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.
| 801. |
The realization of the term Ks yields |
| A. | a resistance of value K ohms |
| B. | a capacitances of value K farads |
| C. | an inductance of value k farads |
| D. | either (b) or (c) |
| Answer» D. either (b) or (c) | |
| 802. |
The model of a system |
| A. | is unique |
| B. | depends on desired degree of accuracy |
| C. | depends on the type of analysis |
| D. | both (b) and (c) |
| Answer» C. depends on the type of analysis | |
| 803. |
A heater is rated at 230 V, 5 A AC. Then |
| A. | both the current and voltage are peak values |
| B. | both the current and voltage are rms values |
| C. | the current is peak value and voltage is rms value |
| D. | the current is rms value and voltage is peak value |
| Answer» E. | |
| 804. |
The circuit in figure is switched on at t = 0. At any time t, i(t) = |
| A. | 3 + 3e-1 |
| B. | 6 - 3e-1 |
| C. | 3 - 3e-t |
| D. | 6 - 6e-1 |
| Answer» C. 3 - 3e-t | |
| 805. |
A coil is connected across a 200 V, 50 Hz supply and takes a current of 10 A. The loss in the coil is 1000 W. The impedance and resistance of the coil are |
| A. | 20 Ω, 10 Ω |
| B. | 30 Ω, 15 Ω |
| C. | 1 |
| D. | |
| Answer» D. | |
| 806. |
Two sinusoidal waves 1 and 2 have peak values Vm1 and Vm2. Wave 1 is leading wave 2 by ∠θ. Which of the following is correct? |
| A. | v1 = Vm1 sin (ωt + θ/2) and v2 = Vm2 sin ωt |
| B. | none of the above |
| C. | dc voltage and current |
| D. | ac voltage and current |
| Answer» C. dc voltage and current | |
| 807. |
If the iron core of a coil is removed so that it becomes an air cored coil, its inductance |
| A. | will increase |
| B. | will decrease |
| C. | will remain the same |
| D. | may increase or decrease |
| Answer» C. will remain the same | |
| 808. |
If all other parameters are the same, a capacitor with mica as dielectric has higher capacitance than air capacitor. |
| A. | 1 |
| B. | |
| C. | 10 ∠ 32° |
| D. | 10 ∠ 8° |
| Answer» B. | |
| 809. |
Assertion (A): Most of magnetic circuits have an air gap.Reason (R): An air gap has high reluctance. |
| A. | A is true but R is false |
| B. | A is false but R is true |
| C. | 0.4 p |
| D. | 0.66666666666667 |
| Answer» C. 0.4 p | |
| 810. |
As per Euler's identity ejωt = cos ωt + j sin ωt |
| A. | 1 |
| B. | |
| C. | 60 |
| D. | 10 |
| Answer» B. | |
| 811. |
The damping coefficient for the given circuit is __________ |
| A. | 2 |
| B. | 1 |
| C. | 2700 units |
| D. | 0.45 units |
| Answer» B. 1 | |
| 812. |
A 10 μF capacitor is charged from a 5 volt source through a resistance of 10 kΩ. 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 μA |
| Answer» B. 5.6 mA | |
| 813. |
In the given circuit, V1 = 40 V when R is 10 Ω. When R is zero, the value of V2 will be |
| A. | 40 V |
| B. | 30 V |
| C. | 20 V |
| D. | 10 V |
| Answer» B. 30 V | |
| 814. |
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 | |
| 815. |
The Z parameters Z11 and Z21 for the 2-port network in the figure. |
| A. | Z11 = 6/11Ω; Z21 = - 16/11Ω |
| B. | Z11 = 4/11Ω; Z21 = 4/11Ω |
| C. | 7.07 A |
| D. | 0.20833333333333 |
| Answer» D. 0.20833333333333 | |
| 816. |
A 3 phase star-connected load has one capacitor C in R phase and two equal resistances in Y and B phases.The phase sequence is RBY. Then |
| A. | VB0 > VY0 |
| B. | VB0 < VY0 |
| C. | VB0 = VY0 |
| D. | VB0 = VBY |
| Answer» B. VB0 < VY0 | |
| 817. |
