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.
| 1301. |
Current having waveform in figure flows through 10 Ω resistance. Average power is |
| A. | 1000 W |
| B. | 500 W |
| C. | 333.3 W |
| D. | 250 W |
| Answer» D. 250 W | |
| 1302. |
When determining Thevenin's resistance of a circuit |
| A. | all sources must be open circuited |
| B. | all sources must be short circuited |
| C. | all voltages sources must be open circuited and all current sources must be short circuited |
| D. | all sources must be replaced by their internal resistances |
| Answer» C. all voltages sources must be open circuited and all current sources must be short circuited | |
| 1303. |
Consider the followingIf a network has impedance (1 - j) at a specific frequency, the circuit would consists of series R and CR and LR, L and C Which of these statements is correct? |
| A. | 1 and 2 |
| B. | 1 and 3 |
| C. | 1, 2 and 3 |
| D. | 2 and 3 |
| Answer» E. | |
| 1304. |
Norton's equivalent circuit |
| A. | is same as Thevenin's circuit |
| B. | has no relation with Thevenin's circuit |
| C. | is dual of Thevenin's circuit |
| D. | is reciprocal of Thevenin's circuit |
| Answer» D. is reciprocal of Thevenin's circuit | |
| 1305. |
The relation between the apparent power, actual power and reactive power is given by |
| A. | Apparent power = actual power + reactive power |
| B. | Apparent power = actual power - reactive power |
| C. | Apparent power = (actual power)2 - (reactive power)2 |
| D. | Apparent power = (actual power)2 + (reactive power)2 |
| Answer» E. | |
| 1306. |
For a series RLC circuit bandwidth is ω2 - ω1 = R/2L. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1307. |
In figure, S is closed at t = 0. At t = t1, I = 1 A and di/dt = 1 A/s. Then the value of L is |
| A. | 1 H |
| B. | 2 H |
| C. | 3 H |
| D. | 4 H |
| Answer» C. 3 H | |
| 1308. |
A reactance function |
| A. | has a pole at origin |
| B. | has a zero at origin |
| C. | may have a pole or zero at origin |
| D. | has a pole or zero at origin and a pole or zero at infinity |
| Answer» E. | |
| 1309. |
For a 2 port network, the O/P short circuit current was measured with a 1 volt source at the I/P then value of the current gives |
| A. | h12 |
| B. | y12 |
| C. | h21 |
| D. | y21 |
| Answer» E. | |
| 1310. |
Which one of the following theorem can be conveniently used to calculate the power consumed by the 10 Ω resistor in the network shown in the above figure? |
| A. | Thevenin's theorem |
| B. | Maximum power transfer theorem |
| C. | Millman's theorem |
| D. | Superposition theorem |
| Answer» E. | |
| 1311. |
A circuit has two branches in parallel and each branch has only one element. The applied voltage and source current are v = 200 sin (200t + 30°) and i = 50 sin (200t + 50°). If one branch has capacitor, the other branch contains |
| A. | resistance |
| B. | inductance |
| C. | capacitance |
| D. | resistance or capacitance |
| Answer» B. inductance | |
| 1312. |
Assertion (A): A parallel resonant circuit is also called anti-resonant circuit.Reason (R): In a parallel resonant circuit impedance is maximum at resonance. |
| 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 | |
| 1313. |
For a given voltage four heating coils will give maximum heat when connected |
| A. | in parallel |
| B. | in series |
| C. | with two parallel pairs in series |
| D. | with one pair in parallel and the other two in series |
| Answer» B. in series | |
| 1314. |
If B = 4 + j3, (B)1/3 = |
| A. | 2 ∠30° |
| B. | 2 ∠36.87° |
| C. | 1.71 ∠12.3° |
| D. | 1.71 ∠30° |
| Answer» C. 1.71 ‚à†12.3¬∞ | |
| 1315. |
The minimum number of equations required to analyze the circuit shown in the figure is |
| A. | 3 |
| B. | 4 |
| C. | 6 |
| D. | 7 |
| Answer» C. 6 | |
