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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.
| 1451. |
Choose the correct option Mesh is the smallest loop of circuitLoop is smallest path of circuitLoop does not contain any meshLoop may have one or more than one mesh |
| A. | 1, 2, 3, 4 |
| B. | 3, 4, 2 |
| C. | 1, 4 |
| D. | 3, 2 |
| Answer» D. 3, 2 | |
| 1452. |
A network N is dual of network N if |
| A. | both of them have same mesh equation |
| B. | both of them have same node equation |
| C. | mesh equation of one are the node equations of the other |
| D. | KCL and KVL equations are the same |
| Answer» D. KCL and KVL equations are the same | |
| 1453. |
Assertion (A): A graph is planar if it has a dual.Reason (R): The dual of a graph can be found by window dot method. |
| 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» D. A is false but R is true | |
| 1454. |
An m derived and constant k filter section connected in cascade give |
| A. | proper impedance matching |
| B. | proper phase shift characteristic |
| C. | proper attenuation characteristic |
| D. | all of the above |
| Answer» C. proper attenuation characteristic | |
| 1455. |
Assertion (A): When capacitor is fed by a dc voltage given a capacitor behaves as short circuit at t = 0 and open circuit at f = ‚àû.Reason (R): The impedance of a capacitor is |
| 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 | |
| 1456. |
Magnetic effect of current is used in generators but not in motors. |
| A. | 1 |
| B. | |
| C. | v-i plot is not a straight line |
| D. | resistance increases as current increases |
| Answer» C. v-i plot is not a straight line | |
| 1457. |
If figure, I = 2A if R = 20 Ω. When R = 10 Ω current I is |
| A. | 0.041666666666667 |
| B. | 0.083333333333333 |
| C. | 2.5 A |
| D. | 0.125 |
| Answer» C. 2.5 A | |
| 1458. |
A two branch parallel tuned circuit has 100 Ω resistance and 0.1 H inductance in one branch and 10-6 F capacitor in the other. At resonance frequency, the dynamic resistance is |
| A. | 10 Ω |
| B. | 100 Ω |
| C. | 1000 Ω |
| D. | 10000 Ω |
| Answer» D. 10000 Œ© | |
| 1459. |
Giga watt is equal to |
| A. | 1012 W |
| B. | 109 W |
| C. | 106 W |
| D. | 103 W |
| Answer» C. 106 W | |
| 1460. |
Which one is correct option, if initial conditions is not zero, for inductor (L) and capacitor (c) is |
| A. | 1, 3 |
| B. | 3, 2 |
| C. | 4, 1 |
| D. | 2, 4 |
| Answer» E. | |
| 1461. |
A wave trap is a |
| A. | series tuned circuit |
| B. | a parallel tuned circuit |
| C. | either a series tuned circuit or parallel tuned circuit |
| D. | none of the above |
| Answer» C. either a series tuned circuit or parallel tuned circuit | |
| 1462. |
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¬∞ | |
| 1463. |
The self inductances of two coils are 27 H and 3 H. If the winding or coils is such that 50% of flux of one links the other, the mutual inductance is |
| A. | 30 H |
| B. | 24 H |
| C. | 9 H |
| D. | 4.5 H |
| Answer» E. | |
| 1464. |
A series R-L circuit has R = 1 Ω and L = 1 H. It is excited by a V battery at t = 0. The steady state condition is reached at |
| A. | t = 1 s |
| B. | t = 0.1 s |
| C. | t = 0 s |
| D. | t = ‚àû |
| Answer» E. | |
| 1465. |
A series resonant circuit is capacitive at f = 150 Hz. The circuit will be inductive somewhere at |
| A. | f greater than 150 Hz |
| B. | f less than 150 Hz |
| C. | f equal to 150 Hz by increasing the value of the resistance |
| D. | none of the above |
| Answer» B. f less than 150 Hz | |
| 1466. |
The current rating of a cable depends on |
| A. | length of cable |
| B. | diameter of cable |
| C. | both length and diameter of cable |
| D. | none of the above |
| Answer» C. both length and diameter of cable | |
| 1467. |
The shot circuit admittance matrix of a two port network is |
| A. | non-reciprocal and passive |
| B. | non-reciprocal and active |
| C. | reciprocal and passive |
