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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.
| 301. |
The expression for the resonant frequency ω0 in the circuit shown |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 302. |
An ac network has two sources of the same frequency. The currents in one branch when the sources act independently are 10 ∠30° A and 10 ∠60° A. When both sources act, the current in the branch should be |
| A. | 19.32 ∠45° |
| B. | 15 ∠45° |
| C. | 20 ∠45° |
| D. | zero |
| Answer» B. 15 ∠45° | |
| 303. |
Class C solid insulators should not be used above 100°C. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 304. |
In an R-L-C series circuit, R = 2/√L/C . If R is doubled |
| A. | the response will become underdamped |
| B. | the response will become overdamped |
| C. | the response will be critically damped |
| D. | the response may be under damped or overdamped |
| Answer» C. the response will be critically damped | |
| 305. |
In a series RLC circuit, the resonant frequency is ω0 the fractional frequency deviation is defined as |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 306. |
Calculate i(t) for t ≥ 0, assuming the switch has been in position A for a long time at t = 0, the switch is moved to position B |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 307. |
If resistance is 20 Ω and inductance is 2 H in a R-L series circuit, then time constant of this will be |
| A. | 0.001 s |
| B. | 0.1 s |
| C. | 10 s |
| D. | 100 s |
| Answer» C. 10 s | |
| 308. |
√L/C has the dimension of |
| A. | time |
| B. | capacitance |
| C. | inductance |
| D. | resistance |
| Answer» E. | |
| 309. |
In a series resonant circuit Q is more than 10. Then the lower half power frequency ω₁, and resonant frequency ω₀ are related as |
| A. | ω₁ = ω₀ + bandwidth |
| B. | ω₁ = ω₀ + 0.5 (bandwidth) |
| C. | ω₁ = ω₀ - 0.5 (bandwidth) |
| D. | ω₁ = ω₀ + bandwidth |
| Answer» D. ω₁ = ω₀ + bandwidth | |
| 310. |
For a high pass filter, β = π in attenuation band. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» C. May be True or False | |
| 311. |
Two capacitors of 16 μF each are connected in series. Another capacitor of 16 μF is connected in parallel with this combination. The total capacitance will be |
| A. | 48 μF |
| B. | 32 μF |
| C. | 24 μF |
| D. | 32μF/3 |
| Answer» D. 32μF/3 | |
| 312. |
The following function is |
| A. | RC function |
| B. | LC function |
| C. | RL function |
| D. | RC or RL function |
| Answer» C. RL function | |
| 313. |
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 Ω | |
| 314. |
If figure, I = 2A if R = 20 Ω. When R = 10 Ω current I is |
| A. | 1 A |
| B. | 2 A |
| C. | 2.5 A |
| D. | 3 A |
| Answer» C. 2.5 A | |
| 315. |
The function s² + 1/ s(s² + 2) is an |
| A. | LC function |
| B. | RC function |
| C. | RL function |
| D. | LC or RC function |
| Answer» B. RC function | |
| 316. |
Figure shows the V-i characteristics of a material. The material is likely to be |
| A. | copper |
| B. | carbon |
| C. | zinc oxide |
| D. | rubber |
| Answer» D. rubber | |
| 317. |
A network is said to be two port network if there is1. no independent source in the network2. no dependent source in the network3. non-linear component in the circuit4. no external connection exist between I/P and 0/P |
| A. | 1, 2, 3 |
| B. | 3, 4, 2 |
| C. | 1, 3, 4 |
| D. | 4, 3, 1, 2 |
| Answer» D. 4, 3, 1, 2 | |
| 318. |
A series RLC circuit has a resonance frequency of 1 kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value, the new Q of the circuit is |
| A. | 25 |
| B. | 50 |
| C. | 100 |
| D. | 200 |
| Answer» C. 100 | |
| 319. |
The driving point impedance Z1 is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 320. |
The energy dissipated W in a resistance having voltages v and current i is given by |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 321. |
If A = 4∠7°, A² is |
| A. | 16∠14° |
| B. | 16∠49° |
| C. | 16∠7° |
| D. | 16∠3.5 |
| Answer» B. 16∠49° | |
| 322. |
A low-pass filter frequency responce H (jω) = A (ω) e^(jΦ) (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(ω) = Cω², Φ (ω) = kω² | |
| 323. |
In figure, the current through 2 Ω resistance is |
| A. | zero |
| B. | -2A |
| C. | 2A |
| D. | 1A |
| Answer» B. -2A | |
| 324. |
The circuit in figure, the switched on at t = 0. After a long time the current through 5 Ω resistance is |