| 1316. |
The time constant of a series R-C circuit is given by |
| A. | R/C |
| B. | RC2 |
| C. | RC |
| D. | R2C |
| Answer» D. R2C | |
| 1317. |
A series RC circuit has fixed R and C and variable f. The current locus will lie in the first quadrant. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1318. |
The frame of electric motor is connected to three plates having earthing resistance of 10 Ω, 20 Ω and 30 Ω respectively. The materials of the three plates are copper, aluminium and iron respectively. The percentage of energy dissipated by 10 Ω earthing plate |
| A. | is more than 50% of total energy |
| B. | is less than 50% of total energy |
| C. | depends on the materials of the three plates |
| D. | may be more or less than 50% of total energy |
| Answer» B. is less than 50% of total energy | |
| 1319. |
A pole zero plot of a filter is shown in figure. It is |
| A. | low pass filter |
| B. | high pass filter |
| C. | band pass filter |
| D. | all pass filter |
| Answer» E. | |
| 1320. |
In a coupled coil the primary has 100 turns and secondary has 200 turns. The primary produces, a flux Φ = e-t. The coefficient of coupling is 1. The voltages induced in secondary is |
| A. | 200 e-t V |
| B. | 200 et V |
| C. | 200 V |
| D. | none of the above |
| Answer» B. 200 et V | |
| 1321. |
As temperature increases, the temperature coefficient of a metal |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | any of the above |
| Answer» B. increases | |
| 1322. |
A sinusoidal voltage is written as v = Im (R2 + XC2)0.5 sin 314 t. Its peak value and frequency are |
| A. | Im and 50 |
| B. | Im (R2 + X2C)0.5 and 50 |
| C. | 0.707 Im (R2 + X2C)0.5 and 50 |
| D. | 2 Im (R2 + X2C)0.5 and 50 |
| Answer» C. 0.707 Im (R2 + X2C)0.5 and 50 | |
| 1323. |
The electrolyte in nickel cadmium cell is dilute potassium hydroxide. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1324. |
A circuit is fed by two sources of different frequency and magnitudes 100 ∠0° V and 50 ∠30°V. The current in a particular branch is 10 ∠20° A. If the magnitudes of the sources are changed to 200 ∠0° V and 100 ∠0° V, the current in that branch should be |
| A. | 20 ∠20° A |
| B. | 10 ∠20° A |
| C. | 14.14 ∠20° A |
| D. | 10 ∠- 20° A |
| Answer» B. 10 ‚à†20¬∞ A | |
| 1325. |
A h is the unit of quantity of electricity. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1326. |
Two coil have their axis perpendicular to each other. The coefficient of coupling k is |
| A. | 1 |
| B. | 0.5 |
| C. | more than 0 but less than 1 |
| D. | 0 |
| Answer» E. | |
| 1327. |
In a purely resistive circuit the instantaneous power varies from zero to maximum twice in each cycle. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1328. |
Which statement is true for an ac circuit? |
| A. | Active power is always less than apparent power |
| B. | Active power cannot be more than apparent power |
| C. | Active power is always more than reactive power |
| D. | Active power cannot be more than reactive power |
| Answer» C. Active power is always more than reactive power | |
| 1329. |
A periodic voltage v(t) = 1 + 4 sin ωt + 2 cos ωt is applied across a 1 ohm resistance. The power dissipated is |
| A. | 1 W |
| B. | 11 W |
| C. | 21 W |
| D. | 24.5 W |
| Answer» C. 21 W | |
| 1330. |
A constant k low pass filter has fc = 1000 Hz. At f = 500 Hz, the phase shift is |
| A. | p |
| B. | zero |
| C. | more than p |
| D. | less than p |
| Answer» E. | |
| 1331. |
For the port shown, the short circuit network function at port 2 is given by |
| A. | s + 1/4 |
| B. | s + 4 |
| C. | 4s + 1 |
| D. | s + 16 |
| Answer» E. | |
| 1332. |
Ohm's law is valid for |
| A. | dc voltage and current |
| B. | ac voltage and current |
| C. | all voltages and current |
