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MCQOPTIONS
This section includes 9294 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 3301. |
Two passive elements are connected in series and a dc voltage is applied to the circuit. The time variation of the current is shown in figure. The two elements are |
| A. | one resistance and the other inductance |
| B. | both resistances |
| C. | one inductance and the other capacitance |
| D. | one resistance and the other capacitance |
| Answer» B. both resistances | |
| 3302. |
If a capacitor is charged by a square wave current source the voltage across the capacitor is |
| A. | triangular wave |
| B. | step function |
| C. | zero |
| D. | square wave |
| Answer» B. step function | |
| 3303. |
Which statement is incorrect for parallel resonance? |
| A. | P.f. is 1 |
| B. | Y is minimum |
| C. | B is zero |
| D. | Z is minimum |
| Answer» E. | |
| 3304. |
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 | |
| 3305. |
A system function the resonant frequency in rad/sec and bandwidth in rad/sec. is given by |
| A. | 10 and 1 |
| B. | 10, 4 |
| C. | 100, 5 |
| D. | 10, 10 |
| Answer» C. 100, 5 | |
| 3306. |
The equivalent resistance between terminals x and y figure is |
| A. | 150 Ω |
| B. | 45 Ω |
| C. | 55 Ω |
| D. | 35 Ω |
| Answer» E. | |
| 3307. |
To determine the polarity of voltage drop across a resistor, it is sufficient to know |
| A. | direction of current through the resistor |
| B. | direction and magnitude of current through the resistor |
| C. | direction and magnitude of current and value of resistance |
| D. | magnitude of current through the resistance |
| Answer» B. direction and magnitude of current through the resistor | |
| 3308. |
A sawtooth current wave is passed through a resistance |
| A. | the waveshapes of voltages across resistance and power will also the sawtooth |
| B. | the waveshape of voltage across resistance will be sawtooth |
| C. | the waveshape of power will be sawtooth |
| D. | neither the voltage waveshape nor power wave-shape will be sawtooth |
| Answer» C. the waveshape of power will be sawtooth | |
| 3309. |
If , the network has |
| A. | 1 H inductor and 1 F capacitor in parallel |
| B. | 1 H inductor and 1 F capacitor in series |
| C. | 1 H inductor and 1 Ω resistor in series |
| D. | 1 H inductor and 1 Ω resistor in parallel |
| Answer» B. 1 H inductor and 1 F capacitor in series | |
| 3310. |
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 | |
| 3311. |
The total inductance of two coils is 60 mH in series aiding connection and 40 mH in series opposing connection. The mutual inductance between coils is |
| A. | 20 mH |
| B. | 10 mH |
| C. | 5 mH |
| D. | 2.5 mH |
| Answer» D. 2.5 mH | |
| 3312. |
The driving point impedance of a network is The number of energy storing elements in the network is |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 3313. |
Two currents have the same peak value. Wave 1 is sinusoidal and wave 2 is rectangular. The ratio of their heating effects are |
| A. | 1 : 1 |
| B. | 1 : |
| C. | <span class="root">2</span> |
| D. | 1 : 2 |
| E. | 1 : 1.5 |
| Answer» D. 1 : 2 | |
| 3314. |
The following differential equation has |
| A. | degree = 2, order = 1 |
| B. | degree = 3, order = 2 |
| C. | degree = 4, order = 3 |
| D. | degree = 2, order = 3 |
| Answer» C. degree = 4, order = 3 | |
| 3315. |
If the transmission parameters of the given networks are A = C = 1, B = 2 and D = 3, then the value of Zm is |
| A. | 12/13 Ω |
| B. | 13/12 Ω |
| C. | 3 Ω |
| D. | 4 Ω |
| Answer» B. 13/12 Ω | |
| 3316. |
In figure, the current through 10 V battery is |
| A. | 0 |
| B. | 0.5 A charging |
| C. | 0.5 A discharging |
| D. | none of the above |
| Answer» B. 0.5 A charging | |
| 3317. |