| D. | reciprocal and active |
| Answer» C. reciprocal and passive | |
| 1468. |
For the wave shown in figure, the average value is |
| A. | 14.14 A |
| B. | 15 A |
| C. | 17.17 A |
| D. | 19.19 A |
| Answer» C. 17.17 A | |
| 1469. |
The resistance of the aluminium conductor (r = 2.83 x 10-8 Ωm) in figure is |
| A. | 0.001 Ω |
| B. | less than 0.001 Ω |
| C. | more than 0.001 Ω |
| D. | more than 0.002 Ω |
| Answer» C. more than 0.001 Œ© | |
| 1470. |
and i(t) is a unit step, then V(t) in the steady state is given by |
| A. | 43712 |
| B. | 43528 |
| C. | 0 |
| D. | ‚àû |
| Answer» B. 43528 | |
| 1471. |
The zinc can of a dry cell serves as positive terminal. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1472. |
A circuit is fed by two sources of the same frequency and values 100 ∠0° V and 20 ∠30°V. The current in a particular branch is 5 ∠19° A. If the magnitudes of the sources and changed to 200 ∠0° V and 40 ∠30° V, the current in that branch should be |
| A. | 5 ∠19° A |
| B. | 10 ∠19° A |
| C. | 10 ∠38° A |
| D. | 10 ∠9.5° A |
| Answer» C. 10 ‚à†38¬∞ A | |
| 1473. |
A function f(t) = k is |
| A. | stable |
| B. | marginal stable |
| C. | unstable |
| D. | none |
| Answer» C. unstable | |
| 1474. |
Hysteresis loss is proportional to |
| A. | f and B1.6m |
| B. | f and Bm |
| C. | f2 and Bm |
| D. | f2 and B2m |
| Answer» B. f and Bm | |
| 1475. |
Two networks are cascaded through an ideal buffer. If td1 and td2 are delay times of network, the overall delay time is |
| A. | td1 + td2 |
| B. | t2d1 + t2d2 |
| C. | td1 + td2 |
| Answer» D. | |
| 1476. |
When a current flows through a conductor, |
| A. | an electric field exists at all points within the conductor |
| B. | electric field exists only at all points on the surface of the conductor |
| C. | electric field exists only at ends of the conductor |
| D. | any of the above depending on magnitude of current |
| Answer» B. electric field exists only at all points on the surface of the conductor | |
| 1477. |
In a R-L-C circuit at resonance is |
| A. | maximum in series resonance and minimum in parallel resonance. |
| B. | maximum in parallel resonance and minimum in series resonance |
| C. | minimum in both series and parallel resonances |
| D. | maximum in both series and parallel resonances. |
| Answer» B. maximum in parallel resonance and minimum in series resonance | |
| 1478. |
The poles of an RC function |
| A. | are simple and lie or negative real axis |
| B. | are simple and lie on ω axis |
| C. | must be complex conjugate |
| D. | may be anywhere on s plane |
| Answer» B. are simple and lie on œâ axis | |
| 1479. |
In the circuit of figure is |
| A. | I1 will always lag I3 |
| B. | I2 may be in phase or lag I3 |
| C. | I3 will always lag I2 |
| D. | I2 and I3 will be in phase |
| Answer» D. I2 and I3 will be in phase | |
| 1480. |
RMS value of i(t) = 10[1 + sin (- t)] is |
| A. | 10 |
| B. | 43506 |
| C. | l50 |
| D. | 102 |
| Answer» D. 102 | |
| 1481. |
Two port network is said to be symmetrical if |
| A. | Δh = 1 |
| B. | Z11 = Z2 |
| C. | A = Δ |
| D. | all |
| Answer» E. | |
| 1482. |
Power is drawn from a source at power factor 0.7. Pav = 300 watt. The reactive power is |
| A. | 0 |
| B. | 105 |
| C. | 100 VA |
| D. | 107 VA |
| Answer» E. | |
| 1483. |
Assertion (A): When a square periodic wave is applied to an RC circuit, the voltage across capacitor is observed to be a triangular periodic wave.Reason (R): The RC circuit works as integrator and its time constant is much larger than time period of input wave. |
| 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 | |
| 1484. |
For representing two sinusoidal voltages on a phasor diagram |
| A. | Both voltages must be of the same frequency |
| B. | Both voltages must be sinusoidal but may be of different frequencies |
| C. | One of the voltages must be of 50 Hz |
| D. | The frequency of one must be integral of that of other |