| D. | dc and ac voltages and currents |
| Answer» D. dc and ac voltages and currents | |
| 1333. |
The function is an |
| A. | LC function |
| B. | RC function |
| C. | RL function |
| D. | LC or RC function |
| Answer» B. RC function | |
| 1334. |
The current flowing through a pure capacitor is called displacement current. |
| A. | 1 |
| B. | |
| Answer» B. | |
| 1335. |
Assertion (A): KCL is dual of KVL.Reason (R): Node is dual of mesh. |
| 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 | |
| 1336. |
In the analogy between electric and magnetic circuits, flux is analogous to |
| A. | current |
| B. | voltage |
| C. | rate of charge of current |
| D. | rate of charge of voltage |
| Answer» B. voltage | |
| 1337. |
If two networks are connected in series of individual Z parameter as Za and Zb then equivalent Z is |
| A. | [Z] = [Za] + [Zb] |
| B. | [Z] = [Za] [Zb] |
| C. | [Z] = [Za]/[Zb] |
| D. | [Z] = [Za] - [Zb] |
| Answer» B. [Z] = [Za] [Zb] | |
| 1338. |
The current flowing through the resistance R in the circuit in the figure has the form 2 cos 4t, where R is |
| A. | (0.18 + j0.72) |
| B. | (0.46 + j1.90) |
| C. | #NAME? |
| D. | (0.23 - 0.35 j) |
| Answer» E. | |
| 1339. |
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 | |
| 1340. |
A band elimination constant k filter has series resonant circuit in series arms. |
| A. | 1 |
| B. | |
| Answer» C. | |
| 1341. |
In a reactance function |
| A. | all poles are simple |
| B. | all poles and zeros are simple |
| C. | all poles and zeros are simple and lie on jω axis only |
| D. | all poles and zeros lie on negative real axis |
| Answer» D. all poles and zeros lie on negative real axis | |
| 1342. |
In the transformer shown in the figure, the inductance measured across the terminal 1 and 2 was 4 H with open terminals 3 and 4. It was 3H when the terminals 3 and 4 were short circuited. The coefficient of coupling would be |
| A. | 1 |
| B. | 0.707 |
| C. | 0.5 |
| D. | indetermine due to insufficient data |
| Answer» E. | |
| 1343. |
Assertion (A): A branch with no current through it can be replaced by an open circuit or short circuit.Reason (R): Reciprocity theorem is applicable only if the circuit has one source. |
| 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 | |
| 1344. |
The resistance of a bulb at the time of full brightness is 1200 Ω. Then the resistance at room temperature is about |
| A. | 1200 Ω |
| B. | 120 Ω |
| C. | 600 Ω |
| D. | 10 Ω |
| Answer» C. 600 Œ© | |
| 1345. |
Choose the correct option ( dual). |
| A. | Tree cotree |
| B. | Twig Link |
| C. | Cutset Loop |
| D. | all |
| Answer» E. | |
| 1346. |
The series element in band pass filter is |
| A. | capacitive |
| B. | inductive |
| C. | parallel combination of inductance and capacitance |
| D. | series combination of inductance and capacitance |
| Answer» E. | |
| 1347. |
The electrochemical equivalent of a material |
| A. | depends on its valency |
| B. | depends on its atomic weight |
| C. | depends on its valency and atomic weight |
| D. | depends on the degree of hardness of the material |
| Answer» D. depends on the degree of hardness of the material | |
| 1348. |
For the network of figure, z11 = |
| A. | 5/3 Ω |
| B. | 3/2 Ω |
| C. | 2 Ω |
| D. | 2/3 Ω |
| Answer» B. 3/2 Œ© | |
| 1349. |
The material used for fuse must have |
| A. | low melting point and low specific resistance |
| B. | low melting point and high specific resistance |
| C. | high melting point and low specific resistance |
| D. | none |
| Answer» C. high melting point and low specific resistance | |
| 1350. |
The impedance 3.2 - j 12 in polar form is given as |
| A. | 6.4 ∠ - 75° |
| B. | 8.4 ∠ - 75° |
| C. | 10.4 ∠ - 75° |
| D. | 12.4 ∠ - 75° |
| Answer» E. | |