The value of current I_{1} in the circuit shown below is

- a)0 A
- b)60 A
- c)20 A
- d)40 A

Correct answer is option 'C'. Can you explain this answer?

SONIKA AMAR answered • 2 hours ago

Since X_{L} = X_{L}, therefore given circuit will be at resonance

∴

∴

Assertion (A): When a current changes in a circuit, the magnetic fiux linking the same circuit changes and an emf is induced in the circuit.

Reason (R): Mutual inductances is the bilateral property of the linked circuit.

Reason (R): Mutual inductances is the bilateral property of the linked circuit.

- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.

Correct answer is option 'B'. Can you explain this answer?

SARITA NRAIN answered • 2 hours ago

The reason for assertion is that, emf is induced due to Faraday’s law of electromagnetic induction. Reason (R) and assertion (A) are individually true.

The voltage and current in an a.c, circuit are given by

v= 100 sin 314t; i = 10 sin 314 t?

The average power in the circuit is

v= 100 sin 314t; i = 10 sin 314 t?

The average power in the circuit is

- a)225 W
- b)500 W
- c)250 W
- d)600 W

Correct answer is option 'B'. Can you explain this answer?

DURGI DEVI answered • 2 hours ago

∴ P

Now,

(since v and i in phase)

∴

A constant voltage but variable frequency ac source feeds L and C in parallel as shown below:

The impedance seen by source is Z

1. Z is zero when f = 0.

2. Z is zero when f = infinity.

3. Z is infinite when f = 0.

4. Z is infinite when f = infinity.

5. resonant frequency, ω_{f} = rad/s.

6.

7.

From above, the correct answer is

The impedance seen by source is Z

1. Z is zero when f = 0.

2. Z is zero when f = infinity.

3. Z is infinite when f = 0.

4. Z is infinite when f = infinity.

5. resonant frequency, ω

6.

7.

From above, the correct answer is

- a)3 , 4 , 7
- b)1 , 2 , 6
- c)3, 4, 5
- d)1, 2, 5

Correct answer is option 'D'. Can you explain this answer?

RAJNI DEVI answered • 2 hours ago

Resonant frequency,

Also,

When f = 0, ω = 0 and z = 0.

When f = ∞, co = ∞ and z= 0.

Also,

When f = 0, ω = 0 and z = 0.

When f = ∞, co = ∞ and z= 0.

The power loss in watts in the resistor R shown below is

- a)175 watts
- b)25 watts
- c)225 watts
- d)62.5 watts

Correct answer is option 'A'. Can you explain this answer?

KIRNA DEVI answered • 13 hours ago

V_{R} = (10 + 5 V_{R}) x R

Given, V_{R }= 5 V

So, 5 = ( 10+ 5 x 5 ) R

or,

∴ Power loss in R is

Given, V

So, 5 = ( 10+ 5 x 5 ) R

or,

∴ Power loss in R is

The resonant frequency of the given series circuit is

- a)
- b)
- c)
- d)

Correct answer is option 'B'. Can you explain this answer?

NAINCY PRAKASH answered • 13 hours ago

L_{eq} = L + L + 2 M

= 2 + 2 + 2 x 1 = 6 H

∴

= 2 + 2 + 2 x 1 = 6 H

∴

In a purely resistive circuit, the average power

P_{av} is______the peak power P_{max}.

P

- a)double
- b)non-half of
- c)one-fourth of
- d)equal to

Correct answer is option 'B'. Can you explain this answer?

INDU SHARMA answered • 13 hours ago

Instantaneous power in a purely resistive circuit is

∴

∴

The equivalent inductance for the following inductive circuit is

- a)28 H
- b)30 H
- c)32 H
- d)34 H

Correct answer is option 'B'. Can you explain this answer?

DIVYA CHAUHAN answered • 13 hours ago

L_{eq} = (10 + 2-2) + (10 + 2 - 2)+ (10 + 2 -2 ) = 30 H

What is the equivalent inductance between the terminals A and B for the circuit shown below? (Given, M= 111)

- a)
- b)
- c)OH
- d)

Correct answer is option 'A'. Can you explain this answer?

JYOTI RANDEEP answered • 13 hours ago

Due to same polarity, the effect of mutual inductance will he positive.

