MCQOPTIONS
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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.
| 1601. |
A nickel cadmium cell is an alkaline cell. |
| A. | 1 |
| B. | |
| C. | z parameters |
| D. | h parameters |
| Answer» B. | |
| 1602. |
In figure the open circuit emf is |
| A. | 15 V |
| B. | 1.45 V |
| C. | 1.475 V |
| D. | 1.485 V |
| Answer» D. 1.485 V | |
| 1603. |
Zinc oxide is a non-linear resistance. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1604. |
When three 100 K, ± 10% fixed resistors of 1/4 W Power rating are connected in parallel, the resulting 33 K resistor will have a tolerance specification and power rating of |
| A. | ± 10% and 3/4 W respectively |
| B. | ± 10% and 1/12 W respectively |
| C. | ± 3.3.% and 3/4 W respectively |
| D. | ± 30% and 3/4 W respectively |
| Answer» B. ¬± 10% and 1/12 W respectively | |
| 1605. |
Two impedances are connected in series. Three voltmeters are connected, one across each impedance and one across combination. The readings of all the three are equal. The phase angle between voltages across the two impedances is |
| A. | 30° |
| B. | 60° |
| C. | 90° |
| D. | 120° |
| Answer» E. | |
| 1606. |
It two voltages are v1 = 100 sin (ωt - 30°) and v2 = cos ω t then |
| A. | v1 is leading v2 by 30° |
| B. | v2 is leading v1 by 30° |
| C. | v2 is leading v1 by 60° |
| D. | v1 is leading v2 by 60° |
| Answer» D. v1 is leading v2 by 60¬∞ | |
| 1607. |
The current wave shape shown in figure (1) is applied to a circuit element. The voltage across the element is shown in figure (2). The element is |
| A. | R |
| B. | L |
| C. | C |
| D. | Semiconductor |
| Answer» D. Semiconductor | |
| 1608. |
A two branch parallel tuned circuits has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. The bandwidth is 200 radians/sec. A load of resistance RL is connected in parallel. The new bandwidth will be |
| A. | 200 rad/sec |
| B. | more than 200 rad/sec |
| C. | less than 200 rad/sec |
| D. | 200 rad/sec or less |
| Answer» C. less than 200 rad/sec | |
| 1609. |
A series R, L, C circuit has R = 2Ω, L = 1H, C = 1 μF. It is connected to an ac variable frequency source of peak voltage 10 V. At resonance the power supplied by the source will be |
| A. | 50 Ω |
| B. | 25 Ω |
| C. | 12.5 Ω |
| D. | 6.25 Ω |
| Answer» C. 12.5 Œ© | |
| 1610. |
Which one of the following statements is not a property of RL driving point impedance? |
| A. | The first critical frequency at the origin is a zero |
| B. | The last critical frequency is a pole |
| C. | The impedance at S = ‚àû always less than the impedance at S = zero |
| D. | The slope of the impedance curve is positive at all points |
| Answer» D. The slope of the impedance curve is positive at all points | |
| 1611. |
The phase difference between them is __________ degrees. |
| A. | 15 |
| B. | 50 |
| C. | 60 |
| D. | 105 |
| Answer» E. | |
| 1612. |
In a series RLC circuit the dB level of currents at half power frequencies as compared to current at resonance is |
| A. | 3 |
| B. | -3 |
| C. | 0.5 |
| D. | -0.5 |
| Answer» C. 0.5 | |
| 1613. |
In figure, A is ideal ammeter having zero resistance. It will read __________ ampere. |
| A. | 2 |
| B. | 2.5 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 1614. |
As per BIS, solid insulators are classified into 6 categories. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1615. |
In figure the phase plot |
| A. | will be 90° at ω = 0 and 0° at ω = ∞ |
