To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


If the current in an AC circuit is given as i = 5A sinωt - π3 when an emf e = 200v sin ωt is applied acrodd thecircuit. The circuit having component only

1.  L and C

2.  L and R

3.  C and R

4.  None of these

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


A step-down transformer is employed to reduce the main supply of AC from 220V to 11V. If the primary coil draws a current of 5A and the secondary supplies a current to 90A, then the efficiency of the transformer is 

1.  10%

2.  95%

3.  90%

4.  80%

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


At resonance, the value of the power factor of the circuit is

1.  1

2.  Zero

3.  Between zero and 1

4.  More than 1

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


In a LCR circuit having L = 8.0 henry, C = 0.5μF and R = 100Ω in series. The resonance frequence in Hz is

1.  250πHz  

2.  600πHz  

3.  500πHz 

4.  500 Hz

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


In a LCR series network, VL = 40V, Vc = 20V and VR = 15V. The supply voltage is 

1.  25V

2.  75V

3.  35V

4.  Zero

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


The ratio of the number of secondary to primary in an ideal transformed from 50 to 550. If the power input is P, then its output power is 

1.  11P

2.  P11

3.  18p111

4.  P

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


Loss in energy in the transformer is due to 

1.  Hysteresis

2.  Eddy current loss

3.  Leakage of flux

4.  All of these

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


An alternating current is given i = i1 cos ωt - i2 sin ωt. The rms current is given by

1.  i1 + i22 

2.  i1 + i22

3.  i12 + i222 

4.  I12 + i222

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level:


In a step-up transformer, the turn ratio is 1: 2. A Leclanche cell (e.m.f. 1.5V) is connected across the primary. The voltage developed in the secondary would be

1. 3.0 v

2. 0.75 v

3. 1.5 v

4. Zero

To view Explanation, Please buy any of the course from below.
Complete Question Bank + Test Series
Complete Question Bank

Difficulty Level: