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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.
| 601. |
In the circuit shown in figure, for different values of R, the values of V and I are given. Other elements remaining the same. when R = ∞, V = 5 volt1. R = 0, I = 2.5 A2. R = 3 Ω, the value of V is given by |
| A. | 1 V |
| B. | 2 V |
| C. | 3 V |
| D. | 5 V |
| Answer» D. 5 V | |
| 602. |
For the three coupled coils shown in figure, KVL equation is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 603. |
In figure, the current iL at t = ∞ is |
| A. | I |
| B. | 0 |
| C. | IR/L |
| D. | IL/RC |
| Answer» B. 0 | |
| 604. |
A resistance coil has self inductance L, resistance R and capacitance C. The impedance across the coil is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 605. |
The driving-point impedance Z(s) of a network has a pole-zero locations as shown in the figure. If Z(0) = 3, then Z (s) is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 606. |
Z(c) for the network shown in the figure is given by following equation. The value of C and R are, respectively |
| A. | 1/6 F and 4 Ω |
| B. | 2/9 F and 9/2 Ω |
| C. | 2/3 F and 1/2 Ω |
| D. | 1/2 F and 1 Ω |
| Answer» B. 2/9 F and 9/2 Ω | |
| 607. |
Which of the following is the passive element? |
| A. | Capacitance |
| B. | Ideal current source |
| C. | Ideal voltage source |
| D. | All of the above |
| Answer» B. Ideal current source | |
| 608. |
“In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources”.The above statement is associated with |
| A. | Thevenin’s theorem |
| B. | Norton’s theorem |
| C. | Superposition theorem |
| D. | None of the above |
| Answer» D. None of the above | |
| 609. |
“In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch”. The above statement is associated with |
| A. | Compensation theorem |
| B. | Superposition theorem |
| C. | Reciprocity theorem |
| D. | None of the above |
| Answer» D. None of the above | |
| 610. |
“Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen terminals of the load”. The above statement is associated with |
| A. | Millman’s theorem |
| B. | Thevenin’s theorem |
| C. | Superposition theorem |
| D. | Maximum power transfer theorem |
| Answer» E. | |
| 611. |
A delta circuit has each element of value R/2. The equivalent elements of star circuit with be |
| A. | RIG |
| B. | R/3 |
| C. | 2R |
| D. | 3R |
| Answer» B. R/3 | |
| 612. |
This mention statement is associated with“Any number of current sources in parallel may be replaced by a single current source whose current is the algebraic sum of individual currents and source resistance is the parallel combination of individual source resistances”. |
| A. | Thevenin’s theorem |
| B. | Millman’s theorem |
| C. | Maximum power transfer theorem |
| D. | None of the above |
| Answer» C. Maximum power transfer theorem | |
| 613. |
If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is |
| A. | 10 Q |
| B. | 20 Q |
| C. | 30 Q |
| D. | 40 Q |
| Answer» D. 40 Q | |
| 614. |
In Thevenin’s theorem, to find Z |
| A. | All independent current sources are short circuited and independent voltage sources are open circuited |
| B. | All independent voltage sources are open circuited and all independent current sources are short circuited |
| C. | All independent voltage and current sources are short circuited |
| D. | All independent voltage sources are short circuited and all independent current sources are open circuited |
| Answer» E. | |
| 615. |
A passive network is one which contains |
| A. | Only variable resistances |
| B. | Only some sources of e.m.f. in it |
| C. | Only two sources of e.m.f. in it |
| D. | No source of e.m.f. in it |
| Answer» E. | |
| 616. |
Kirchhoff’s current law is applicable to only |
| A. | Junction in a network |
| B. | Closed loops in a network |
| C. | Electric circuits |
| D. | Electronic circuits |