| B. | will be 0° at ω = 0 and 90° at ω = ∞ |
| C. | will be 45° at ω = 0 and 0° at ω = ∞ |
| D. | will be 45° at ω = 0 and 90° at ω = ∞ |
| Answer» B. will be 0¬∞ at œâ = 0 and 90¬∞ at œâ = ‚àû | |
| 1616. |
Pick the correct statement |
| A. | Delta connection draws same current as star connection |
| B. | Delta connection draws 3 times as much current as star connection |
| C. | Delta connection draws of the current of star connection |
| D. | Delta connection draws of the current of delta connection |
| Answer» E. | |
| 1617. |
In figure, the current I4 is |
| A. | 10 ∠0 |
| B. | 5 ∠90° |
| C. | 5 ∠270° |
| D. | 10 ∠90° |
| Answer» C. 5 ‚à†270¬∞ | |
| 1618. |
In the analogy between electric and magnetic circuits permeability is analogous to |
| A. | resistivity |
| B. | conductivity |
| C. | electric field intensity |
| D. | current density |
| Answer» C. electric field intensity | |
| 1619. |
In the circuit of figure the switch is closed at t = 0, At t = 0+ this current through inductance is |
| A. | 0 |
| B. | 0.41666666666667 |
| C. | 6.67 A |
| D. | 5.1 A |
| Answer» B. 0.41666666666667 | |
| 1620. |
The V-i relation for a varistor is |
| A. | i = kvn |
| B. | v = kin |
| C. | i = kv3 |
| D. | v = ki3 |
| Answer» B. v = kin | |
| 1621. |
In the two ports network shown in the figure, Z12 and Z21 are, respectively |
| A. | re and βr0 |
| B. | 0 and - βr0 |
| C. | 0 and βr0 |
| D. | re and - βr0 |
| Answer» C. 0 and Œ≤r0 | |
| 1622. |
Volt is equivalent to |
| A. | joule/coulomb |
| B. | joule/watt |
| C. | joule/ampere |
| D. | joule/volt |
| Answer» B. joule/watt | |
| 1623. |
The pole of a reactive function |
| A. | lie on jω axis only |
| B. | lie on negative real axis only |
| C. | may lie anywhere on s plane |
| D. | lie on jω axis or on negative real axis |
| Answer» B. lie on negative real axis only | |
| 1624. |
If A = 3 + j1, A4 = |
| A. | 3.16 ∠18.4° |
| B. | 100 ∠73.72° |
| C. | 100 ∠18.4° |
| D. | 3.16 ∠73.22° |
| Answer» C. 100 ‚à†18.4¬∞ | |
| 1625. |
A two port network is symmetrical if |
| A. | z11 z12 - z12 z21 = 1 |
| B. | AD - BC = 1 |
| C. | h11 h22 - h12 h41 = 1 |
| D. | y11 y22 = y12 y21 = 1 |
| Answer» D. y11 y22 = y12 y21 = 1 | |
| 1626. |
In the voltage equation v = 500 e-5t sin (2p 50t), the frequency is |
| A. | 2p x 50 Hz |
| B. | 50 Hz |
| C. | |
| Answer» C. | |
| 1627. |
In figure, the switch is closed at t = 0 when current through inductor is 6 A, the rate of change of current through resistor is 6 A/s. The value of L is |
| A. | 1 H |
| B. | 2 H |
| C. | 3 H |
| D. | 4 H |
| Answer» C. 3 H | |
| 1628. |
A capacitor does not allow sudden changes |
| A. | in currents |
| B. | in voltage |
| C. | in both current and voltage |
| D. | neither of two |
| Answer» C. in both current and voltage | |
| 1629. |
In the figure shown, A1, A2, A3 are identical Ammeters. If A1 and A3 read 5 and 13 A respectively, reading of A2 will be |
| A. | 8 |
| B. | 13 A |
| C. | 18 |
| D. | 0 |
| Answer» E. | |
| 1630. |
A planar graph has 6 nodes and 7 branches. The number of meshes in the dual graph is |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 6 |
| Answer» B. 3 | |
| 1631. |
For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is |
| A. | 100 Ω |
| B. | 50 Ω |
| C. | 25 Ω |
| D. | 10 Ω |
| Answer» E. | |
| 1632. |
A series RLC circuit has a resonant frequency of 1000 Hz. The maximum voltage across C is likely to occur at a frequency of about |
| A. | 1000 Hz |
| B. | 2000 Hz |
| C. | 1025 Hz |
