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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.
| 501. |
For the two port network of figure, the voltage transfer ratio in s domain is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 502. |
In a series RLC circuit excited by e = Em sin ωt is seen that LC < 1/ω². Then |
| A. | I lags E |
| B. | I leads E |
| C. | I leads E are in phase |
| D. | voltage across L and C are equal |
| Answer» C. I leads E are in phase | |
| 503. |
The Laplace transforms of voltage function shown in figure is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 504. |
In figure, a voltmeter of internal resistance 1200 Ω is connected across 600 Ω resistance and it reads 5 V. The value of R is |
| A. | 1200 Ω |
| B. | 2400 Ω |
| C. | 3600 Ω |
| D. | 7200 Ω |
| Answer» C. 3600 Ω | |
| 505. |
To find the current in a 20 Ω resistance connected in a circuit, Norton's theorem is used. IN = 7.5 A. The current though 20 Ω resistance. |
| A. | is 7.5 A |
| B. | is less than 7.5 A |
| C. | may be 7.5 A or less |
| D. | may be 7.5 A or more or less |
| Answer» C. may be 7.5 A or less | |
| 506. |
Two voltages are v1= 100 sin (ωt + 15°) and v2 = 60 cosωt, then |
| A. | v1 is leading v2 by 15° |
| B. | v1 is leading v2 by 75° |
| C. | v2 is leading v1 by 75° |
| D. | v2 is lagging v1 by 15° |
| Answer» D. v2 is lagging v1 by 15° | |
| 507. |
In figure, the short circuit current through terminal AB will be |
| A. | 1.5 A |
| B. | 3 A |
| C. | 2 A |
| D. | 1 A |
| Answer» E. | |
| 508. |
If admittance of a circuit is defined by following equation, then at resonance |
| A. | mp = ql |
| B. | mq = pl |
| C. | ml = pq |
| D. | none |
| Answer» B. mq = pl | |
| 509. |
If operator 'a' = 1 ∠120° then (1 - a²) = |
| A. | 1 ∠ - 30° |
| B. | 1 ∠ 30° |
| C. | 1 ∠ - 60° |
| D. | 1 ∠60° |
| Answer» B. 1 ∠ 30° | |
| 510. |
The circuit whose properties are same in either direction is known as |
| A. | unilateral circuit |
| B. | bilateral circuit |
| C. | irreversible circuit |
| D. | reversible circuit |
| Answer» C. irreversible circuit | |
| 511. |
A conductor has a cylindrical shape with a diameter d. Its resistance is 2 Ω. It is recast into a cylindrical conductor of diameter 0.3d. The resistance of new conductor is likely to be |
| A. | less than 2 Ω |
| B. | less than 0.6 Ω |
| C. | between 2 and 100 Ω |
| D. | more than 100 Ω |
| Answer» E. | |
| 512. |
In a series R-L circuit when excited by a 1 volt battery the current is 1 - e¯ᵗ. If it is excited by a source 2 sin t, the current will be |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 513. |
A resistor is rated at 0.75 watt, 1 kΩ. Its current rating is |
| A. | 1 mA |
| B. | 27.386 mA |
| C. | 1.268 mA |
| D. | 5.393 mA |
| Answer» C. 1.268 mA | |
| 514. |
In the circuit shown in the figure the power dissipated in 30 Ω resistor will be maximum if the value of R is |
| A. | 30 Ω |
| B. | 10 Ω |
| C. | 9 Ω |
| D. | zero |
| Answer» E. | |
| 515. |
Paley Wiener criterion states that a necessary and sufficient condition for an amplitude function |H(jω)| to be causal is that |
| A. | True |
| B. | False |
| C. | May be true or False |
| D. | Can't say |
| Answer» B. False | |
| 516. |
The following transfer function represents |
| A. | a high pass filter |
| B. | band elimination filter |
| C. | a resonator |
| D. | an all pass filter |
| Answer» B. band elimination filter | |
| 517. |
Consider the following two statements: |
| 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 | |
| 518. |
In ZRC (s) = 0 at s =∞, the last element in second Foster realization will be |
| A. | R |
| B. | C |
| C. | R and C in series |
| D. | R and C in parallel |
| Answer» C. R and C in series | |
| 519. |
Choose the correct option, where H(s) is transfer function, Z(s) is driving point impedance functions |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 520. |
A series RL circuit is switched on to an impulse. A δ(t) at t = 0. Then |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't Say |
| Answer» B. False | |
| 521. |
Which one is correct statement? 1. Circuit is always open2. Network is always open3. Circuit is always closed4. Network is always closed |
| A. | 1, 2 |
| B. | 2, 3 |
| C. | 3, 4 |
| D. | 1, 4 |
| Answer» C. 3, 4 | |
| 522. |
For the time domain response shown in figure the pole |
| A. | lies in left half plane |
| B. | lies in right half plane |
| C. | lies at origin |
| D. | may be complex or imaginary |
| Answer» D. may be complex or imaginary | |
| 523. |
Laplace transform of tn is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 524. |
For a voltage transfer function H(s), realizable by RLC network, the following statements are made1. H(s) cannot have a pole at s = 02. H(s) cannot have a pole at s = ± j43. H(s) cannot have a pole at s = ∞4. H(s) cannot have a pole at s = + 2 Of these statements |
| A. | 3 and 4 are correct |
| B. | 2 and 4 are correct |
| C. | 1 and 2 are correct |