In an ac network the sum of currents entering a node is 10 45 . The sum of currents leaving the node is |
| A. | 19.32 45 |
| B. | 15 45 |
| C. | 20 45 |
| D. | zero |
| Answer» B. 15 45 | |
| 3318. |
A T network is inserted between source and R as shown in figure. The resistance seen by the source remains the same with or without T network when R is |
| A. | 5 Ω |
| B. | 10 Ω |
| C. | 15 Ω |
| D. | 20 Ω |
| Answer» E. | |
| 3319. |
A parallel RLC network has R = 4&ohm;, L = 4H, C = 0.25F. Then at resonance Q = |
| A. | 1 |
| B. | 10 |
| C. | 20 |
| D. | 40 |
| Answer» B. 10 | |
| 3320. |
The circuit shown in the figure has initial current iL(0) = 1A through the inductor and an initial voltage vc(0) = 1 V across the capacitor. For input v(t) = U(t) the Laplace transform of the current i(t) for t 0 is |
| A. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-976-2.png"> |
| B. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-976-3.png"> |
| C. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-976-4.png"> |
| D. | <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-976-5.png"> |
| Answer» C. <img src="/_files/images/electronics-and-communication-engineering/networks-analysis-and-synthesis/142-976-4.png"> | |
| 3321. |
In figure, the short circuit current through terminal AB will be |
| A. | 3 A |
| B. | 1.5 A |
| C. | 2 A |
| D. | 1 A |
| Answer» B. 1.5 A | |
| 3322. |
As temperature increases, the temperature coefficient of a metal |
| A. | decreases |
| B. | increases |
| C. | remains unchanged |
| D. | any of the above |
| Answer» B. increases | |
| 3323. |
In the circuit shown in the figure, steady-state was reached when the switch S was open. The switch was closed at t = 0. The initial value of the current through the capacitor 2 C is |
| A. | zero |
| B. | 1 A |
| C. | 2 A |
| D. | 3 A |
| Answer» D. 3 A | |
| 3324. |
In the circuit shown in the figure, the current supplied by the sinusoidal current source I is |
| A. | 28 A |
| B. | 4 A |
| C. | 20 A |
| D. | not determinable from the data given |
| Answer» D. not determinable from the data given | |
| 3325. |
A wire has a resistance R ohm. If another wire of the same material and same weight has double the diameter (as compared to the first wire), the resistance of the second wire will be |
| A. | 0.5 R |
| B. | 0.25 R |
| C. | 0.125 R |
| D. | R/16 |
| Answer» E. | |
| 3326. |
If figure, power dissipated in 30&ohm; resistance will be maximum when value of R = |
| A. | 30 Ω |
| B. | 16 Ω |
| C. | 9 Ω |
| D. | zero |
| Answer» D. zero | |
| 3327. |
In the following non-planar graph no.of independent loop equations are |
| A. | 8 |
| B. | 12 |
| C. | 7 |
| D. | 5 |
| Answer» E. | |
| 3328. |
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 - 50.1 V | |
| 3329. |
Assertion (A): Energy stored in inductance is and that in capacitance is Reason (R): Inductance and capacitance are dual of each other. |
| 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 | |
| 3330. |
Figure shows an R-L circuit. The current is i = 1 - e-t. The rate of change of current at t = 1 second is |
| A. | 1 A/s |
| B. | 0.63 A/s |
| C. | 0.37 A/s |
| D. | 0 |
| Answer» D. 0 | |
| 3331. |
A series RLC circuit is at resonance at 200 Hz. If capacitance is increased to four times, the circuit will be in resonance at |
| A. | 200 Hz |
| B. | 400 Hz |
| C. | 100 Hz |
| D. | 800 Hz |
| Answer» D. 800 Hz | |
| 3332. |
The three sides of an admittance triangle denote |
| A. | G, B, Y |
| B. | R, X, Y |
| C. | G, B, Z |
| D. | (R, Y, Z) or (R, X, Z) |
| Answer» E. | |
| 3333. |
A step voltage E is applied to an R-L series circuit. At t = 0, the current in the circuit is |
| A. | E/R |
| B. | E/L |
| C. | infinity |
| D. | zero |
| Answer» E. | |
| 3334. |
