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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.
| 951. |
A current of 1 A in the coil of an iron cored electromagnet causes B = 0.5T. If current is 2A, B = |
| A. | 0.5 T |
| B. | 1 T |
| C. | 1 T or more |
| D. | 1 T or less |
| Answer» E. | |
| 952. |
For making a capacitor, the dielectric should have |
| A. | high ‚ààr |
| B. | low ‚ààr |
| C. | ‚ààr = 1 |
| D. | ‚ààr neither too high nor too low |
| Answer» B. low ‚ààr | |
| 953. |
Given , and f(t)t ‚Üí ‚àû is . The value of k is |
| A. | 42430 |
| B. | 43540 |
| C. | 3 |
| D. | 43556 |
| Answer» C. 3 | |
| 954. |
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. | |
| 955. |
When analysing two port networks in parallel it is more convenient to use |
| A. | T parameters |
| B. | y parameters |
| C. | R |
| D. | C |
| Answer» E. | |
| 956. |
In a practical current source, the load current |
| A. | is always equal to source current |
| B. | is always less than source current |
| C. | is always equal to or less than source current |
| D. | cannot be higher than source current |
| Answer» C. is always equal to or less than source current | |
| 957. |
The ratio of active power to apparent power is known as __________ factor. |
| A. | power |
| B. | load |
| C. | form |
| D. | demand |
| Answer» B. load | |
| 958. |
A two branch parallel tuned circuit has a capacitance C in one of the two branches and resistance R in second branchs. As C is decreased the dynamic resistance |
| A. | increases |
| B. | decreases |
| C. | remains constant |
| D. | may increases or decreases |
| Answer» B. decreases | |
| 959. |
In a varistor, as the voltage increases beyond a certain value, its resistance |
| A. | rapidly increases |
| B. | rapidly decreases |
| C. | becomes negative, i.e., varistor goes into negative resistance region |
| D. | none of these |
| Answer» C. becomes negative, i.e., varistor goes into negative resistance region | |
| 960. |
An ac voltage 20 sin 1000t feeds an R-C series circuit. R = 8 Ω and active power is 4 W. The power factor is |
| A. | 1 |
| B. | 0.8 |
| C. | 0.6 |
| D. | 0.4 |
| Answer» E. | |
| 961. |
The double energy transients occur in the |
| A. | pure inductive coil |
| B. | R-L circuit |
| C. | R-C circuit |
| D. | R-L-C circuit |
| Answer» E. | |
| 962. |
A resistance of 5 ohms is connected in one branch of a network. The current in this branch is 2.2. A. If the resistance is increased to 7.5 Ω, the remaining circuit being the same, the current in this branch will be |
| A. | 2.2 A or less than 2.2 A |
| B. | 2.2 A or less or more than 2.2 A |
| C. | zero |
| D. | p |
| Answer» C. zero | |
| 963. |
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 |
| Answer» D. | |
| 964. |
For ideal performance, a filter should be terminated in characteristic impedance. |
| A. | 1 |
| B. | |
| C. | h11 = h22 |
| D. | h12 = h21 |
| Answer» B. | |
| 965. |
If Va1 = Va2 = 100 V and Va0 = 0, then Va, Vb, Vc are |
| A. | 200, -100 and -100 V |
| B. | 100, 100, 300 V |
| C. | 200, 100, 100 V |
| D. | 100, -100, 100 V |
| Answer» B. 100, 100, 300 V | |
| 966. |
In an infinite ladder Ckt as shown above each resistance of rΩ then RAB |
| A. | ‚àû |
| B. | |
| C. | 1.61 Ω |
| Answer» D. | |
| 967. |
When a current flows through a coil of insulated wire, the coil shows the properties of a magnet. |
| A. | 1 |
| B. | |
| C. | 1 |
| D. | |
| Answer» B. | |
| 968. |
Two currents have the same peak value. Wave 1 is sinusoidal and wave 2 is rectangular. The ratio of their heating effects are |
| A. | 0.042361111111111 |
| B. | 0.043055555555556 |
| C. | 0.043055555555556 |
| D. | 0.00071180555555556 |
