MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1800 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1701. |
Assertion (A): The function is not positive real.Reason (R): The degrees of numerator and denominator differ by 2 |
| 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 | |
| 1702. |
An infinite ladder is constructed with 1 Ω and 2 Ω resistors shown below. |
| A. | 8.18 A |
| B. | 0 |
| C. | 0.375 |
| D. | can't determined |
| Answer» D. can't determined | |
| 1703. |
If f(t) = δ(t), F(s) = |
| A. | |
| B. | |
| Answer» B. | |
| 1704. |
A two terminal black box contains one of the elements R, L, C. The black box is connected to 220 V as supply. The current is I, when a capacitance of 0.1 F is connected in series between the source and box, the current is 2I. The elements is |
| A. | resistance |
| B. | inductance |
| C. | capacitance of 0.5 F |
| D. | not identifiable form the given data |
| Answer» C. capacitance of 0.5 F | |
| 1705. |
During discharging a capacitor through a resistance, voltages across R and C are equal in magnitude. |
| A. | 1 |
| B. | |
| C. | always 0° |
| D. | between 0 and 180° |
| Answer» B. | |
| 1706. |
The current wave in figure is passed through 3 H inductor. The voltage across inductance during the period 2 < t < 3 seconds is |
| A. | 12 V |
| B. | - 12 V |
| C. | 6 V |
| D. | - 6 V |
| Answer» C. 6 V | |
| 1707. |
In ionic bonding, the valence electron is donated by one atom and accepted by the other atom. |
| A. | 1 |
| B. | |
| C. | Ia2 = Ia + Ib + Ic |
| Answer» B. | |
| 1708. |
In the figure circuit, V1 = 40 V. When R is 10 Ω. When R is zero, the value of V2 will be |
| A. | 40 V |
| B. | 30 V |
| C. | 20 V |
| D. | 10 V |
| Answer» B. 30 V | |
| 1709. |
A capacitor is needed for an ac circuit of 230 V, 50 Hz the peak voltage rating of the capacitor should be |
| A. | 230 V |
| B. | 0.5 x 230 V |
| C. | 2 x 230V |
| D. | 230/2V |
| Answer» D. 230/2V | |
| 1710. |
A source of angular frequency 1 rad sec has a source impedance consisting of 1 Ω resistance in series with 1 H inductance. The load that will obtained the maximum power transfer is |
| A. | 1 Ω resistance |
| B. | 1 Ω resistance in parallel with 1 H inductance |
| C. | 1 Ω resistance in series with 1 F capacitor |
| D. | 1 Ω resistance in parallel with 1 F capacitor |
| Answer» D. 1 Œ© resistance in parallel with 1 F capacitor | |
| 1711. |
The degree of the nodes 1, 2, 3, 4 is |
| A. | 2 |
| B. | 3 |
| C. | 2 for 1, 2, 3, and 3 for 4 |
| D. | all 3 |
| Answer» E. | |
| 1712. |
A series RLC circuit is at resonance at 200 Hz. If capacitance is increased to four times, the circuit will be in resonance at |
| A. | 200 Hz |
| B. | 400 Hz |
| C. | 100 Hz |
| D. | 800 Hz |
| Answer» D. 800 Hz | |
| 1713. |
Elements R, L, C are connected in parallel and excited by a dc current I. If iR, iL and iC are the currents through R, L, C respectively then at t = 0 |
| A. | iR > iL > iC |
| B. | iL > iR > iC |
| C. | iC = 0 |
| D. | iC = I |
| Answer» E. | |
| 1714. |
When two coupled coils of equal self inductance are cormected in series in one way the net inductance is 12 mH and when they are connected in the other way the net inductance is 4 mH. The maximum value of inductance when they are connected in parallel is |
| A. | 2 mH |
| B. | 3 mH |
| C. | 4 mH |
| D. | 6 mH |
| Answer» C. 4 mH | |
| 1715. |
In a circuit with capacitance connected to ac source, the rate of change of capacitor voltage is constant. |
| A. | 1 |
| B. | |
| C. | Both A and R are true and R is correct explanation of A |
| D. | Both A and R are true and R is not the correct explanation of A |
| Answer» B. | |
| 1716. |
If the time is counted from the instant when an ac wave is at its peak value, we get a |
| A. | sine wave |
| B. | cosine wave |