∴

∴

In series circuit shown below, for series resonant frequency of 1 rad/s, the value of coupling coefficient K will be

- a)1.0
- b)0.5
- c)0.25
- d)zero

Correct answer is option 'C'. Can you explain this answer?

SUMAN LATA answered • 13 hours ago

Using coupling coefficient formula, wo have

Now, for resonance,

or,

or, 15 + 12 k = 18

or,

Now, for resonance,

or,

or, 15 + 12 k = 18

or,

AARYAN RAVI asked • 1 hour ago

Figure shown below represents a d.c. 10 V voltage source as well as a 10 V a.c. 50 Hz voltage source while Z_{1} and Z_{2} are two unknown impedances. When Z_{1} is connected across 10V d.c. source, it draws a current of 10 A while it draws a current of 8 A if connected across 10V a.c. source.

Now, when Z_{2} is connected across 10 V d.c. source, it does not draw any current while it draws a current of 5 A if connected across 10 V a.c. source.

Q. What are the elements in Z_{1} and Z_{2}?

Now, when Z

Q. What are the elements in Z

- a)Z
_{1}= (1 - j0 .25) Ω , Z_{2}= j2 Ω - b)Z
_{1}= (1 + j0 .75) Ω , Z_{2}= -j2 Ω - c)Z
_{1}= (1 - j0.25) Ω, Z_{2}= -j2 Ω - d)Z
_{1}= (1 + j0.25) Ω, Z_{2}= j2 Ω

Correct answer is option 'B'. Can you explain this answer?

The power consumed in an inductive circuit will be

- a)VIcosφ
- b)VIsinφ
- c)VI
- d)none of these

Correct answer is option 'A'. Can you explain this answer?

ANJU BALA answered • 13 hours ago

In a purely inductive circuit, power consumed = Q = VIsin φ. In inductive circuit (having both R and L) power is consumed by resistor R which is P = VI cos φ.

The overall inductance of two coils connected in series, with mutual inductance opposing selfinductance is L_{1}; with mutual inductance aiding self-inductance the overall inductance is L_{2}. The mutual inductance Mis given by

- a)(L
_{1 }- L_{2}) - b)
- c)
- d)

Correct answer is option 'C'. Can you explain this answer?

ANITA KUMARI answered • 13 hours ago

Let the self inductances of two coils be L'

Then, L

So, L

or,

SAMARTH NEGI asked • 1 hour ago

A two terminal black box contains one of the R-L-C elements. When the black box is connected to a 220 V ac supply, the current through the source is I. When a capacitance of 0.1 F is inserted in series between the source and the box, the current through the source is 2I The element is

- a)a resistance
- b)an inductance
- c)a capacitance
- d)it is not possible to determine the element

Correct answer is option 'B'. Can you explain this answer?

A non-alternating periodic waveform is shown below, It’s from factor is

- a)2√2
- b)1/√2
- c)√2
- d)2

Correct answer is option 'C'. Can you explain this answer?

SEEMA DEVI answered • 13 hours ago

Here, time period is, T = 20 ms; between 10 ms < t < 20 ms, i(t) = 0 A.

∴

Also,

= 50 x 0.01 =0.5 A

∴

∴

Also,

= 50 x 0.01 =0.5 A

∴

SAURABH KUMAR asked • 1 hour ago

A series circuit containing passive elements has the following current and applied voltage:

The circuit elements

The circuit elements

- a)may be resistance and inductance
- b)may be inductance, capacitance and resistance
- c)either (a) or (b)
- d)may be resistance and capacitance

Correct answer is option 'C'. Can you explain this answer?

VISHAL SHARMA asked • 1 hour ago

Assertion (A): In an alternating circuit, if the current is (4 - j3) amperes and the impressed voltage is (100 - j50) volts, the reactive power in the circuit is 100 VA.

Reason (R): True power is the real part of (VI).

Reason (R): True power is the real part of (VI).

- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true but R is not the correct explanation of A.
- c)A is true but R is false.
- d)A is false but R is true.

Correct answer is option 'D'. Can you explain this answer?