| Answer» D. 0.00071180555555556 | |
| 969. |
Which is correct for a driving point function? |
| A. | If the real part of a pole or zero is zero, that pole must be simple |
| B. | If the real part of a pole or zero is zero, that pole or zero must be simple |
| C. | If the real part of a zero is zero, that pole or zero must be simple |
| D. | If the real part of a zero is zero that zero must be simple |
| Answer» C. If the real part of a zero is zero, that pole or zero must be simple | |
| 970. |
An input voltage V(t) = 10 2 cos (t + 10°) + 10 3 cos (2t + 10°)V is applied to a series combination of resistance R = 1 kΩ inductance L = 1H. The resulting steady-state current i(t) in ampere is |
| A. | 10 cos (t + 55°) + 10 cos (2t + 10° tan-12) |
| B. | 10 cos (t + 55°) + 103/2 cos (2t + 55°) |
| C. | 10 cos (t - 35) + 10 cos (2t + 10° - tan-12) |
| D. | 10 cos (t - 35) + 103/2 cos (2t + 35°) |
| Answer» D. 10 cos (t - 35) + 103/2 cos (2t + 35¬∞) | |
| 971. |
While drawing vector diagram for a series circuit, the reference vector is |
| A. | power |
| B. | phase angle |
| C. | 1 |
| D. | |
| Answer» C. 1 | |
| 972. |
The equivalent inductance measured between the terminals 1 and 2 for the circuit shown in the figure is |
| A. | L1 + L2 + M |
| B. | L1 + L2 - M |
| C. | L1 + L2 + 2M |
| D. | L1 + L2 - 2M |
| Answer» E. | |
| 973. |
If operator 'a' = 1 ∠120° then (1 - a) = |
| A. | 3 |
| B. | 3 ∠ - 30° |
| C. | 3 ∠ + 30° |
| D. | 3 ∠60° |
| Answer» C. 3 ‚à† + 30¬∞ | |
| 974. |
The voltage in a circuit follows the law v = 100 sin ωt if the frequency is 25 Hz, how long will it take for the voltage to rise to 50 volts? |
| A. | 1/150 s |
| B. | 1/100 s |
| C. | 1/300 s |
| D. | 1/600 s |
| Answer» D. 1/600 s | |
| 975. |
A tie set schedule shows |
| A. | incidence of nodes to loops |
| B. | none of the above |
| C. | 4000 Hz |
| D. | 3000 Hz |
| Answer» C. 4000 Hz | |
| 976. |
Assertion (A): Tie set schedule is used in nodal analysis.Reason (R): Loop currents are fictitious quantities. |
| A. | A is true but R is false |
| B. | A is false but R is true |
| C. | 1 |
| D. | |
| Answer» E. | |
| 977. |
Assertion (A): When excited by a unit step voltage, an inductor behaves as open circuit at t = 0.Reason (R): Inductance has the property of inertia. |
| 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 | |
| 978. |
Mesh analysis is applicable __________ only. |
| A. | planar network |
| B. | non planar network |
| C. | a circuit which contains only current sources |
| D. | none |
| Answer» B. non planar network | |
| 979. |
Impedance Z as shown in the given figure is |
| A. | j29 Ω |
| B. | j9 Ω |
| C. | j19 Ω |
| D. | j35 Ω |
| Answer» C. j19 Œ© | |
| 980. |
In a highly capacitive circuit the |
| A. | apparent power is equal to the actual power |
| B. | reactive power is more than the apparent power |
| C. | reactive power is more than the actual power |
| D. | actual power is more than its reactive power |
| Answer» D. actual power is more than its reactive power | |
| 981. |
Which of the following frequencies has the greatest period? |
| A. | 20 Hz |
| B. | 200 Hz |
| C. | 20 kHz |
| D. | 200 kHz |
| Answer» B. 200 Hz | |
| 982. |
In figure which is correct at any time t |
| A. | I = iR + iL |
| B. | I = iR + iL iC |
| C. | I = iR + iL - iC |
| D. | I = iR - iL - iC |
| Answer» C. I = iR + iL - iC | |
| 983. |
The storage battery used in power stations and substations is generally |
| A. | zinc carbon battery |
| B. | zinc carbon or lead acid battery |
| C. | J = ΔI/Δs |
| Answer» C. J = ŒîI/Œîs | |
| 984. |
Two sinusoidal voltage sources v1 = 50 sin (100t) and v1 = 50 sin (100t + p) are connected in parallel and fed an inductance XL = 2Ω. The cuirent through XL is |
