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12.

13.

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LJ View Answer J Discuss

In a certain loaded transformer, the secondary

voltage is one-fourth the primary voltage. Thsecondary current is

A. one-fourth the primary current

B. four times the primary current

C. equal to the primary current

one-fourth the primary current and equal tothe primary current

Answer: Option B

Explanation:

No answer description available for this question.Let us discuss.

L_] View Answer _,_. Discuss

A certain transformer has a turns ratio of 1 and a

0.85 coefficient of coupling. When 2 V ac isapplied to the primary, the secondary voltage is

A. 1.7V

B. 0.85‘v’

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Explanation:


|__'] View Answer J4 Discuss

2. A string of five series resistors is connectedacross a 6 V battery. Zero voltage is measuredacross all resistors except R3. The voltage across

R3 is

A. 0V

B 1.2V

C. 6V

D 0.6 V

Answer: Option C

Explanation:


|_] View Answer 4:, Discuss

3. A series circuit consists of three resistors with

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+ Series Circuits - General Questions

Series Circuits - True or False

1. When a fourth resistor is connected in series with

three resistors, the total resistance

A. increases by one-fourth

B increases

C. decreases

D remains the same

Answer: Option B

Explanation:


L_l View Answer 44 Discuss

2. A string of five series resistors is connectedacross a 6 V battery. Zero voltage is measuredacross all resistors except R3. The voltage across

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resistance is

A. less than 120 n

B. the average of the values

C. 720 L":

D. 120 Q

|__] View Answer J4 Discuss

4. A certain series circuit consists of a 1/8 Wresistor, a 1/4 W resistor. and a 1/2 W resistor. Thetotal resistance is 1200 Q. If each resistor isoperating in the circuit at its maximum powerdissipation. total current flow is

A. 27 mA

8. 2.7 mA

C. 19 mA

D. 190 mA

Answer: Option A

Explanation:

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10. All the voltage drops and the source voltage added

together in a series circuit is equal to

A. the total of the voltage drops

B. the source voltage

C. zero

D. the total of the source voltage and thevoltage drops

Answer: Option C

Explanation:


#L_'] View Answer .5: Discuss ;

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B. 50%

C. 1%

D. 100%

LJ View Answer 44 Discuss

8. A 20 kHz pulse waveform consists of pulses thatare 15 p. 3 wide. The duty cycle

A. is 1%

B. is 30%

C. is 100%

D. cannot be determined

Answer: Option B

Explanation:


|_J View Answer ._.4 Discuss

9. If the peak of a sine wave is 13 V. the peak-to-peak

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3. The output of a certain voltage divider is 12 V withno load. When a load is connected. the outputvohage

A. decreases

8 increases

C. remains the same

D becomes zero

Answer: Option A

Explanation:


L.'JW as Discuss

4. A certain voltage divider consists of two 12 k n

resistors in series. Which of the following loadresistors will have the most effect on the output

vohage?

A. 1M!)

B. 24 kg

1"" 1OIJA

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B. 9384-5130 k0.

C. 180 4-38.3° k0.

D. 19.2 /_/-38.3° k!)

L] View Answer Q; Discuss

10. In applying the superposition theorem,

the sources are considered one at a timeA. with all others replaced by their internal

impedance

B. all sources are considered independently

C. all sources are considered simultaneously

the sources are considered one at a timeD. with all others replaced by their internal

resistance

Answer: Option A

Explanation:


L] View Answer _,_, Discuss

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C. less than 5.5 mH

D. 5.5 mH

|_'_1 View Answer A; Discuss

4. A 5 mH, a 4.3 rnH. and a 0.6 mH inductor areconnected in parallel. The total inductance is

A. 9.9 mH

B greater than 5 mH

C. 9.9 mH or greater than 5 mH

D less than 0.6 mH

Answer: Option D

Explanation:


|_'_J View Answer _._, Discuss

5. The voltage across a coil when di/dt = 20 mA/ p s

and l. = B u H is

A. 16mV

B. 160 mV

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C. -60°

D. 480°

|__]View Answer 44 Discuss

In a series RC circuit, 12 Watts) is measured across

the resistor and 15 V(rms) is measured across the

capacitor. The rms source voltage is

A. 3V

B 27V

C. 192‘»!

D 1.9V

Answer: Option C

Explanation:


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a. 14uHc. 2.2 pH0. 155 pH

. ourL_] View Answer w Discuss

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

A. is quartered

B. quadrupies

C. doubles

0. does not change

Answer: Option A

Explanation:


|_J View Answer Q; Discuss

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5. When the current through the coil of anelectromagnet reverses, the

A. direction of the magnetic field reverses

direction of the magnetic field remains3‘ unchanged

C. magnetic field expands

D. magnetic field collapses

Answer: Option A

Explanation:


L_‘] View Answer 4;, Discuss '-.‘_'_~fl

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6. The primary winding of a transformer has 110 V asacross it. What is the secondary voltage if the

turns ratio is 8?

A. 8.8 V

B. 88 V

C. 880 V

D. 8800 V

Answer: Option C

Explanation:

V2/V‘l = NZ/N'l

Turns ratio = N2/N1 = 8.

V2/110=8

V2=8X1TD

V2 = 880v.

LJView Answer gDisouss ‘ i

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Exercise :: Series Circuits - GeneralQuestions

4 Series Circuits — General Questions

Series Circuits - True or False

6. When one of three series resistors is removed

from a circuit and the circuit is reconnected, the

current

A. increases

B. increases by one-third

(3. decreases by one-third

decreases by the amount of current throughthe removed resistor

Answer: Option A

Explanation:


LJ View Answer 4,; Discuss

7. The total power in a certain circuit is 12 W. Each of

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Exercise :: Magnetism and Electromagnetism- General Questions

Magnetisr‘n and Electron‘iagnetism - General-. Questions

Magnetism and Electromagnetism — True orFalse

1. When the speed at which a conductor is movedthrough a magnetic field is increased, the induced

vohage

A. increases

B decreases

C. remains constant

D reaches zero

Answer: Option A

Explanation:

No answer description available for this question.

Let us discuss.

|_"J View Answer Q; Discuss

2. The induced voltage across a coil with 250 turns

””3“ .iil 37% El 4:37 pmAnswer: Option A

Explanation:


L] View Answer 4; Discuss

The total power in a certain circuit is 12 W. Each ofthe four equal-value series resistors making up thecircuit dissipates

A. 12W

B 48W

C. 3W

D 8W

Answer: Option C

Explanation:


L]W _s Discuss

8. The following resistors (one each) are connected

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Exercise :: Inductors ~ General Questions

4. inductors — General Questions

Inductors - True or False

11. The winding resistance of a coil can be increased

byA. increasing the number of turns

B. using a thinner wire

C. changing the core material

increasing the number of turns or usingthinner wire

Answer: Option D

Explanation:


|_J View Answer Q; Discuss

12. An inductance of 0.43 mH is smallerthan

A. 43 pH

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B. 111 At/Wb

C. 11 At/Wb

D. ‘l At/Wb

L] View Answer Q4 Discuss

A coil of wire is placed in a changing magnetic

field. lfthe number ofturns in the coil isdecreased, the voltage induced across the coil will

A. increase

B. decrease

C. remain constant

D. be excessive

Answer: Option B

Explanation:


LJ View Answer _i,_, Discuss

What is the flux density when the flux is 5.5 u Wb

and the cross-sectional area is 6 x 10-3 m2?

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|_] View Answer #1,, Discuss

The induced voltage across a coil with 250 turnsthat is located in a magnetic field that is changingat a rate of 8 Wb/s is

A. 1,000 V

B 2,000 V

C. 31.25 V

0 3,125 V

Answer: Option B

Explanation:


|_] View Answer by, Discuss

For a given wirewound core, an increase in currentthrough the coil

A. reverses the flint lines

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20. if a 24 V and a 6 V battery are series opposing, the

total voltage is

A. 30 V

B. 24V

C. 18 V

D. 0V

Answer: Option C

Explanation:


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B. ‘IUD mA

C. 282 mA

D. “I41 mA

L_] View Answer 4;, Discuss i

14. An ac circuit consists of a resistor and a capacitor.

To increase the phase angle above 45“. thefollowing condition must exist:

A. R = Xc

B. R >XC

C. R< XC

D. R = 5X3

Answer: Option C

Explanation:


L] View Answer 44 Discuss

15. What is the angular difference between +j4 and -

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D. 9.7 T

|__J View Answer by Discuss

9. The unit for reluctance is

A. tesla

B At/Wb

C. At/m

D Wb

Answer: Option B

Explanation:


|__1 View Answer w Discuss

10. lfthe steel disk in a crankshaft position sensorhas stopped with the tab in the magnet's air gap,

the induced voltage

A. increases

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””3“ .nl 34% [21 4:52 pmrate of 150 mA/s. The voltage induced across thecoil is

A. 1.8 mV

B. 18 mV

C. 180 mV

D. 1.25 mV

|_1 View Answer by Discuss

15. When the current through an inductor decreases,the amount of energy stored in theelectromagnetic field

A. increases

8. decreases

C. remains the same

D. doubles

Answer: Option B

Explanation:


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L] View Answer _1_;, Discuss

4. If the cross-sectional area of a magnetic fieldincreases, but the flux remains the same, the fluxdensny

A. increases

13 decreases

0. remains the same

D doubles

Answer: Option B

Explanation:


LiW _«._~. Discuss

5. When the current through the coil of an

electromagnet reverses. the

A. direction of the magnetic field reverses

direction of the magnetic field remainsunchanged

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B. 38.5 L"!

C. 3.1 Q

U. 31 f1

|_J View Answer .44 Discuss

2. If750 M. is flowing through 11 km of resistance.what is the voltage drop across the resistor?

A. 8.25 V

B. 82.5 V

C. 14.6 V

D. 146 V

L] View Answer J Discuss

3. The formula to find i when the values of V and R

are known is

A. I = VR

B. if = R/V

C. V=IR

F. I It!!!

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|__] View Answer Q3 Discuss ‘-"__-i

The parallel combination of a 470 n resistor and a1.5 kn resistor is in series with the parallelcombination of five 1 kn resistors. The sourcevoltage is 50 V. The percentage of the load currentthrough any single 1 kn resistor is

A. 25%

B. 20%

C. 100%

D. 50%

Answer: Option B

Explanation:


Let us discuss.

L'_'J View Answer __u Discuss

A certain Wheatstone bridge has the followingresistor values: R1 =10 kn, Fig = 720 n, and R4 =

2.4 km. The unknown resistance is

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B. 43.7/_”68.6o Q

C. 43.7421.4° 0

D. 12.9468.6° Q

L] View Answer _,_, Discuss

15. In order to get maximum power transfer from acapacitive source, the load must

A have a capacitive reactance equal to circuit' resistance

B have an impedance that is the complex' conjugate of the source impedance

C. be as capacitive as it is inductive

D. none of the above

Answer: Option B

Explanation:


L] View Answer Q; Discuss

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Exercise :: Magnetism and Electromagnetism- Genera! Questions

Magnetism and Electrontagnetisni - General+ Questions

Magnetism and Electromagnetism - True orFalse

21. An electromagnetic field exists only when there is

A. an increasing current

3. decreasing current

C. voltage

U. current

Answer: Option D

Explanation:


Let us discuss.

|_"J View Answer A; Discuss

22. When a solenoid is activated, the force that moves

the plunger is

A. an electromagnetic field

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Exercise :: Transformers - General Questions

.4. Transformers — General Questions

Transformers A True or False

1. What We. rating is required for a transformer thatmust handle a maximum load current of 8 A with asecondary voltage of 2 W?

A. 4 kVA

B 0.25 kVA

C. To kVA

D 8 kVA

Answer: Option C

Explanation:


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0. 62,500 :1

L] View Answer Q; Discuss 2:»,

5. A certain transformer has 400 turns in the primarywinding and 2,000 turns in the secondary winding.The turns ratio is

A. 0.2

B. 0.4

C. 5

D. 25

Answer: Option C

Explanation:


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8. The conductance of an 8 ohm resistance

is

A. 12.5 ms

B. 8 m8

C. 12 S

D. 125 m8

Answer: Option D

Explanation:

No answer description available for this

question. Let us discuss.

L'JView Answer 2.;Discuss ".3;

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L] View Answer 43 Discuss' I.

"A.