| C. | distorted sine wave |
| D. | none of the above |
| Answer» C. distorted sine wave | |
| 1717. |
For the two port of figure, z22 is |
| A. | 26/7 Ω |
| B. | 6/7 Ω |
| C. | 2/3 Ω |
| D. | 1 Ω |
| Answer» C. 2/3 Œ© | |
| 1718. |
In the circuit of figure the voltage across C at t = 0+ is |
| A. | 0 V |
| B. | 20 V |
| C. | very large |
| D. | 7.5 V |
| Answer» B. 20 V | |
| 1719. |
The capacity of a battery is expressed in terms of |
| A. | current |
| B. | voltage |
| C. | none of these |
| D. | current and voltage |
| Answer» D. current and voltage | |
| 1720. |
System function , For a signal sin 2t, the steady state response is |
| A. | 43678 |
| B. | ‚àû |
| C. | 0 |
| D. | 8 |
| Answer» D. 8 | |
| 1721. |
In figure, the current through 2 Ω resistance is |
| A. | zero |
| B. | -2A |
| C. | 2A |
| D. | 1A |
| Answer» B. -2A | |
| 1722. |
For 200V r.m.s. value triangular wave, the peak voltage will be |
| A. | 200 V |
| B. | 222 V |
| C. | 280 V |
| D. | 346 V |
| Answer» E. | |
| 1723. |
In a loss-free R-L-C circuit the transient current is |
| A. | oscillating |
| B. | square wave |
| C. | sinusoidal |
| D. | non-oscillating |
| Answer» D. non-oscillating | |
| 1724. |
In the given circuit, viewed from AB, the circuit can be reduced to an equivalent circuit as |
| A. | 5 volts source in series with 10 Ω resistor |
| B. | 7 volts source in series with 2.4 Ω resistor |
| C. | 15 volts source in series with 2.4 Ω resistor |
| D. | 1 volt source in series with 10 Ω resistor |
| Answer» C. 15 volts source in series with 2.4 Œ© resistor | |
| 1725. |
The response to sinusoidal excitation can be found by |
| A. | settings s = jω in the network function |
| B. | settings s = - jω in the network function |
| C. | taking inverse transform of network function |
| D. | none of the above |
| Answer» B. settings s = - jœâ in the network function | |
| 1726. |
If two network is connected in series-parallel connection then |
| A. | h = [ha] + [hb] |
| B. | [aa] + [bb] |
| C. | [Z] = [Za] - [Zb] |
| D. | none |
| Answer» B. [aa] + [bb] | |
| 1727. |
If A = 3 + j1 and B = 4 + j3, A - B = |
| A. | 8.062 ∠29.7° |
| B. | 10 ∠45° |
| C. | 2.236 ∠243.43° |
| D. | 6.72 ∠243.43° |
| Answer» D. 6.72 ‚à†243.43¬∞ | |
| 1728. |
A function f(t) = k eat is __________ for (a > 0). |
| A. | stable |
| B. | unstable |
| C. | marginal |
| D. | none |
| Answer» C. marginal | |
| 1729. |
In a resistive ac circuit, the current __________ the voltage by __________ . |
| A. | lags, 90° |
| B. | lags, 45° |
| C. | lags, 0° |
| D. | leads 90° |
| Answer» D. leads 90¬∞ | |
| 1730. |
A two branch parallel circuit has a 20 Ω resistance and 1 H inductance in one branch and a 100 μF capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is |
| A. | 500 Ω |
| B. | 50 Ω |
| C. | 20 Ω |
| D. | 5 Ω |
| Answer» B. 50 Œ© | |
| 1731. |
The circuit in figure will act as ideal current source with respect to terminals A and B when frequency is |
| A. | 0 |
| B. | 1 rad/sec |
| C. | 4 rad/sec |
| D. | 16 rad/sec |
| Answer» C. 4 rad/sec | |
| 1732. |
For any given two port network, any parameter set can be determined from measurements made at the two ports. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1733. |
The polar plot of P (jω) = 45° as ω varies from -∞ to ∞ is |
| A. | a straight line parallel to x-axis |
| B. | a straight line parallel to y-axis |
| C. | a line passing through origin and inclined at 45° |
| D. | a line in first quadrant passing through origin and inclined at 45° to positive x-axis |
| Answer» C. a line passing through origin and inclined at 45¬∞ | |
| 1734. |
An ac network has two sources of the same frequency. The currents in one branch when the sources act independently are 10 ∠30° A and 10 ∠60° A. When both sources act, the current in the branch should be |