Two port Z parameter not exist for the circuit if |
| A. | Δz = 0 |
| B. | Δz |
| C. | Δz = 1 |
| D. | always exist |
| Answer» B. Œîz | |
| 818. |
In an ac series RLC circuit the maximum phase difference between any two voltages can be |
| A. | 90° |
| B. | 45° |
| C. | - 90° |
| D. | 180° |
| Answer» E. | |
| 819. |
The rms voltage measured across each of the circuit element in figure is as shown, when the circuit is excited by a sinusoidal voltage Es, the rms value of the source voltage es is |
| A. | Es |
| B. | 5 volt |
| C. | a necessary condition |
| D. | a sufficient condition |
| Answer» E. | |
| 820. |
If the voltage across the last resistor is V, and all the resistor is unity. Then Vs is given by |
| A. | 8 V |
| B. | 4 V |
| C. | 13 V |
| D. | 0 |
| Answer» B. 4 V | |
| 821. |
h parameters are used in transistor analysis. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 822. |
A network contains only independent current source and resistors. If the values of all resistors are doubled, the value of the node voltage |
| A. | will become half |
| B. | will remain unchange |
| C. | will become one third |
| D. | cannot be determined unless the circuit configuration and the values of the resistors are known |
| Answer» D. cannot be determined unless the circuit configuration and the values of the resistors are known | |
| 823. |
The current wave shown in figure is applied at t = 0 to a 0.1 F capacitor. At t = 1 s, the voltage across capacitor is |
| A. | 0 V |
| B. | 10 V |
| C. | 20 V |
| D. | 40 V |
| Answer» D. 40 V | |
| 824. |
The colour code of a carbon resistance is yellow-violet-orange silver. The value of resistance is |
| A. | 57000 Ω ± 5% |
| B. | 47000 Ω ± 10% |
| C. | 47000 Ω ± 5% |
| D. | 57000 Ω ± 5% |
| Answer» C. 47000 Œ© ¬± 5% | |
| 825. |
An RLC series circuit has R = 8 Ω, XL = 8 Ω and XC = 8 Ω Its impedance is |
| A. | 8 + j 16 Ω |
| B. | 8 + j 8 Ω |
| C. | 8 Ω |
| D. | 24 Ω |
| Answer» D. 24 Œ© | |
| 826. |
The dynamic impedance of an R-L and C parallel circuit at resonance is __________ ohm. |
| A. | R/LC |
| B. | C/LR |
| C. | LC/R |
| D. | L/CR |
| Answer» E. | |
| 827. |
The sum of two sine waves of different frequencies is a sine wave. |
| A. | Pole A is N-pole, B is S-pole and C is neutral |
| B. | A is N, B and C is S |
| C. | A is N, C is S |
| D. | A is S, C is neutral, B is N |
| Answer» C. A is N, C is S | |
| 828. |
The units for electrochemical equivalent are |
| A. | grams |
| B. | grams per coulomb |
| C. | gram-coulomb |
| D. | grams per ampere |
| Answer» E. | |
| 829. |
A wire has a diameter d and resistance R. If the diameter is made 3d, the length and material remaining the same, the new value of resistance will be |
| A. | R/3 |
| B. | 3 R |
| C. | R/9 |
| D. | 9 R |
| Answer» D. 9 R | |
| 830. |
In the circuit of figure. The current supplied by battery at t = ‚àû is |
| A. | 0 |
| B. | 0.20833333333333 |
| C. | less than 5 A |
| D. | very large |
| Answer» C. less than 5 A | |
| 831. |
In a pure capacitive circuit if the supply frequency is reduced to 1/2, the current will |
| A. | be reduced by half |
| B. | be doubled |
| C. | be four times as high |
| D. | be reduced to one fourth |
| Answer» B. be doubled | |
| 832. |
In the network of the figure is the maximum power is delivered to RL if its value is |
| A. | 16 Ω |
| B. | 40/3 Ω |
| C. | 60 Ω |
| D. | 20 Ω |
| Answer» C. 60 Œ© | |
| 833. |
