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General Questions

True or False

"Everyone is wise until he speaks."- (Proverb)

1. An inductance of 0.08 H is larger thanA.

0.0000008 H

B.0.000000008 HC.0.000008 HD.

0.00008 mH

Answer & Explanation

Answer: Option B

Explanation:

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2. A 240 H inductor is equivalent to aA.

0.240 mH inductor

B.0.000240 mH inductorC.240 mH inductorD.

240 H inductor


Answer: Option A

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Explanation:



3. A 2 mH, a 3.3 mH, and a 0.2 mH inductor are connected in series. The total inductance isA.

55 mH

B.less than 0.2 mHC.less than 5.5 mHD.

5.5 mH


Answer: Option D

Explanation:



4. A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance isA.

9.9 mH

B.greater than 5 mHC.9.9 mH or greater than 5 mHD.

less than 0.6 mH


Answer: Option D

Explanation:



5. The voltage across a coil when di/dt = 20 mA/ s and L = 8 H isA.

16 mV

B.160 mVC.1.6 mVD.

2.5 mV


Answer: Option B

Explanation:



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General Questions

True or False

"You cannot shake hands with a clenched fist."- Indira Gandhi

6. A sine wave voltage is applied across an inductor. When the frequency of the voltage is decreased, the currentA.

is increased

B.is decreasedC.does not changeD.

momentarily goes to zero


Answer: Option A

Explanation:



7. Two 10 H inductors are in parallel and the parallel combination is in series with a third 10 H inductor. What is the approximate total reactance when a voltage with a frequency of 7 kHz is applied across the circuit terminals?A.

219 k

B.66 kC.660 kD.

1.3 M


Answer: Option C

Explanation:



8. An ohmmeter is connected across an inductor and the pointer indicates zero ohms. The inductor isA.

good

B.open

C.shortedD.

partly shorted


Answer: Option C

Explanation:



9. Two inductors, L1 and L2, are in parallel. L1 has a value of 25 H and L2 a value of 50 H. The parallel combination is in series with L3, a 20 H coil. The entire

combination is across an ac source of 60 Vrms at 300 kHz. The total rms current isA.

87 mA

B.870 mAC.87 AD.

337 mA


Answer: Option B

Explanation:



10. An inductor, a 1 k resistor, and a switch are connected in series across a 6 V battery. At the instant the switch is closed, the inductor voltage isA.

0 V

B.6 VC.12 VD.

4 V


Answer: Option B

Explanation:



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General Questions

True or

11. The winding resistance of a coil can be increased byA.

increasing the number of turns

B.using a thinner wireC.changing the core materialD increasing the number of turns or using thinner wire

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False

"Weakness of attitude becomes weakness of character."- Albert Einstein

.Answer & Explanation

Answer: Option D

Explanation:



12. An inductance of 0.43 mH is smaller thanA.

43 H

B.430 HC.0.05 HD.

0.00043 H


Answer: Option C

Explanation:



13. An inductor and a resistor are in series with a sine wave voltage source. The frequency is set so that the inductive reactance is equal to the resistance. If the frequency is increased, thenA.

VR ≥ VL

B.VL < VR

C.VL = VR

D.

VL > VR


Answer: Option D

Explanation:



14. The current through a 120 mH coil is changing at a rate of 150 mA/s. The voltage induced across the coil isA.

1.8 mV

B.18 mVC.180 mVD.

1.25 mV


Answer: Option B

Explanation:



15. When the current through an inductor decreases, the amount of energy stored in the electromagnetic fieldA.

increases

B.decreasesC.remains the sameD.

doubles


Answer: Option B

Explanation:



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General Questions

True or False

"Do not wait for leaders; do it alone, person to person."- Mother Teresa

16. Three 15 mH inductors are in series. The total inductance isA.

15 mH

B.30 mHC.45 mHD.

5 mH


Answer: Option C

Explanation:



17. An 18 V power supply is connected across a coil with a winding resistance of 180 . Current flow in the coil is








A.

1 mA

B.10 mAC.100 mAD.

1 A


Answer: Option C

Explanation:



18. A switch, a 220 resistor, and a 60 mH inductor are in series across a 20 V battery. What is the current through the inductor two time constants after the switch is closed?A.

91 mA

B.78 mAC.57 mAD.

400 mA


Answer: Option B

Explanation:



19. A 320 H coil is in series with a 3.3 k resistor. How long does it take for current to build up to its full value?A.

5.28 s

B.5.28 msC.5.28 sD.

528 s


Answer: Option A

Explanation:



20. Five inductors are connected in series. The lowest value is 8 μH. If the value of each inductor is twice that of the preceding one, and if the inductors are connected in order of ascending values, the total inductance isA.

8 H

B.32 μHC.64 μHD.

248 μH


Answer: Option D

Explanation:



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General Questions

True or False

"Weakness of attitude becomes weakness of character."- Albert Einstein

21. The inductance of an iron-core coil decreases ifA.

the number of turns is decreased

B.the iron core is removedC.the length of the coil decreasesD.

none of the above


Answer: Option A

Explanation:



22. The following coils are in parallel: 75 H, 40 H, 25 H, and 15 H. The total inductance is approximatelyA.

6.9 H

B.14 HC.2.2 HD.

155 H



Answer: Option A

Explanation:



23. When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic fieldA.

is halved

B.quadruplesC.doublesD.

does not change


Answer: Option A

Explanation:



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