting magnetic field are non-zero at the origin? |
| A. | x, y, z components |
| B. | x, y components |
| C. | y, z components |
| D. | x, z components |
| Answer» E. | |
| 5563. |
The Kirchoff's laws fail in which of the following circuits? |
| A. | Linear circuits |
| B. | Non-linear circuits |
| C. | Lumped parameters circuits |
| D. | Distributed parameters circuits |
| Answer» E. | |
| 5564. |
A black box has one of the elements our of R, L, C. when a 220 V a supply is connected the current supplied by source is I. when a 0.1 F capacitor is connected in parallel with the box, the current is 2I. The element is |
| A. | resistance |
| B. | inductance |
| C. | 0.1 F capacitance |
| D. | not identifiable on the basis of given data |
| Answer» C. 0.1 F capacitance | |
| 5565. |
In figure, the switch has been in closed position for a long time. At t = 0, the switch is opened. At t = 0+, the current R1 is |
| A. | 8 A |
| B. | 4 A |
| C. | 6 A |
| D. | 2 A |
| Answer» C. 6 A | |
| 5566. |
The expression for the resonant frequency 0 in the circuit shown |
| A. | 1/ |
| B. | <span class="root">LC</span> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/136-896-2.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/136-896-3.png"> |
| E. | none |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/136-896-2.png"> | |
| 5567. |
For a flexible cable, most suitable insulation is |
| A. | magnesium oxide |
| B. | glass fibre |
| C. | insulating tape |
| D. | polyvinyl chloride |
| Answer» E. | |
| 5568. |
If the peak value of output of a half wave rectifier is 100 V, the rms value is |
| A. | 100 V |
| B. | 50 V |
| C. | 70.7 V |
| D. | 35.35 V |
| Answer» C. 70.7 V | |
| 5569. |
Assertion (A): is not an LC function.Reason (R): The highest powers of numerator and denominator do not differ by 1. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the 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 | |
| 5570. |
Parallel wire transmission line is an example of |
| A. | lumped network |
| B. | distributed |
| C. | depend upon I/P signal strength |
| D. | power I/P |
| Answer» C. depend upon I/P signal strength | |
| 5571. |
In figure, . The values of C and R are |
| A. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-598-3.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-598-4.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-598-5.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-598-6.png"> |
| Answer» B. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/115-598-4.png"> | |
| 5572. |
A 2-terminal network consists of one of the RLC elements. The elements is connected to an ac supply. The current through the element is 1 A. When an inductor is inserted in series between the source and the element, the current through the element becomes 2 A. What is this element? |
| A. | A resistor |
| B. | An inductor |
| C. | A capacitor |
| D. | Cannot be single element |
| Answer» D. Cannot be single element | |
| 5573. |
Consider the following statements for a driving point function F(j ): Re F(j ) is an even function of and is 0 or positive for all values of .Im F(j ) is an even function of and is 0 or positive for all values of .Re F(j ) is an odd function of and is 0 or negative for all values of .Re F(s) = 0 for Re s = 0. Which one of the statements given above is/are correct? |
| A. | 1 only |
| B. | 1 and 4 |
| C. | 2, 2 and 4 |
| D. | 4 only |
| Answer» B. 1 and 4 | |
| 5574. |
Which of following is linear and bilateral parameter? |
| A. | Resistors |
| B. | Semi conductor diodes |
| C. | Electron tubes |
| D. | Transistor |
| Answer» B. Semi conductor diodes | |
| 5575. |
All network theorems of dc are applicable to ac also with different quantities taken as phasors. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5576. |
An ac circuit has two branches in parallel. The impedances of the two branches are equal. Their power factors are 0.8 lagging and 0.8 leading. The overall p.f. is |
| A. | 1 |
| B. | zero |
| C. | about 0.7 lagging |
| D. | about 0.7 leading |
| Answer» B. zero | |
| 5577. |
A h is the unit of quantity of electricity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5578. |
A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is |
| A. | 25 |
| B. | 50 |
| C. | 100 |
| D. | 200 |
| Answer» C. 100 | |
| 5579. |
For the system with given characteristic equation s5 + 4s4 + 8s3 + 8s2 + 7s + 4 = 0 The number of roots on left hand side, right hand side and imaginary axis are respectively. |
| A. | 3, 2, 0 |
| B. | 4, 0, 1 |
| C. | 3, 0, 2 |
| D. | 4, 1, 0 |
| Answer» E. | |
| 5580. |
The type of feedback in the following circuit diagram |
| A. | Voltage shunt |
| B. | Current-shunt |
| C. | Voltage series |
| D. | Current series |
| Answer» D. Current series | |
| 5581. |
Assertion (A): The number of basic loops is equal to number of links.Reason (R): The graph theory helps in choosing independent variables in circuit analysis. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the 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 | |
| 5582. |