The Gaussian filter characteristic figure is realizable. |
| A. | 1 |
| B. | |
| C. | 1000 Hz |
| D. | more than 1000 Hz |
| Answer» C. 1000 Hz | |
| 834. |
What would be the rms value of a sine wave having the same peak value as that of the above mentioned periodic wave? |
| A. | 42.2 V |
| B. | 19 V |
| C. | 38.2 V |
| D. | none |
| Answer» B. 19 V | |
| 835. |
Tellegen's theorem is applicable to |
| A. | circuits with passive elements only |
| B. | circuits with linear elements only |
| C. | circuits with time invariant elements only |
| D. | circuits with active or passive, linear or nonlinear and time invariant or time varying elements |
| Answer» E. | |
| 836. |
Maximum power transfer theorem is applicable to circuits with one source only. |
| A. | 1 |
| B. | |
| C. | k L1L2 |
| D. | k2L1L2 |
| Answer» B. | |
| 837. |
Nodal analysis is applicable to __________ . |
| A. | circuit containing only voltage source |
| B. | non planer |
| C. | a high pass filter |
| D. | band elimination filter |
| Answer» C. a high pass filter | |
| 838. |
In the transformer shown in figure, the inductance measured across terminal 1 and 2 was 4 H with terminals 3 and 4 open. It was 3H when terminals 3 and 4 are short circuited. The coefficient of coupling is |
| A. | 1 |
| B. | 0.707 |
| C. | 0.5 |
| D. | indeterminate due to insufficient data |
| Answer» D. indeterminate due to insufficient data | |
| 839. |
If Z(s) has a pole at origin, the realization leads to |
| A. | a resistance in series |
| B. | an inductance in series |
| C. | a capacitance in series |
| D. | a resistance or capacitance in series |
| Answer» D. a resistance or capacitance in series | |
| 840. |
If two networks are cascaded then |
| A. | [y] = [ya] . [yb] |
| B. | [Z] = [Za] . [Zb] |
| C. | [aa] = [bb] |
| D. | [aa] + [bb] |
| Answer» D. [aa] + [bb] | |
| 841. |
Stray capacitance is important at low frequencies. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 842. |
μ0 = 8.85 x 10-12F/m. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 843. |
A network contains linear resistors and ideal voltage sources. If values of all the resistors are doubled, then the voltage across each resistor is |
| A. | half |
| B. | doubled |
| C. | increase by 4 times |
| D. | no change |
| Answer» E. | |
| 844. |
In figure the rms value is |
| A. | 5 |
| B. | 2.5 |
| C. | 2.5 |
| D. | 50 |
| Answer» E. | |
| 845. |
Current in a 2H inductance in 10e-t A. Admittance of the inductor is |
| A. | -0.5 mho |
| B. | 0.5 mho |
| C. | 5 mho |
| D. | 10 mho |
| Answer» B. 0.5 mho | |
| 846. |
A current 10 sin (200t) A flows through a 5 mH inductance. The expression for voltage is |
| A. | 10 sin (200t + 90°) |
| B. | 10 sin (200t - 90°) |
| C. | 10 sin(1000t + 90°) |
| D. | 10 sin (1000t - 90°) |
| Answer» E. | |
| 847. |
In figure, the voltmeter is ideal. The transformer has two identical windings with perfect coupling. The reading of voltmeter is |
| A. | 440 V |
| B. | 220 V |
| C. | 110 V |
| D. | zero |
| Answer» E. | |
| 848. |
The bridge is balanced when the value of R is |
| A. | 200 Ω |
| B. | 250 Ω |
| C. | 0.041666666666667 |
| D. | 0.5 A |
| Answer» D. 0.5 A | |
| 849. |
For the two port of figure, z11 is |
| A. | 26/7 Ω |
| B. | 10/3 Ω |
| C. | 6 Ω |
| D. | 2 Ω |
| Answer» B. 10/3 Œ© | |
| 850. |
In the graph of figure, the total number of trees is |
| A. | 4 |
| B. | 5 |
| C. | 6 |
| D. | 8 |
| Answer» E. | |