| A. | 25 A |
| B. | about 17.5 A |
| C. | zero |
| D. | 50 A |
| Answer» D. 50 A | |
| 985. |
In figure, the charge on 0.8 μF capacitor is |
| A. | 100 μC |
| B. | 50 μC |
| C. | 40 μC |
| D. | 20 μC |
| Answer» D. 20 ŒºC | |
| 986. |
The Thevenin Resistance of the circuit is |
| A. | 94/7 kΩ |
| B. | 54/7 kΩ |
| C. | 7/54 kΩ |
| D. | 0 |
| Answer» C. 7/54 kŒ© | |
| 987. |
The internal impedance of a source is 3 + j 4 Ω. It is desired to supply maximum power to a resistive load. The load resistance should be |
| A. | 3 Ω |
| B. | 4 Ω |
| C. | 7 Ω |
| D. | 5 Ω |
| Answer» E. | |
| 988. |
If F(s) = , then f(t) = |
| A. | cos ω0t |
| B. | sin ω0t |
| C. | eat cos ω0t |
| D. | e-at cos ω0t |
| Answer» E. | |
| 989. |
For the two ports in figure, y11 = 8 mho, y12 = y21 = -6 mho and y22 = 6 mho. The values of YA, YB, YC respectively are |
| A. | 2, 6, 6 mho |
| B. | 2, 6, 0 mho |
| C. | 2, 0, 6 mho |
| D. | 2, 6, 8 mho |
| Answer» D. 2, 6, 8 mho | |
| 990. |
A circuit has two branches 1 and 2 in parallel. If |Q1| = 8 KVAR and |Q2| = 6 KVAR, the magnitude of total kvar drawn form supply will be |
| A. | 14 KVAR |
| B. | 2 KVAR |
| C. | zero |
| D. | 14 or 2 KVAR |
| Answer» E. | |
| 991. |
The ability of a radio receiver to discriminate between different input signals and to accept only one definite signal is called its |
| A. | selectivity |
| B. | modulation |
| C. | Both A and R are true and R is correct explanation of A |
| D. | Both A and R are true and R is not the correct explanation of A |
| Answer» D. Both A and R are true and R is not the correct explanation of A | |
| 992. |
For the network in figure, which of the following expressions gives the value of net inductance between terminals A and B L1 ± L2L1 ± L2 ± ML1 ± L2 - 2ML1 ± L2 ± 2M Select the answer using the following codes |
| A. | 1 only |
| B. | 1 and 2 |
| C. | 3 and 4 |
| D. | 2 and 4 |
| Answer» C. 3 and 4 | |
| 993. |
Ideally an attenuator pad should not change |
| A. | voltage level |
| B. | impedance level |
| C. | power level |
| D. | voltage, power or impedance level |
| Answer» C. power level | |
| 994. |
Three impedances (3 + j 4) Ω each are connected in star. The impedances of equivalent delta circuit will be |
| A. | 3 - j 4 Ω each |
| B. | 9 + j 12 Ω each |
| C. | 9 - j 12 Ω each |
| D. | 3 + j 4, 3 - j 4 and 4 - j 3 Ω |
| Answer» C. 9 - j 12 Œ© each | |
| 995. |
Assertion (A): is positive real.Reason (R): For a positive real function Re[H(jω)] ≥ 0 for 0 ≤ ω ≤ ∞. |
| 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. | |
| 996. |
For an R-C impedance function, the residues at all poles are |
| A. | real |
| B. | imaginary |
| C. | real and positive |
| D. | positive |
| Answer» D. positive | |
| 997. |
If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be |
| A. | a voltage source |
| B. | a current source |
| C. | both of the above |
| D. | none of the above |
| Answer» B. a current source | |
| 998. |
If A = 7 ∠15, A2 is |
| A. | 49 ∠225° |
| B. | 49 ∠30° |
| C. | 49 ∠15° |
| D. | 49 ∠7.5° |
| Answer» C. 49 ‚à†15¬∞ | |
| 999. |
Twelve resistance each 2 ohm are connected to form a cube, one resistance being in each arm of cube. The resistance between any two diagonally opposite comers is |
| A. | 1 Ω |
| B. | 2 Ω |
| C. | 4 Ω |
| D. | 8 Ω |
| Answer» C. 4 Œ© | |
| 1000. |
Two coils are connected in parallel. Their fluxes are adding. If the connections of one of the coils are reversed, the total inductance of the arrangement |
| A. | will decrease |
| B. | may increase or decrease |
| C. | will remain the same |
| D. | will increase |
| Answer» B. may increase or decrease | |