In an R-L-C circuit, v(t) = 20 sin (314 t + 5 p/6) and i(t) = 10 sin (314 t + 2p/3). The p.f of the circuit is |
| A. | 0.5 lead |
| B. | 0.866 lag |
| C. | 0.866 lead |
| D. | 0.5 lead |
| Answer» C. 0.866 lead | |
| 5583. |
The maximum phase difference between the applied voltage and current in a RLC series current with finite values of R, L, C, and f can be |
| A. | less than 90 |
| B. | less than 45 |
| C. | 180 |
| D. | 30 |
| Answer» B. less than 45 | |
| 5584. |
If figure, I = 2A if R = 20 &ohm;. When R = 10 &ohm; current I is |
| A. | 1 A |
| B. | 2 A |
| C. | 2.5 A |
| D. | 3 A |
| Answer» C. 2.5 A | |
| 5585. |
A phasor is |
| A. | a line representing the magnitude and direction of an alternating quantity |
| B. | a line which represents the magnitude and phase of an alternating quantity |
| C. | an instrument used for measuring phases of an unbalanced 3-phase load |
| D. | a coloured tag or band for distinguishing between different phases of a 3-phase supply |
| Answer» C. an instrument used for measuring phases of an unbalanced 3-phase load | |
| 5586. |
The factor which will have least effect on the voltage at the load end of a two-wire supply circuit is |
| A. | length of the circuit |
| B. | whether supply frequency is 25 Hz or 50 Hz |
| C. | amount of load on the circuit |
| D. | cross-section of the circuit wires |
| Answer» C. amount of load on the circuit | |
| 5587. |
If a two port network is represented by an equivalent T network, the impedance of shunt arm in terms of ABCD parameters is equal to |
| A. | 1/C |
| B. | (A - 1)/C |
| C. | 1/B |
| D. | (D - 1)/C |
| Answer» B. (A - 1)/C | |
| 5588. |
The value of current read by ideal ammeter A in figure is __________ ampere. |
| A. | 0 |
| B. | 3 |
| C. | 2.5 |
| D. | 5 |
| Answer» E. | |
| 5589. |
In figure, I = 2A, then V = |
| A. | 5 V |
| B. | 3 V |
| C. | 2 V |
| D. | 1 V |
| Answer» D. 1 V | |
| 5590. |
The design of wave filter is based on characteristic impedance which is |
| A. | pure resistance |
| B. | pure reactance |
| C. | pure resistance in pass band and pure reactance in attenuation band |
| D. | pure reactance in pass band and pure resistance in attenuation band |
| Answer» D. pure reactance in pass band and pure resistance in attenuation band | |
| 5591. |
A system is said to be marginal stable if |
| A. | poles lies on Real axis |
| B. | zero lies on Real axis |
| C. | poles lies on Imaginary axis |
| D. | zeros lies on origin |
| Answer» D. zeros lies on origin | |
| 5592. |
Assertion (A): In state space analysis, capacitors are taken to be in tree.Reason (R): State variable analysis is very suitable for computer solution. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the 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 | |
| 5593. |
A parallel resonant circuit can be used |
| A. | as a high impedance |
| B. | to reject a small band of frequencies |
| C. | both (a) and (b) |
| D. | to amplify certain frequencies |
| Answer» D. to amplify certain frequencies | |
| 5594. |
Which of the following theorems enables a number of voltage (or current) sources to be combined directly into a single voltage (or current) source? |
| A. | Superposition theorem |
| B. | Compensation theorem |
| C. | Millman's theorem |
| D. | Thevenin's theorem |
| Answer» D. Thevenin's theorem | |
| 5595. |
If the numerator of Z(s) is one degree higher than denominator, Z(s) has a pole at infinity. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 5596. |
For the current wave i = 10 + 10 sin , the rms value is |
| A. | 10 A |
| B. | 12.247 A |
| C. | 20 A |
| D. | 14.14 A |
| Answer» C. 20 A | |
| 5597. |
In figure, I = |
| A. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/124-720-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/124-720-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/124-720-4.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/124-720-5.png"> |
| Answer» E. | |
| 5598. |
The impedance parameter z21 is |
| A. | transfer impedance at port 1 with port 2 open circuited |
| B. | transfer impedance at port 1 with port 2 short circuited |
| C. | transfer impedance at port 2 with port 1 open circuited |
| D. | transfer impedance at port 2 with port 1 short circuited |
| Answer» B. transfer impedance at port 1 with port 2 short circuited | |
| 5599. |
Measurement of an unknown voltage with a dc potentiometer loses its advantage of open circuit measurement when |
| A. | the primary circuit battery is changed |
| B. | standardization has to be done again to compensate for drifts |
| C. | voltage is larger than range of the potentiometer |
| D. | range reduction by a factor of 10 is employed |
| Answer» D. range reduction by a factor of 10 is employed | |
| 5600. |
Assertion (A): A complicated waveform can be replaced by sum or difference of two or more waveforms.Reason (R): The method of superposition is applicable only to linear systems. |
| A. | Both A and R are true and R is correct explanation of A |
| B. | Both A and R are true and R is not the 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 and R is not the correct explanation of A | |