| Answer» B. Closed loops in a network | |
| 617. |
This mention statement is associated with“In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources”. |
| A. | Thevenin’s theorem |
| B. | Norton’s theorem |
| C. | Superposition theorem |
| D. | None of the above |
| Answer» D. None of the above | |
| 618. |
In a series parallel circuit, any two resistances in the same current path must be in |
| A. | Series with each other |
| B. | Parallel with each other |
| C. | Series with the voltage source |
| D. | Parallel with the voltage source |
| Answer» B. Parallel with each other | |
| 619. |
Kirchhoff s current law states that |
| A. | Net current flow at the junction is positive |
| B. | Hebraic sum of the currents meeting at the junction is zero |
| C. | No current can leave the junction without some current entering it |
| D. | Total sum of currents meeting at the junction is zero |
| Answer» C. No current can leave the junction without some current entering it | |
| 620. |
Efficiency of power transfer when maximum transfer of power c xerosis |
| A. | 100% |
| B. | 80% |
| C. | 75% |
| D. | 50% |
| Answer» E. | |
| 621. |
Which of the following is non-linear circuit parameter? |
| A. | Inductance |
| B. | Condenser |
| C. | Wire wound resistor |
| D. | Transistor |
| Answer» B. Condenser | |
| 622. |
A nonlinear network does not satisfy |
| A. | Superposition condition |
| B. | Homogeneity condition |
| C. | Both homogeneity as well as superposition condition |
| D. | Homogeneity, superposition and associative condition |
| Answer» D. Homogeneity, superposition and associative condition | |
| 623. |
While calculating Rth in Thevenin’s theorem and Norton equivalent |
| A. | All independent sources are made dead |
| B. | Only current sources are made dead |
| C. | Only voltage sources are made dead |
| D. | All voltage and current sources are made dead |
| Answer» B. Only current sources are made dead | |
| 624. |
Millman’s theorem yields |
| A. | Equivalent resistance |
| B. | Equivalent impedance |
| C. | Equivalent voltage source |
| D. | Equivalent voltage or current source |
| Answer» E. | |
| 625. |
Kirchhoff’s law is applicable to |
| A. | Passive networks only |
| B. | A.C. circuits only |
| C. | D.C. circuits only |
| D. | Both A.C. as well D.C. circuits |
| Answer» E. | |
| 626. |
Thevenin resistance Rth is found |
| A. | by removing voltage sources along with their internal resistances |
| B. | by short-circuiting the given two terminals |
| C. | between any two ‘open’ terminals |
| D. | between same open terminals as for Etk |
| Answer» E. | |
| 627. |
To determine the polarity of the voltage drop across a resistor, it is necessary to know |
| A. | Value of current through the resistor |
| B. | Direction of current through the resistor |
| C. | Value of resistor |
| D. | E.m.f. in the circuit |
| Answer» C. Value of resistor | |
| 628. |
Kirchhoff’s voltage law applies to circuits with |
| A. | Nonlinear elements only |
| B. | Linear elements only |
| C. | Linear, nonlinear, active and passive elements |
| D. | Linear, nonlinear, active, passive, time varying as wells as time-invariant elements |
| Answer» E. | |
| 629. |
Kirchhoff’s voltage law is related to |
| A. | Junction currents |
| B. | Battery e.m.f. |
| C. | IR drops |
| D. | Both B and C |
| Answer» E. | |
| 630. |
For a voltage source |
| A. | Terminal voltage is always lower than source e.m.f. |
| B. | Terminal voltage cannot be higher than source e.m.f. |
| C. | The source e.m.f. and terminal voltage are equal |
| D. | None of these |
| Answer» C. The source e.m.f. and terminal voltage are equal | |
| 631. |
An ideal voltage source should have |
| A. | Large value of e.m.f. |
| B. | Small value of e.m.f. |
| C. | Zero source resistance |
| D. | Infinite source resistance |
| Answer» D. Infinite source resistance | |
| 632. |
Superposition theorem can be applied only to circuits having |