42. A short circuit will have:

a small current flow

a large current flow

no current flow

99

?”?

some current flow

Answer: Option B

EXplanation:

No answer description available for this

question. Let us discuss.

L] View Answer 55:5. Discuss‘II

Us.l_ I

43. The basic difference between a fuse

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D. l=V/R

LJ View Answer _t_, Discuss

A resistor is connected across a 50 V source.

What is the current in the resistor if the color code

is red, orange. orange, silver?

ZmAA.

B. 2.2 mA

C. 214mA

D. 214mA

Answer: Option B

Explanation:


L,”_] View Answer __t,_. Discuss

Approximately how manyr milliamperes of current

flow through a circuit with a 40 V source and 6.8 kn of resistance?

A. 27.2 mA

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15. The primary winding of a power transformer

should always be

A.

B

C.

D

open

shoned

switched

fused

Answer: Option D

Explanation:


Let us discuss.

El View Answer 3 Discuss ‘2; 5

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Exercise :: Inductors - General Questions

+ inductors — General Questions

Inductors — True or False

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

A. the number of turns is decreased

B the iron core is removed

0. the length of the coil decreases

D none of the above

Answer: Option A

Explanation:


L] View Answer 4; Discuss

22. The following coils are in parallel: 75 i1 H, 40 i1 H,25 i1 H, and 15 H H. The total inductance is

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5. Which of the following is a non-polar dielectric ?

(A) Polystyrene

(B) Phenolic plastics

(C) Plasticized cellulose acetate

(D) Castor oil.

6 g The impurity In liquid dielectric which hassignificant effect in reducing the breakdown strength,is

(A) dust

(B) dissolved gases

(C) moisture

(D) ionic impurities.

25. The angular velocity of geo—stationarvr satellite is

Equal to the angular velocity of earth.Less than the angular velocity of earth.More than the angular velocity of earthNone of the a hove.

26. The batteryr operated ore—amplifier with a consumption of 10Watts can work on battery of12 volt, 100 AH having efficiency,r of50% for

120 hrs.60 hrs.100 hrs.10 hrs.

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In the 3-phase inverter circuit shown: the load is balanced and the gatingscheme is 180°—conduction modeAll the switching devices are ideal

F ...................... 3

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s. a so. 3.. l.. i

j-pliase invtrtcr 5.3;Eh£$.h!§flfirfll‘?99ni

Ans: 3

[7] The rms value of load phase voltage is [GATE2012}a. 108.1Vb. 141.4Vc. 212.2Vd. 282.8V

Ans: B

8] If the dc bus voltage VfBDOV. the power consumed by 3—phase loadis [GATE20121a. 1.5kWb. 2.0kWc. 2.5kWd. 3.0mr

Ans: D

Till iTll 12:41? PM

3. A good dielectric should have all the followingproperties EXCEPT

{A} high mechanical strength

[3] high resistance to thermal deterioration

{C} high dieiectric loss

(D) freedom from gaseous inclusions.

9. The variety of paper used for insulation purpose is

{A} blotting paper

[3} rice paper

{C} craft paper

[0) mill-board.

GEE AFISWEF

1 0. Which variety of mice is hard and brittle ?

[14] Voltage drop is the:(a) Maximum potential(b) Difference in potential between two points(c) Voltage at the end of a circuit(d) Voltage produced by a sourceAns: BAnswer I

[15] A 240V, 60W lamp has a working resistanceof:(a) 1400 ohm(b) 60 ohm(c) 960 ohm(d) 325 ohm

; Answer I

Solution Hint:[1] UnitsEnergy - Watt-hrVohage-voflsPower - watts[2] Current = Charge in coulomb/ Time in sec[3] Conductance = i/Resistance[15] P = VZ/R

Thanks for reading.

