# Multiple choice question for engineering

## Set 1

1. Find the average value of current when the current that are equidistant are 4A, 5A and 6A.

a) 5A

b) 6A

c) 15A

d) 10A

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2. What is the type of current obtained by finding the square of the currents and then finding their average and then fining the square root?

a) RMS current

b) Average current

c) Instantaneous current

d) Total current

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3. For a rectangular wave, average current is ______ rms current.

a) Greater than

b) Less than

c) Equal to

d) Not related

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4. __________ current is found by dividing the area enclosed by the half cycle by the length of the base of the half cycle.

a) RMS current

b) Average current

c) Instantaneous current

d) Total current

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5. Average value of current over a half cycle is _________

a) 0.67Im

b) 0.33Im

c) 6.7Im

d) 3.3Im

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6. What is the correct expression for the rms value of current?

a) Irms=Im/2

b) Irms=Im/√2

c) Irms=Im/4

d) Irms=Im

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7. If Im is the maximum value of a sinusoidal voltage, what is the instantaneous value?

a) i=Im/2

b) i=Imsinθ

c) i=Imcosθ

d) i=Im

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8. What is the correct expression for form factor?

a) I*Iav

b) I/Iav

c) I+Iav

d) I-Iav

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9. For a direct current, the rms current is ________ the mean current.

a) Greater than

b) Less than

c) Equal to

d) Not related to

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10. For a direct voltage, the rms voltage is ________ the mean voltage.

a) Greater than

b) Less than

c) Equal to

d) Not related to

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## Set 2

1.The SI unit for bandwidth is?

a) Hz

b) Watt

c) kHz

d) kW

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2. At bandwidth frequency range, the value of the current I is?

a) I=Im/2

b) I=Im^{2}

c) I=Im

d) I=Im/√2

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3. At bandwidth frequency range, the value of the voltage V is?

a) V=Vm/2

b) V=Vm^{2}

c) V=Vm

d) V=Vm/√2

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4. At resonance, bandwidth includes the frequency range that allows _____ percent of the maximum current to flow.

a) 33.33

b) 66.67

c) 50

d) 70.7

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5. At resonance, bandwidth includes the frequency range that allows _____ percent of the maximum voltage to flow.

a) 33.33

b) 66.67

c) 50

d) 70.7

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6. Find the value of current when the maximum value of current is 50A in the bandwidth range.

a) 56.65A

b) 35.36A

c) 45.34A

d) 78.76A

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7. Find the value of voltage when the maximum value of voltage is 100V.

a) 56.65A

b) 35.36A

c) 45.34A

d) 70.72A

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8. If the resonant frequency in a series RLC circuit is 50kHz along with a bandwidth of 5kHz, find the quality factor.

a) 5

b) 50

c) 10

d) 500

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9. What happens to the bandwidth frequency range when the quality factor increases?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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10. Find the bandwidth when the resonant frequency is 50kHz and the Q factor is 10.

a) 5kHz

b) 50kHz

c) 10kHz

d) 500kHz

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## Set 3

1. In a parallel circuit, we consider _____________ instead of impedance.

a) Resistance

b) Capacitance

c) Inductance

d) Admittance

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2. In a parallel circuit, we consider instead of __________

a) Resistance

b) Capacitance

c) Inductance

d) Impedance

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3. Which, among the following is the correct expression for impedance?

a) Z=Y

b) Z=1/Y

c) Z=Y^{2}

d) Z=1/Y^{2}

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4. Which, among the following is the correct expression for admittance?

a) Y=Z

b) Y=1/Z

c) Y=Z^{2}

d) Y=1/Z^{2}

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5. What is the unit of admittance?

a) ohm

b) henry

c) farad

d) ohm^{-1}

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^{-1}because the unit of impedance is ohm and admittance is the reciprocal of impedance.

6. As the impedance increases, the admittance ____________

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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7. if the impedance of a system is 4 ohm, calculate its admittance.

a) 0.25 ohm^{-1}

b) 4 ohm^{-1}

c) 25 ohm^{-1}

d) 0.4 ohm^{-1}

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^{-1}.