Kanhai Lal asked • 8 hours ago

In a split phase motor

- a)the starting winding is connected through a centrifugal switch
- b)the running winding is connected through a centrifugal switch
- c)both starting and running windings are connected through a centrifugal switch
- d)centrifugal switch is used to control supply voltage

Correct answer is option 'A'. Can you explain this answer?

Vaishali More asked • 8 hours ago

- a)Both A and R are correct and R is correct explanation of A
- b)Both A and R are correct but R is not correct explanation of A
- c)A is true, R is false
- d)A is false, R is true

Correct answer is option 'B'. Can you explain this answer?

Amit Parashar asked • 9 hours ago

A 50 Hz, 11 kV, 3 phase alternator with earthed neutral having a reactance of 3 ohms per phase and is connected to a bus bar through a circuit breaker, if the distributed capacitance upto CB between the phase and neutral is 0.01 μ F.

What is the peak re striking voltage?

- a)18.36 kV
- b)17.96 kV
- c)15.96 kV
- d)12.65 kV

Correct answer is option 'B'. Can you explain this answer?

Satyajit Padhi asked • 10 hours ago

Consider the following statements:

1. The effect of feedback is to reduce the system error.

2. Feedback increases the gain of the system in one frequency range but decreases in another.

3. Feedback can cause a system that is originally stable to become unstable.

Which of these statements are correct ?

1. The effect of feedback is to reduce the system error.

2. Feedback increases the gain of the system in one frequency range but decreases in another.

3. Feedback can cause a system that is originally stable to become unstable.

Which of these statements are correct ?

- a)1, 2 and 3
- b)1 and 2
- c)2 and 3
- d)1 and 3

Correct answer is option 'D'. Can you explain this answer?

Jeya Kumar asked • 12 hours ago

A 2-terminal network consist of one of the RLC elements. The element is connected to an ac supply. The current through the element is IA when an inductor is inserted in series between the source and element 2IA the current through the element becomes. What is this element ?

- a)A resistor
- b)An inductor
- c)A capacitor
- d)Cannot be a single element

Correct answer is option 'C'. Can you explain this answer?

Bhavan Verma asked • 13 hours ago

A power diode is in the forward conduction mode and the forward current is now decreased. The reverse recovery time of the diode is t_{rr} and the rate of fall of the diode current is di/dt. What is the stored charge?

- a)
- b)
- c)
- d)

Correct answer is option 'B'. Can you explain this answer?

Sanskruti Mahajan asked • 16 hours ago

What happens when the centrifugal switch in the starting winding of a single - phase induction motor fails to open ?

- a)The motor stops quickly
- b)The starting winding will overheat
- c)The motor runs at reduced speed
- d)None of the above

Correct answer is option 'B'. Can you explain this answer?

Vipin Azad asked • 16 hours ago

A d.c. to d.c. chopper operates from a 48 V battery source into a resistive load

of 24 f~. The frequency of the chopper is set to 250Hz. What is the average

and rms load current and load power values when (a) chopper on-time is 1 ms,

(b) chopper on-time is 3 ms.

of 24 f~. The frequency of the chopper is set to 250Hz. What is the average

and rms load current and load power values when (a) chopper on-time is 1 ms,

(b) chopper on-time is 3 ms.

- a)6W
- b)12W
- c)24W
- d)48W

Correct answer is option 'C'. Can you explain this answer?

Sunil Manjani asked • 16 hours ago

Diffraction of electromagnetic waves

- a)is caused by reflections from the ground
- b)arises only with spherical wave fronts
- c)will occur when the waves pass through a large slot
- d)may occur around the edge of a sharp obstacle

Correct answer is option 'D'. Can you explain this answer?

Potu Madhavi asked • 16 hours ago

For the same voltage drop, increasing the voltage of a distributor n-times.

- a)reduces the x-section of the conductor by n times
- b)increases the x-section of the conductor by n times
- c)reduces the x-section of the conductor by n
^{2}times - d)increases the x-section of the conductor by n
^{2 }times.

Correct answer is option 'A'. Can you explain this answer?

Shaik Shahina asked • 17 hours ago

consider the following statements :

1. The effect of feedback is to reduce the system error

2. Feedback increases the gain of the system in one frequency range but decreases in another.

3. Feedback can cause a system that is originally stable to become unstable

Which of these statements are correct ?

