# Multiple choice question for engineering

## Set 1

1. What is the expression for force in a current carrying conductor?

a) F=Kq1/r^{2}

b) F=Kq2/r^{2}

c) F=Kq1q2/r^{2}

d) F=Kq1q2/r

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^{2}, where K is the constant of proportionality.

2. Force in a conductor is__________ to the product of the charges.

a) Directly proportional

b) Inversely proportional

c) Not related

d) Cannot be determined

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3. Force in a conductor is __________ to the square of the distance between the charges.

a) Directly proportional

b) Inversely proportional

c) Not related

d) Cannot be determined

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4. Calculate the force between two charges having magnitude 3nC and 2nC separated by a distance of 2micro m.

a) 13.5N

b) 13.5kN

c) 1.35N

d) 1.35kN

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^{2}, the value of K being 9*10

^{9}, we get F=13.5kN.

5. If the flow of electric current is parallel to the magnetic field, the force will be?

a) Zero

b) Infinity

c) Maximum

d) Half the original value

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6. The ratio of magnetic force to electric force on a charged particle getting undeflected in a field is ______

a) 1

b) 0

c) 2

d) 4

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7. Weakest force in nature is __________

a) Electric force

b) Gravitational force

c) Weak force

d) Magnetic force

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8. According to Flemming’s left hand rule, the thumb denotes?

a) Direction of magnetic field

b) Direction of current

c) Direction of force

d) Direction of force as well as current

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9. The relation between the direction of force and the direction of magnetic field is __________

a) Same direction

b) Opposite direction

c) Perpendicular

d) Unrelated

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10. The relation between the direction of current and the direction of force is ________

a) Same direction

b) Opposite direction

c) Perpendicular

d) Unrelated

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## Set 2

1. Which, among the following, is the correct expression for force in a current carrying conductor?

a) F=Bi

b) F=B^{2}il

c) F=Bil

d) F=Bl^{2}

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2. When the current in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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3. When the length of the conductor in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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4. When the magnetic field intensity in the current carrying conductor increases, what happens to the force in the conductor which is at right angles to the magnetic field?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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5. The unit for force in a current carrying conductor is _________

a) Newton

b) Tesla

c) Weber/metre

d) Ampere

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6. If the flow of electric current is parallel to the magnetic field, the force will be ________

a) Zero

b) Infinity

c) Maximum

d) Half the original value

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7. The ratio of magnetic force to electric force on a charged particle getting undeflected in a field is ___________

a) 1

b) 0

c) 2

d) 4

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8. If the intensity of magnetic field is 100T, the length of the conductor is 3m and the current in the conductor is 10A, calculate the magnitude of force perpendicular to the electric field.

a) 300N

b) 30N

c) 30kN

d) 3kN

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9. Weakest force in nature is ________

a) Electric force

b) Gravitational force

c) Weak force

d) Magnetic force

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10. The relation between the direction of force and the direction of magnetic field is _________

a) Same direction

b) Opposite direction

c) Perpendicular

d) Unrelated

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## Set 3

1. If the resonant frequency in a series RLC circuit is 50kHz along with a bandwidth of 1kHz, find the quality factor.

a) 5

b) 50

c) 100

d) 500

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2. What is the SI unit for quality factor?

a) Hz

b) kHz

c) MHz

d) No unit

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3. What happens to the quality factor when the bandwidth increases?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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4. What happens to the quality factor when resonant frequency increases?

a) Increases

b) Decreases

c) Remains the same

d) Becomes zero

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5. Resonant frequency is when ___________

a) XL=XC

b) XL>XC

c) XL<XC

d) Cannot be determined

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6. What is the frequency in resonance condition?

a) Minimum

b) Maximum

c) Cannot be determined

d) Zero

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7. The current leads the supply voltage in a series RLC circuit has its frequency _________ the resonant frequency.

a) Above

b) Below

c) Equal to

d) Cannot be determined

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8. What is the power factor of a series RLC circuit under resonance condition?

a) 0

b) 1

c) Infinity

d) 100

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9. In resonance condition, current ________ voltage.

a) Leads

b) Lags

c) Is in phase with

d) Is greater than

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10. What is the correct formula for quality factor?

a) Q=BW*fr

b) Q=BW/fr

c) Q=fr/BW

d) Q=fr2

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## Set 4

1. The total voltage drop across a series of capacitors is __________

a) The voltage drop across any one of the capacitors

b) The sum of the voltage drop across each of the capacitors

c) The product of the voltage drop across each of the capacitors

d) Zero

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2. Capacitors C1, C2 and C3 have voltage drops 2V, 3V and 5V respectively. Calculate the total voltage in the circuit.

a) 10V

b) 2V

c) 5V

d) 0V

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3. What is the voltage across the 2F capacitor?

a) 242V

b) 2V

c) 220V

d) 121V

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4. What is the voltage across the 4F capacitor?

a) 242V

b) 60.5V

c) 22.5V

d) 12.5V

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5. Calculate the voltage across the 6F capacitor.

a) 242V

b) 60.5V

c) 40.33V

d) 12.5V

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6. When capacitors are connected in series, which of the following rules are applied?

a) Voltage divider

b) Current divider

c) Both voltage divider and current divider

d) Neither voltage divider nor current divider

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7. A capacitor does not allow sudden changes in _________

a) Current

b) Voltage

c) Resistance

d) Inductance

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8. Which of the following expressions is correct with respect to the voltage across capacitors in series?

a) V1/V2=C2/C1

b) V2/V1=C2/C1

c) V1*V2=C1*C2

d) V1/C1=V2/C2

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9. Two 4F capacitors are connected in series, calculate the voltage across each if the total voltage is 20V.

a) 10V

b) 5V

c) 20V

d) 0V

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10. Two capacitors having voltage 2F and 4F are connected in series. This combination is connected to a 100V supply, calculate the voltage across the 2F capacitor.

a) 66.67V

b) 33.33V

c) 100V

d) 0V

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## Set 5

1. Which, among the following, is the correct expression for alternating emf generated?

a) e=2Blusin(theta)

b) e=2B^{2}lusin(theta)

c) e=Blusin(theta)

d) e=4Blusin(theta)

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2. What should theta be in order to get maximum emf?

a) 0

b) 90

c) 180

d) 45

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3. Calculate the maximum emf when the velocity is 10m/s, the length is 3m and the magnetic field density is 5T.

a) 150V

b) 100V

c) 300V

d) 0V

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4. When a coil is rotated in a magnetic field, the emf induced in it?

a) Is maximum

b) Is minimum

c) Continuously varies

d) Remains constant

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5. An E.M.F. can be induced by ___________

a) Change in magnetic field

b) Change in the area of cross section

c) Change in angle between magnetic field and area

d) Change in magnetic field, area and angle

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6. What is emf?

a) Force

b) Voltage

c) Current

d) Flux

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7. What is the consequence of motor effect?

a) Current

b) Voltage

c) Electromagnetic induction

d) EMF

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8. The total number of magnetic field lines passing through an area is termed as?

a) Voltage

b) EMF

c) Magnetic flux

d) Magnetic flux density

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9. In an A.C. generator, increase in number of turns in the coil _________

a) Increases emf

b) Decreases emf

c) Makes the emf zero

d) Maintains the emf at a constant value

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10. Find the length of a conductor which is moving with a velocity 0.4m/s in a magnetic field of 8T, inducing an emf of 20V.

a) 50m

b) 5m

c) 6.25m

d) 0.5m