8. The admittance of a system is 10 ohm^-1, calculate its impedance.

a) 10 ohm

b) 0.1 ohm

c) 1 ohm

d) 1.1 ohm

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9. If two bulbs are connected in parallel and one bulb blows out, what happens to the other bulb?

a) The other bulb blows out as well

b) The other bulb continues to glow with the same brightness

c) The other bulb glows with increased brightness

d) The other bulb stops glowing

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10. In A parallel circuit, with any number of impedances, The voltage across each impedance is?

a) The same for all impedances

b) Is divided equally among all impedances

c) Is divided proportionally across all impedances

d) Is zero for all impedances

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## Set 4

1. If two current phasors, having magnitude 5A and 10A intersect at an angle of 60 degrees, calculate the resultant current.

a) 5A

b) 10A

c) 25A

d) 20A

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2. The instantaneous values of two alternating voltages are given as _________

v1=60sinθ and v2=40sin(θ − π/3). Find the instantaneous sum.

a) 87.2 sin(23.5°) V

b) 87.2 sin( 0.5°) V

c) 87.2 sin(-23.5°) V

d) 87.2 cos(23.5°) V

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3. The instantaneous values of two alternating voltages are given as:

v1=60sinθ and v2=40sin(θ − π/3). Find the instantaneous difference.

a) 53 sin(30.9°) V

b) 53 sin(40.9°) V

c) 53 cos(30.9°) V

d) 53 cos(40.9°) V

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4. If a voltage of 2+5j and another voltage of 3+ 6j flows through two different resistors, connected in series, in a circuit, find the total voltage in the circuit.

a) 2+5j V

b) 3+6j V

c) 5+11j V

d) 5+10j V

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5. Find the total current in the circuit if two currents of 4+5j flow in the circuit.

a) 4+5j A

b) 4A

c) 5A

d) 8+10j A

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6. When one sine wave passes through the zero following the other, it is _________

a) Leading

b) Lagging

c) Neither leading nor lagging

d) Either leading or lagging

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7. The length of the phasor represents?

a) Magnitude of the quantity

b) Direction of the quantity

c) Neither magnitude nor direction

d) Either magnitude or direction

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8. For addition and subtraction of phasors, we use the _________ form.

a) Rectangular

b) Polar

c) Either rectangular or polar

d) Neither rectangular nor polar

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9. For multiplication and division of phasors, we use ____________ form.

a) Rectangular

b) Polar

c) Either rectangular or polar

d) Neither rectangular nor polar

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10. The resultant of two alternating sinusoidal voltages or currents ca be found using ___________

a) Triangular law

b) Parallelogram law

c) Either triangular or parallelogram law

d) Neither triangular nor parallelogram law

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## Set 5

1. Power factor of a circuit can be improved by placing which, among the following, in a circuit?

a) Inductor

b) Capacitor

c) Resistor

d) Switch

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2. When the supply frequency increases, what happens to the capacitive reactance in the circuit?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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3. Calculate the time constant of a series RC circuit consisting of a 100microF capacitor in series with a 100ohm resistor.

a) 0.1 sec

b) 0.1 msec

c) 0.01 sec

d) 0.01 msec

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4. Capacitors charge and discharge in __________ manner.

a) Linear

b) Constant

c) Square

d) Exponential

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5. Air has a dielectric constant of ___________

a) Unity

b) Zero

c) Infinity

d) Hundread

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6. What is the value of capacitance of a capacitor which has a voltage of 4V and ha 8C of charge.

a) 2F

b) 4F

c) 6F

d) 8F

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7. Unit of capacitance is___________

a) Volts

b) Farad

c) Henry

d) Newton

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8. What will happen to the capacitor when the source is removed?

a) It will not remain in its charged state

b) It will remain in its charged state

c) It will start discharging

d) It will become zero

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9. Which among the following equations is incorrect?

a) Q=CV

b) Q=C/V

c) V=Q/C

d) C=Q/V

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10. Capacitance is directly proportional to__________

a) Area of cross section between the plates

b) Distance of separation between the plates

c) Both area and distance

d) Neither area nor distance