1. The effect of feedback is to reduce the system error

2. Feedback increases the gain of the system in one frequency range but decreases in another.

3. Feedback can cause a system that is originally stable to become unstable

Which of these statements are correct ?

- a)1, 2 and 3
- b)1 and 2
- c)2 and 3
- d)1 and 3

Correct answer is option 'D'. Can you explain this answer?

Jitendra Kumar asked • 17 hours ago

The data sheet for a certain JFET (Junction Field Effect Transistor) indicates that I_{DSS} (drain to source current with gate shorted) = 15 mA and V_{GS} (off) (Cut – off value of gate to source voltage) = – 5V.

- a)58.8 mA
- b)29.4 mA
- c)9.6 mA
- d)5.4 mA

Correct answer is option 'D'. Can you explain this answer?

Taranhaar Kumar asked • 20 hours ago

Voltage remaining constant, if the frequency is increased then

- a)eddy current losses will decrease
- b)hysteresis loss will decrease
- c)eddy current losses will remain unchanged
- d)hysteresis losses will remain unchanged

Correct answer is option 'C'. Can you explain this answer?

Anubhab Kundu asked • 20 hours ago

When is tanφ negative?

- a)When inductive reactance is less than capacitive reactance
- b)When inductive reactance is greater than capacitive reactance
- c)When inductive reactance is equal to capacitive reactance
- d)When inductive reactance is zero

Correct answer is option 'C'. Can you explain this answer?

Venkata Krishna asked • 20 hours ago

If for sinusoids of same frequency but ofdifferent amplitudes and phase difference areadded the resultant is a

- a)sinusoid of the same frequency
- b)sinusoid of double the original frequency
- c)sinusoid of half the original frequency
- d)non sinusoid

Correct answer is option 'B'. Can you explain this answer?

Sunil Manjani asked • 21 hours ago

The Hartley-Shannon theorem sets a limit on the

- a)highest frequency that may be sent over a given channel
- b)maximum capacity of channel with a given noise level
- c)maximum number of coding levels in a channel with a given noise level
- d)maximum number of quantizing levels in a channel with a given noise level

Correct answer is option 'B'. Can you explain this answer?

Manoj Pawar asked • 21 hours ago

In the optimum generator scheduling different power plants, the minimum fuel cost is obtained when

- a)only the incremental fuel cost of each plant is the same
- b)the penalty factor of each plant is the same
- c)the ratio of the incremental fuel cost to the penalty factor of each plant is the same.
- d)the incremental fuel cost of each plant multiplied by its penalty factor is the same

Correct answer is option 'D'. Can you explain this answer?

Manoj Sharma asked • 21 hours ago

In a thyrite lightning arrester the resistance

- a)varies linearly with applied voltage
- b)increases with the applied voltage
- c)Decreases linearly with the applied voltage
- d)is high at low current and low at high current

Correct answer is option 'D'. Can you explain this answer?

Rupak Mandal asked • 22 hours ago

In a synchronous motor, the breakdown torque is

- a)directly proportional to applied voltage
- b)directly proportional to the square of the applied voltage
- c)inversely proportional to applied voltage
- d)none of the above

Correct answer is option 'A'. Can you explain this answer?

Shital Devake asked • 23 hours ago

Galloping in transmission line conductors arises generally due to

- a)Asymmetrical layers of ice formation
- b)Vortex phenomenon in light winds
- c)Heavy weight of the line conductors
- d)Adoption of horizontal conductor configurations

Correct answer is option 'A'. Can you explain this answer?

Pinkesh Patel asked • yesterday

The Voltage Source Inverter (VSI) shown in the figure below is switched to provide a 50Hz, square wave ac output voltage v_{o} across an RL load. Reference polarity of v_{o} and reference direction of the output current i_{o} are indicated in the figure. It is given that R = 3 ohms, L = 9.55mH.

Appropriate transition i.e., Zero Voltage Switching (ZVS) / Zero Current Switching (ZCS) of the IGBTs during turn-on / turn-off is

- a)ZVS during turn off
- b)ZVS during turn-on
- c)ZCS during turn off
- d)ZCS during turn-on

Correct answer is option 'D'. Can you explain this answer?

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