| D. | 1 and 3 are correct |
| Answer» B. 2 and 4 are correct | |
| 525. |
The internal impedance of a source is 3 + j 4 Ω. It is desired to supply maximum power to a resistive load. The load resistance should be |
| A. | 3 Ω |
| B. | 4 Ω |
| C. | 7 Ω |
| D. | 5 Ω |
| Answer» E. | |
| 526. |
If operator 'a' = 1 ∠120° then (1 + a²) = |
| A. | √3 |
| B. | √3 ∠30° |
| C. | √3 ∠ - 30° |
| D. | √3 ∠60° |
| Answer» B. √3 ∠30° | |
| 527. |
Assertion (A): In high Q circuits poles of Y(s) lie close to ω axis in complex frequency plane.Reason (R): Q is inversely proportional to damping factor. |
| 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 | |
| 528. |
Consider the following statements associated with two port networks. 1. Z12 = Z212. Y12 = Y213. h12 = h214. AD - BC = 1 Which one of the statement given above are correct? |
| A. | 1, 2, 3 |
| B. | 2, 3, 4 |
| C. | 1, 3, 4 |
| D. | 1, 2, 4 |
| Answer» E. | |
| 529. |
A series circuit has R = 5 Ω and C = 10 μF. At t = 0 it is switched on to a 10 V dc battery. The maximum current in the circuit is |
| A. | 2 A |
| B. | 1 A |
| C. | 106A |
| D. | 10 μA |
| Answer» B. 1 A | |
| 530. |
One limitation of constant k filters is that Z0 is not constant in the pass band. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 531. |
If Ia, Ib, Ic are line currents and Ia1 is the positive sequences component of Ia then |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 532. |
C = (2) (energy)/V² |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 533. |
In figure, I = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 534. |
System function H(s) = 1/s+3, For a signal sin 2t, the steady state response is |
| A. | 1/8 |
| B. | ∞ |
| C. | 0 |
| D. | 8 |
| Answer» D. 8 | |
| 535. |
In figure, the charge on 0.8 μF capacitor is |
| A. | 100 μC |
| B. | 50 μC |
| C. | 40 μC |
| D. | 20 μC |
| Answer» D. 20 μC | |
| 536. |
An RLC series circuit has Q = 100 and ω₀ = 20 rad/sec. The bandwidth is |
| A. | 0.2 rad/sec |
| B. | 2 rad/sec |
| C. | 20 rad/sec |
| D. | 2000 rad/sec |
| Answer» B. 2 rad/sec | |
| 537. |
Two resistances of 2 Ω each are connected in series. A shunt having zero resistance is connected across the combination. The overall resistance will be |
| A. | 4 Ω |
| B. | 1 Ω |
| C. | 0.5 Ω |
| D. | zero |
| Answer» E. | |
| 538. |
Figure shows the variation of Z(ω) for a positive real function. The function is |
| A. | RC impedance |
| B. | RL impedance |
| C. | RLC impedance |
| D. | Reactance function |
| Answer» B. RL impedance | |
| 539. |
The temperature coefficient of copper is 0.00393 at 20° C. At 50° C the temperature coefficient is |
| A. | 0.0042 |
| B. | 0.0035 |
| C. | 0.0025 |
| D. | 0.0015 |
| Answer» C. 0.0025 | |
| 540. |
A unit impulse current δ (t - b) is applied to a capacitance C. The voltage across capacitance is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 541. |
Assertion (A): The function Z(s) = 1/s² + 1 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 | |
| 542. |
In an air cored coil, a current of 0.7 A causes a flux of 5 x 10^-6 Wb. If the core is made of cast iron and the coil is similar, the same current can set up a flux of about |
| A. | 5 x 10^-6 Wb |
| B. | 5 x 10^-8 Wb |
| C. | 10^-2 Wb |
| D. | 5 x 10^-4 Wb |
| Answer» E. | |
| 543. |
In the circuit of figure the current through 5 Ω resistance at t = ∞ is |
| A. | 0 A |
| B. | 10 A |
| C. | 6.67 A |
| D. | 5.1 A |
| Answer» B. 10 A | |
| 544. |
Assertion (A): Operator has a value 1 ∠ - 90° or 1 ∠ 90°.Reason (R): Operator 'a' has a value 1 ∠ 120°. |
| 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» E. | |
| 545. |
The voltage of the source in circuit shown __________ if i(t) = - 20e^(-2t) is |
| A. | 46.6 e^(-2t) |
| B. | 47 e^(-2t) |
| C. | 50 e^(-2t) |
| D. | 0 |
| Answer» B. 47 e^(-2t) | |
| 546. |
An input circuit has both direct and alternating current flowing through it. It is desired to transfer alternating current only by using one of the coupling units shown in figure. The coupling circuit which will do this job most effectively is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 547. |
The power dissipated in 4 Ω resistance in figure is |
| A. | 64 W |
| B. | 32 W |
| C. | 16 W |
| D. | 8 W |
| Answer» D. 8 W | |
| 548. |
The phase difference (jω - p₁ ) |
| A. | phasor directed from p₁ to jω |
| B. | phasor directed from origin to p₁ |
| C. | phasor directed from origin to jω point |
| D. | phasor directed from jω to p₁ |
| Answer» B. phasor directed from origin to p₁ | |
| 549. |
For the circuit shown in the figure, the time constant RC = 1 ms. The input voltage is V1(t) = √2 sin 10³ t. The output voltage V0(t) is equal to |
| A. | sin (10³ t - 45°) |
| B. | sin (10³ t + 45°) |
| C. | sin (10³ t - 53°) |
| D. | sin (10³ t + 53°) |
| Answer» B. sin (10³ t + 45°) | |
| 550. |
In figure, power in 6 Ω resistor is zero then V = |
| A. | 20√2∠45° |
| B. | 20 ∠30° |
| C. | 20 ∠45° |
| D. | 20√2∠30° |
| Answer» B. 20 ∠30° | |