| A. | Resistive elements |
| B. | Passive elements |
| C. | Nonlinear elements |
| D. | Linear bilateral elements |
| Answer» E. | |
| 633. |
A linear resistor having 0 < R < °o is a |
| A. | current controlled resistor |
| B. | voltage controlled resistor |
| C. | both current controlled and voltage controlled resistor |
| D. | none of the above |
| Answer» D. none of the above | |
| 634. |
The circuit has resistors, capacitors and semiconductor diodes. The circuit will be known as |
| A. | Nonlinear circuit |
| B. | Linear circuit |
| C. | Bilateral circuit |
| D. | None of the above |
| Answer» B. Linear circuit | |
| 635. |
Which of the following is a bilateral element? |
| A. | Constant current source |
| B. | Constant voltage source |
| C. | Capacitance |
| D. | None of the above |
| Answer» D. None of the above | |
| 636. |
Between the branch voltages of a loop the Kirchhoff's voltage law imposes |
| A. | Nonlinear constraints |
| B. | Linear constraints |
| C. | No constraints |
| D. | None of the above |
| Answer» C. No constraints | |
| 637. |
Application of Norton’s theorem to a circuit yields |
| A. | Equivalent current source and impedance in series |
| B. | Equivalent current source and impedance in parallel |
| C. | Equivalent impedance |
| D. | Equivalent current source |
| Answer» C. Equivalent impedance | |
| 638. |
The concept on which Superposition theorem is based is |
| A. | Reciprocity |
| B. | Duality |
| C. | Non-linearity |
| D. | Linearity |
| Answer» E. | |
| 639. |
Which of the following is not a nonlinear element ? |
| A. | Gas diode |
| B. | Heater coil |
| C. | Tunnel diode |
| D. | Electric arc |
| Answer» C. Tunnel diode | |
| 640. |
According to Kirchhoff’s voltage law, the algebraic sum of all IR drops and e.m.f. in any closed loop of a network is always |
| A. | Negative |
| B. | Positive |
| C. | Determined by battery e.m.f. |
| D. | Zero |
| Answer» E. | |
| 641. |
Two network said to be dual to each other |
| A. | if node equation of both is same |
| B. | neither mesh equation nor node equation is same |
| Answer» B. neither mesh equation nor node equation is same | |
| 642. |
When two port networks are connected in cascade, it is more convenient to use hybrid parameters. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 643. |
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 | |
| 644. |
Two voltages are 50 ∠0 V and 75 ∠ - 60° V. The sum of these voltages is |
| A. | 109 ∠ - 60° V |
| B. | 109 ∠ - 25° V |
| C. | 109 ∠ - 36.6° V |
| D. | 100 ∠ - 50.1° V |
| Answer» D. 100 ‚à† - 50.1¬∞ V | |
| 645. |
If the diameter of a wire is doubled, the current carrying capacity of the wire becomes |
| A. | half |
| B. | twice |
| C. | four times |
| D. | one-fourth |
| Answer» D. one-fourth | |
| 646. |
In one time constant, the current in a circuit reaches __________ percent of its final value. |
| A. | 10 |
| B. | 37 |
| C. | 63 |
| D. | 85 |
| Answer» D. 85 | |
| 647. |
An AC circuit has two branches in parallel. The current in one branch is 5 A. Then the current source |
| A. | must be less than 5 A |
| B. | must be more than 5 A |
| C. | may be equal or more or less than 5 A |
| D. | 0.20833333333333 |
| Answer» D. 0.20833333333333 | |
| 648. |
The first and the last critical frequencies (singularities) of a driving point impedance function of a passive network having two kind of elements, are a pole and a zero respectively. The above property will be satisfied by |
| A. | RL network only |
| B. | RC network only |
| C. | LC network only |
| D. | RC as well as RL network |
| Answer» C. LC network only | |
| 649. |
For a reactance function H(s), the slope dH (jω)/dω is |
| A. | always negative |
| B. | either 0 or positive |
| Answer» C. | |
| 650. |
In the circuit, shown the current I marked is given by |
| A. | 4.44 A |
| B. | 0.083333333333333 |
| Answer» B. 0.083333333333333 | |