To find current in a resistance connected in a network, Thevenin's theorem is used VTH = 20 V and RTH = 5 &ohm;. The current through the resistance |
| A. | is 4 A |
| B. | is 4 A or less |
| C. | is less than 4 A |
| D. | may be 4 A or less or more than 4 A |
| Answer» D. may be 4 A or less or more than 4 A | |
| 3335. |
A step voltage E is applied to a series R-L circuit. The rate of change of current is maximum at t = |
| A. | zero |
| B. | infinity |
| C. | L/R |
| D. | R/L |
| Answer» B. infinity | |
| 3336. |
A magnetic circuit has an iron length of 20 cm and air gap length 0.1 cm. If r = 200 then |
| A. | mmf for iron and air gap are equal |
| B. | mmf for iron is much less than that for air gap |
| C. | mmf for iron is much more than that for air gap |
| D. | either (a) or (c) |
| Answer» B. mmf for iron is much less than that for air gap | |
| 3337. |
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 38 A | |
| 3338. |
Two capacitors of 2 F and 4 F capacitance are connected in series across a 30 V dc battery. After the capacitors have been charged, the voltage across them will be |
| A. | 15 V each |
| B. | 10 V and 20 V |
| C. | 20 V and 10 V |
| D. | 30 V each |
| Answer» D. 30 V each | |
| 3339. |
Two coils X and Y have self inductances of 5 mH and 10 mH and mutual inductance of 3 mH. If the current in coils X change at a steady rate of 100 A/s, the emf induced in coil Y is |
| A. | 0.3 V |
| B. | 0.5 V |
| C. | 1 V |
| D. | 1.5 V |
| Answer» B. 0.5 V | |
| 3340. |
A 50 Hz current has an amplitude of 10 A. The rate of change of current at t = 0.005 after i = 0 and is increasing is |
| A. | 2221.44 A/s |
| B. | 0 |
| C. | - 2221.44 A/s |
| D. | - 3141.6 A/s |
| Answer» C. - 2221.44 A/s | |
| 3341. |
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 | |
| 3342. |
A parallel RLC circuit with R1 = 20, is scaled giving R2 = 104, L2 = 10-4 and C2, the value of C2 is |
| A. | 0.10 nF |
| B. | 0.3 nF |
| C. | 0.2 nF |
| D. | 0.4 nF |
| Answer» D. 0.4 nF | |
| 3343. |
Thermistor has a positive temperature coefficient. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3344. |
The Thevenin's equivalent of network in figure(1) is a 10 V source in series with 2 &ohm; resistance. If a 3 &ohm; resistance is connected across AB as shown in figure(2) the Thevenin's equivalent is |
| A. | 10 V in series with 1.2 Ω resistance |
| B. | 6 V in series with 1.2 Ω resistance |
| C. | 10 V in series with 5 Ω resistance |
| D. | 6 V in series with 5 Ω resistance |
| Answer» C. 10 V in series with 5 Ω resistance | |
| 3345. |
Assertion (A): The function 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 | |
| 3346. |
Two sinusoidal voltage sources v1 = 50 sin (100t) and v1 = 50 sin (100t + p) are connected in parallel and fed an inductance XL = 2&ohm;. The cuirent through XL is |
| A. | 25 A |
| B. | about 17.5 A |
| C. | zero |
| D. | 50 A |
| Answer» D. 50 A | |
| 3347. |
In figure, the current after a long time after closing of switch is |
| A. | 1 A |
| B. | 2 A |
| C. | 0 |
| D. | infinity |
| Answer» C. 0 | |
| 3348. |
Two voltages 50 V each have a phase difference of 45 . The rms value of resultant sum of the two voltages is |
| A. | 70.7 V |
| B. | 80.4 V |
| C. | 92.4 V |
| D. | 100 V |
| Answer» D. 100 V | |
| 3349. |
A 10 F capacitor is charged from a 5 volt source through a resistance of 10 k&ohm;. The charging current offer 35 m sec. If the initial voltage on C is - 3 V is |
| A. | 0.56 mA |
| B. | 5.6 mA |
| C. | 6 mA |
| D. | 5 A |
| Answer» B. 5.6 mA | |
| 3350. |
A triangular Pulse of 10 V peak is applied to a capacitor of 0.4 F. The change of the capacitor and its waveform is |
| A. | 8 rectangular |
| B. | 8 triangular |
| C. | 4 triangular |
| D. | 4 rectangular |
| Answer» D. 4 rectangular | |