| A. | 19.32 ∠45° |
| B. | 15 ∠45° |
| C. | 20 ∠45° |
| D. | zero |
| Answer» B. 15 ‚à†45¬∞ | |
| 1735. |
A dielectric should have poor heat conductivity. |
| A. | 1 |
| B. | |
| C. | sensitivity |
| D. | attenuation |
| Answer» C. sensitivity | |
| 1736. |
If f(t) = r (t - a), F(s) = |
| A. | e-as/s2 |
| B. | a/(s + a) |
| C. | 1/(s + a) |
| D. | e-as/s |
| Answer» B. a/(s + a) | |
| 1737. |
The network has 10 nodes and 17 branches. The number of different node power voltages would be |
| A. | 7 |
| B. | 9 |
| C. | 10 |
| D. | 45 |
| Answer» C. 10 | |
| 1738. |
The function of a choke in a fluorescent lamp is |
| A. | at the time of starting only |
| B. | during the working of time but not at starting time |
| C. | both at the time of starting and during working |
| D. | none of the above |
| Answer» D. none of the above | |
| 1739. |
Which of the following is correct for a driving point functions? |
| A. | The real parts of all poles must be negative |
| B. | The real parts of all poles and zeros must be negative |
| C. | The real parts of all poles and zeros must be negative or zero |
| D. | The real parts of all zeros must be negative |
| Answer» D. The real parts of all zeros must be negative | |
| 1740. |
If the L.T. of the voltage across a capacitor of value 1/3 F is , then the value of the current through the capacitor at t = 0+ is |
| A. | 0 |
| B. | 1 |
| C. | 43525 |
| D. | ‚àû |
| Answer» D. ‚àû | |
| 1741. |
A 50 Hz current has an amplitude of 10 A. The rate of change of current at t = 0.005 after i = 0 and is increasing is |
| A. | 2221.44 A/s |
| B. | 0 |
| C. | - 2221.44 A/s |
| D. | - 3141.6 A/s |
| Answer» C. - 2221.44 A/s | |
| 1742. |
An RL impedance function is to be synthesised in second Foster form. The proper function to be expanded is |
| A. | Z(s) |
| B. | sZ(s) |
| C. | 1/Z(s) |
| D. | Z(s)/s |
| Answer» E. | |
| 1743. |
In a network containing resistances, reactances the root of the characteristic equation give for the circuit |
| A. | the forced response |
| B. | the total response |
| C. | the natural response |
| D. | the damped response |
| Answer» D. the damped response | |
| 1744. |
The purpose of earthing electric appliances is |
| A. | to provide safety against shock |
| B. | to ensure that appliance works satisfactorily |
| C. | to ensure that appliance gets full voltage |
| D. | all of the above |
| Answer» B. to ensure that appliance works satisfactorily | |
| 1745. |
Special circuits using neon tubes, contact relays and capacitors are used in many domestic appliances. The role of capacitor in figure is to |
| A. | reduce power loss |
| B. | function as resistor when relay is on |
| C. | delay the operation of the contact relay after switching on |
| D. | open circuit the relay terminals |
| Answer» D. open circuit the relay terminals | |
| 1746. |
The Voltage e0 in the figure, |
| A. | 2 V |
| B. | 4 V |
| C. | 4/3 V |
| D. | 8 V |
| Answer» C. 4/3 V | |
| 1747. |
The dual of a loop is |
| A. | twig |
| B. | node pan |
| C. | mesh |
| D. | tree |
| Answer» E. | |
| 1748. |
In figure, the switch is closed at t = 0. After some time i = 6A and rate of change of current was 4A/s. The value of inductor is |
| A. | 1 H |
| B. | 1.5 H |
| C. | indeterminate |
| D. | 0.5 H |
| Answer» E. | |
| 1749. |
In a linear circuit, the superposition principle can be applied to calculate the |
| A. | voltage and power |
| B. | voltage and current |
| C. | current and power |
| D. | voltage, current and power |
| Answer» C. current and power | |
| 1750. |
A particular current is made up of two components 10A dc and sinusoidal current of peak value 14.14A. The average of resultant current is |
| A. | zero |
| B. | 24.14A |
| C. | 10A |
| D. | 14.14A |
| Answer» D. 14.14A | |