REVATHY PARIRAJAN

45 questions

Question 9 : When a UJT is used fortriggering of an SCR,the wave shape of the voltage obtained from UJT circuit is a

Option-1 : '-._.-' sine wave

Option-2 : a!!! sawtooth wave

Option-3 : '._.-' trapezoidal wave

Option-4 : square wave

10- The number 3.2 x 10-5 A expressed using a metric prefix is[A]. 32 pA a[B]. 3.3 M[e]. 320 me.[D]. 32:30 mA

Answer: Option A

[14] For an inverter Gp—alTlp; what will be the equivalent output resistance?(a) Zero(b) Infinity(c) Relative forward resistance(d) Same as the input resistanceAns: AAnswerl

n . II P: “I - flfiJ All

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4. The maximum output voltage or a certain IOW—pBSS filter 15 15 V. The output voltage at the critical frequency 15

A. D V

B 15 V

C. 10.501!

D 21.21V

[1] In a uniform electric field. field lines and equipotentialsa) Are parallel to one anotherb) Intersect at 45 degc) Intersect at 30 degd) Are orthogonalAns:D

2) Another name for Beta is A) Current amplifying factor, B) power amplification factor c) voltage amplification factor

3) In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V.The value of the source voltage isA. 125 VB. 250 VC. 290 VD. 40 V

4) For a given wire wound core, an increase in current through the coilA) reverses the flux linesB) decreases the flux densityC) increases the flux densityD) causes no change in flux density

5) Approximately how many milliamperes of current flow through a circuit with a 40V source and 6.8k of resistanceA) 5.9mAB)59mAC)124mAD) None of above

6) What Are three Basic Electrical QuantitiesA) Resistance, Voltage, CurrentB) Inductor, Resistance, CapacitorC) Power Voltage CurrentD) None

7) Street Lights Are Connected inA. ParallelB. SeriesC. Series-ParallelD. None

8) Conductance is reciprocal ofA. ResistanceB. capacitanceC. inductanceD. none

9) Half watt is equal toA. 500mWB. 5000mWC. 50mWD. none

10) In two input NAND gate, both input are high, output will beA. LowB. HighC. BothD. None

11) Resistivity unit isA ohm-mB ohm/mC ohmD none

12) In a certain transformer, the input power to the primary is 120 W. If 8.5 W arelost to the winding resistance, what is the output power to the load, neglectingany other lossesA. 111.5WB. 120WC. 8.5WD. none

13. Which kind of motor is used in Ceiling fan A. capacitormotorB. Shaded PoleC. UniversalD. None

14. Input impedence of op amp isA. highB. lowC. mediumD. none

15. which one is not characteristics of osscilatorA. negative feedbackB. no InputC. Sine OutputD. none

16. 300 Joules is consumed in 15 sec. power isA 20WB 30WC 40WD none

17. Diode can be used asA. frequency multiplier (Correct)B. Some other options

18. Dielectric strength of mica isA. 500KV/mmB. 50MV/mmC. 2500KV/mmD. none

1.30db power gain equivalent amplification factor?

2. electromotive force is provided by

3 two terminal variable resistor? rheostat

4 energy is needed to do work

5 TXCO osscilator is more stable than LC, but for high freq LC is used

6. pinch off value of jfet is that value at which current becomes constant

7. butyl rubber is not used for high freq applications

8. polar dielectric are used for DC and power freq

9. nylon is polar dielectric

10. corona - faint voilet glow

11. van de graff generator

12. tesla coil is high resonant transformer

13. breakdown strength depends upon

14. liquid dielectric strength is 50KV/cm

15. vaccum insulation is used in all except (EHT of color TV)

16. transformer question repeat

17. When the frequency of the voltage applied to a series RC circuit is decreased, the impedance

18. how much continous current can be drawn from 60ah battery for 14 hours?

19. a resistor of 50kohm has conductance of

20. V=3v, R=68ohm, power is? (132mW)

21. n type have minority (holes)

22. what is pinch off voltage in JFET

23. Transformers contribute to radio interference due to(A) corona discharges in air(B) internal or partial discharges in insulation(C) sparking(D) any of the above

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GENERAL PORTION

1. Doab mean?

2. Where the mother of Hazrat Muhammad S.A.W buried?

3. Synonym of waive

4. PAIDAC garden to Hazrat Muhammad S.A.W

5. pitras bukhari was writer of which language? (urdu)

6. they felt humilited because they (have been, had been) cheated

7. in addition (to enhancing thier skill, thier skill to enhance)

8. man and the man and man and superman is written by bernard shaw.

9. Cataract is (water fall, Rush of water, both, all of the above)

10. old testament is (zabur, torah, injeel)

87/100

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