| A. | 1 A |
| B. | 4 A |
| C. | 10 A |
| D. | 0 |
| Answer» E. | |
| 325. |
A voltage v = 100 sin (100 pt + 45°) V is applied to an impedance 10 + j10 ohm. The current is |
| A. | 10 ∠45° A |
| B. | 7.07 ∠45° A |
| C. | 5 ∠45° A |
| D. | 5 ∠0 A |
| Answer» E. | |
| 326. |
A system has transfer function 10/(s+1)(s+2). The dc gain is |
| A. | 1 |
| B. | 2 |
| C. | 5 |
| D. | 10 |
| Answer» D. 10 | |
| 327. |
The current in an RL series circuit is 1 - e^(-t) amperes. Then di/dt is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 328. |
A sinusoidal voltage is written as v = Im (R² + XC²)^0.5 sin 314 t. Its peak value and frequency are |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 329. |
Terra-watt is equal to |
| A. | 10³ W |
| B. | 10⁶ W |
| C. | 10⁹ W |
| D. | 10¹² W |
| Answer» E. | |
| 330. |
The current voltage relation for an inductance L is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 331. |
A unit impulse voltage δ (t - b) is applied to an inductor with inductance L. The current through L is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 332. |
Poles and zeros of a driving point function of a network are simple and alternate on jω axis. The network consists of |
| A. | R and C |
| B. | L and C |
| C. | R and L |
| D. | R, L and C |
| Answer» C. R and L | |
| 333. |
In figure, i = Im sin ωt. If v = 0, ω = |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» B. B | |
| 334. |
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 | |
| 335. |
At a temperature of 7 K, lead is a superconductor. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 336. |
Consider the following units 1. sec¯¹2. rad²/sec²3. sec4. Ω The units of R/L, 1/LC, RC and √L/C are respectively |
| A. | 1, 2, 4, 3 |
| B. | 3, 2, 1, 4 |
| C. | 2, 4, 1, 3 |
| D. | 1, 2, 3, 4 |
| Answer» E. | |
| 337. |
In figure, i(0-) and v(0-) are zero. The switch is closed at t = 0, i(0+) and (∞) are |
| A. | 3 A and 1.5 A |
| B. | 1.5 A and zero |
| C. | 3 A and zero |
| D. | 1.5 A and 3 A |
| Answer» D. 1.5 A and 3 A | |
| 338. |
μ₀ = 8.85 x 10¯¹²F/m. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | can't say |
| Answer» B. False | |
| 339. |
The transfer function s/(s+a) is for |
| A. | low pass filter |
| B. | notch filter |
| C. | high pass filter |
| D. | band pass filter |
| Answer» B. notch filter | |
| 340. |
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 Ω | |
| 341. |
In the below 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 ∠ 30° | |
| 342. |
For an RC admittance function Y, the slope dY/dσ |
| A. | is positive |
| B. | is negative |
| C. | may be positive or negative |
| D. | 0 |
| Answer» B. is negative | |
| 343. |
The RLC circuit for driving point following admittance function is |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» D. D | |
| 344. |
Two capacitor of 1 F each are connected in parallel. Another 1 F capacitor is connected in series with the parallel combination. The total capacitance is |
| A. | 3 F |
| B. | 2 F |
| C. | 2F/3 |
| D. | F/3 |
| Answer» D. F/3 | |
| 345. |
The circuit in figure has reached steady values with switch open. If switch is closed at t = 0 the voltage across 2 μF capacitance at t = 0+ is |
| A. | zero |
| B. | 4 V |
| C. | 6 V |
| D. | 10 V |
| Answer» B. 4 V | |
| 346. |
The function δ (t - b) is a |
| A. | unit impulse |
| B. | unit step |
| C. | unit doublet |
| D. | none of the above |
| Answer» D. none of the above | |
| 347. |
A coil of resistance R and inductance L is connected in series with 10 mF capacitor. The resonant frequency is 1000 Hz. Another 10 F capacitor is connected in parallel with the above capacitor. The new resonance frequency will be |
| A. | 1000 Hz |
| B. | more than 1000 Hz |
| C. | less than 1000 Hz |
| D. | may be more or less than 10000 Hz |
| Answer» D. may be more or less than 10000 Hz | |
| 348. |
The realization of a term K₀/s in the impedance function will give |
| A. | an inductance of value K₀ in series |
| B. | an inductance of value 1/K₀ in series |
| C. | even to odd or odd to even polynomials |
| D. | even to even polynomials |
| Answer» E. | |
| 349. |
In an RLC underdamped circuit |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» C. C | |
| 350. |
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° | |