| D. | 975 Hz |
| Answer» E. | |
| 1633. |
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 | |
| 1634. |
In figure, the current I is |
| A. | 0.041666666666667 |
| B. | 0.083333333333333 |
| C. | 0.16666666666667 |
| D. | 0.33333333333333 |
| Answer» B. 0.083333333333333 | |
| 1635. |
A source is delivering maximum power to a resistance through a network. The ratio of power delivered to the source power, |
| A. | is always 0.5 |
| B. | may be 0.54 or less |
| C. | may be 0.5 or less |
| D. | may be 0.5 or more |
| Answer» C. may be 0.5 or less | |
| 1636. |
In figure, V1 = 40 V when R = 10 Ω, if R = 0, V2 will be |
| A. | 40 V |
| B. | 30 V |
| C. | 20 V |
| D. | 10 V |
| Answer» D. 10 V | |
| 1637. |
Kirchoff's laws are applicable to |
| A. | dc only |
| B. | ac sinusoidal wave only |
| C. | dc and ac sinusoidal waves |
| D. | all wave shapes |
| Answer» E. | |
| 1638. |
In a Hurwitz polynomial |
| A. | all coefficients are non-negative |
| B. | the coefficients may be positive or negative |
| C. | all coefficients are negative |
| D. | all coefficients are non-negative and all zeros should be either in left half plane or simple on the imaginary axis |
| Answer» E. | |
| 1639. |
I = dq/dt. |
| A. | 1 |
| B. | |
| C. | 2.2 A |
| D. | less than 2.2 A |
| Answer» B. | |
| 1640. |
A network has two branches in parallel. One branch contains impedance Z1 and the other branch has impedance Z2. If it is fed from an ac voltage V of frequency f, the current through Z1 depends, on |
| A. | V, Z1, Z2 |
| B. | V, Z1 |
| C. | Z1, Z2 |
| D. | V, Z1, f |
| Answer» E. | |
| 1641. |
When cells having different emfs are connected in parallel, a circulating current flows. |
| A. | 1 |
| B. | |
| C. | 0.6 T |
| D. | more than 0.6 T |
| Answer» B. | |
| 1642. |
For a high pass filter attenuation = 0 at f = 0. |
| A. | 1 |
| B. | |
| C. | 1000 W |
| D. | 500 W |
| Answer» C. 1000 W | |
| 1643. |
A system described by the following differential equation is initially rest for input x(t) = 2 u(t), the output y(t) is |
| A. | (1 - 2e-t + e-2t) u(t) |
| B. | (1 + 2e-t + 2e-2t) u(t) |
| C. | (0.5 + e-t + 1.5e-2t) u(t) |
| D. | (0.5 + 2e-t + 2e-2t) u(t) |
| Answer» B. (1 + 2e-t + 2e-2t) u(t) | |
| 1644. |
The resistance of a 230 V, 100 W lamp is |
| A. | 529 Ω |
| B. | 2300 Ω |
| C. | 5290 Ω |
| D. | 23 Ω |
| Answer» B. 2300 Œ© | |
| 1645. |
Two similar coils have self inductance of 1 mH each. Coefficient of coupling is 0.5. The mutual inductance M is |
| A. | 0.25 mH |
| B. | 0.5 mH |
| C. | 0.707 mH |
| D. | 1 mH |
| Answer» C. 0.707 mH | |
| 1646. |
Assertion (A): Charge is dual of flux.Reason (R): Short circuit is dual of open circuit. |
| 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 | |
| 1647. |
In figure the voltage drop across the 10 Ω resistance is 10 V. The resistance R |
| A. | is 6 Ω |
| B. | is 8 Ω |
| C. | is 4 Ω |
| D. | cannot be found |
| Answer» B. is 8 Œ© | |
| 1648. |
In the above circuit, if the power dissipated in the 6 Ω resistor is zero then V is |
| A. | 20 2∠ 45° |
| B. | 20 ∠ 30° |
| C. | 20 ∠ 45° |
| D. | 20 2∠ 30° |
| Answer» B. 20 ‚à† 30¬∞ | |
| 1649. |
Peak to peak value of a sine wave is equal to twice the peak value |
| A. | 1 |
| B. | |
| C. | 0.5 Hz |
| D. | 5 Hz |
| Answer» C. 0.5 Hz | |
| 1650. |
The colour on the extreme left in general purpose fixed resistors represents |
| A. | first significant digit |
| B. | tolerance |
| C. | wattage rating |
| D. | voltage rating |
| Answer» B. tolerance | |