| Answer» B. Both voltages must be sinusoidal but may be of different frequencies | |
| 1485. |
The transient currents are due to |
| A. | resistance of the circuit |
| B. | impedance of the circuit |
| C. | voltage applied to the circuit |
| D. | changes in stored energy in inductors and capacitors |
| Answer» E. | |
| 1486. |
A low pass single pole filter has a the corner frequency and its phase shift are |
| A. | 1K rad/sec |
| B. | 40 kHz |
| C. | 4 kHz |
| D. | 40 x 103 rad/sec |
| Answer» E. | |
| 1487. |
A low-pass filter frequency responce H (jω) = A (ω) ejΦ(ω) does not produce any phase distortion, if |
| A. | A(ω) = Cω2, Φ (ω) = kω3 |
| B. | A(ω) = Cω2, Φ (ω) = kω |
| C. | A(ω) = Cω2, Φ (ω) = kω2 |
| D. | A(ω) = C, Φ (ω) = kω-1 |
| Answer» C. A(œâ) = Cœâ2, Œ¶ (œâ) = kœâ2 | |
| 1488. |
A 3 phase balanced supply feeds 3 phase unbalanced load. Power supplied to the load can be measured by using 2 wattmeterone wattmeter3 wattmeter Which of the above statements is correct? |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 2 and 3 |
| D. | 3 alone |
| Answer» C. 2 and 3 | |
| 1489. |
The energy stored in a coil is 108 J. It is opened suddenly in 10 ms. The power dissipated instantaneously across the blades of switch is |
| A. | 108 W |
| B. | 1080 W |
| C. | 10800 W |
| D. | 108000 W |
| Answer» D. 108000 W | |
| 1490. |
An R-L circuit has an initial current of 5 A. In the s-domain equivalent circuit, the voltage source to take into account the initial current has a strength of |
| A. | 5L volts |
| B. | 5/L volts |
| C. | 5L2 volts |
| D. | 5/L2 volts |
| Answer» B. 5/L volts | |
| 1491. |
In a purely inductive ac circuit the power curve is a sinusoid of the same frequency as the voltage. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1492. |
Assertion (A): If A = 0.5 ∠ 20°, A2 = 0.25 ∠ 40°.Reason (R): When drawing a phasor diagram, sinusoids may have the same or different frequencies. |
| 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» D. A is false but R is true | |
| 1493. |
The resistance of a standard conductor. |
| A. | increases with frequency |
| B. | same for ac and dc |
| C. | increases with frequency |
| D. | increases as square root of frequency |
| Answer» E. | |
| 1494. |
A two branch tuned circuit has a coil of resistance R and inductance L in one branch and capacitance C in the second branch. If R is increased, the dynamic resistance |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may increases or decreases |
| Answer» C. remains constant | |
| 1495. |
Assertion (A): The s domain impedance of a series R-L circuit is R + sL irrespective of initial conditions.Reason (R): Complex frequency s = σ + jω. |
| 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. | |
| 1496. |
As compared to the number of network elements in Brune synthesis, the number of network elements Bott-and Duffin in realization is |
| A. | more |
| B. | less |
| C. | equal |
| D. | any of the above |
| Answer» B. less | |
| 1497. |
Dielectric constant of air is about 5. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1498. |
An RLC series circuit has R = 7.07 Ω, L = .707 H and C = 7.07 μF. At Half power frequencies the circuit impedance is likely to be |
| A. | 7.07 Ω |
| B. | 10 Ω |
| C. | 14.14 Ω |
| D. | 20 Ω |
| Answer» C. 14.14 Œ© | |
| 1499. |
Pick the correct statement with respect to following figure. |
| A. | both the circuit are not identical filter Ckts |
| B. | identical filter circuit at all frequencies |
| C. | identical filter circuit at low frequency |
| D. | identical filter circuit at high frequency |
| Answer» D. identical filter circuit at high frequency | |
| 1500. |
A cut set schedule shows |
| A. | incidence of branches to loops |
| B. | incidence of branches to nodes |
| C. | incidence of nodes to loops |
| D. | none of the above |
| Answer» C. incidence of nodes to loops | |