Home
Class 12
PHYSICS
An electric motor operating on 50 volt D...

An electric motor operating on 50 volt D.C. supply draws a current of 10 amp. If the efficiency of motor is `40%` then the resistance of the winding of the motor is

A

`1.5Omega`

B

`3Omega`

C

`4.5Omega`

D

`6Omega`

Text Solution

Verified by Experts

The correct Answer is:
B
Input power `P=VI=50xx10`
power dissipated as heat `I^(2)R=100R`
`"Efficiency"=("output power")/("input power")`
`(40)/(100)=(500-100R)/(500)`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NARAYNA|Exercise NCERT Based Questions|13 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 5|42 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 2 H.W|45 Videos

  • COMMUNICATION SYSTEM

    NARAYNA|Exercise Level-II(H.W)|25 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NARAYNA|Exercise ASSERTION AND REASON|15 Videos

Similar Questions

Explore conceptually related problems

An electric motor operating on a 50 V dc supply draws a current of 12 A . If the efficiency of the motor is 30 % ,estimate the resistance of the windings of the motor.

An electric motor operating on a 50V d.e. supply draws a current of 12A. If the efficiency of the motor is 30\%, estimate the resistance of the windings of the motor.

An electric motor operating on a 60 V dc supply draws a currrent of 10A . If the effeciency of the motor is 50% , the resistance of its winding is

An electric motor runs a D.C. source of e.m.f. 200 V and draws a current of 10A . If the efficiency is 40% , then ressistance of the armature is:

An electric motor operates on a 110 V supply and draws a current of 10 A. If the motor yields a mechanical power of 330 watt, what is the efficiency of the motor ?

The efficiency of d.c. motor is given by eta =

An electric motor operates on a 50V supply and draws a current of 12A. If the motor yields a mechanical power of 150W. What is the percentage efficiency of the motor?

An electric motor operates on a 50V supply and draws a current of 12A. If the motor yields a mechanical power of 150W. What is the percentage efficiency of the motor?

An electric motor operating on a 30V supply draws a current of 10A and yields mechanical power of 120W. What is the efficiency of the motor? How much energy is lost as heat in 2h?

NARAYNA-CURRENT ELECTRICITY-Level 3
  1. Masses fo three are in the ratio 1:3:5 their lengths are in the ratio ...

    Text Solution

    |

  2. A heater coil rated at 1000 W s connected to a 110 V mains. How much t...

    Text Solution

    |

  3. In the following circuit, 5Omega resistor develops 45 J/s due to curre...

    Text Solution

    |

  4. Two wires 'A' and 'B' of the same material have their lengths in the r...

    Text Solution

    |

  5. An electric motor operating on 50 volt D.C. supply draws a current of ...

    Text Solution

    |

  6. Find the resistance of 240 V - 200 watt electric bulb when glowing. If...

    Text Solution

    |

  7. A wire of length L and 3 identical cells of negligible internal resist...

    Text Solution

    |

  8. Three bulbs with their power and working voltage are connected as show...

    Text Solution

    |

  9. A cell of emf 12 V and internal resistance 6Omega is connected in para...

    Text Solution

    |

  10. A cell develops the same power across two resistances R(1) and R(2) se...

    Text Solution

    |

  11. A metallic conductor at 10^(@)C connected in the left gap of meter bri...

    Text Solution

    |

  12. When a conducting wire is connected in the right gap and known resista...

    Text Solution

    |

  13. n identical resistors are taken (n)/(2) resistors are connected in ser...

    Text Solution

    |

  14. In a metere bridge, the balance length from left end (standard resista...

    Text Solution

    |

  15. In an experiment with a potentiometer to measure the internal resistan...

    Text Solution

    |

  16. A potentiometer wire of lengthh 100 cm has resistance 5Omega. It is co...

    Text Solution

    |

  17. 1 ohm resistance is in series with a Ammeter which is balanced by 75 c...

    Text Solution

    |

  18. A potentiometer wire of lengthh 100 cm has resistance 5Omega. It is co...

    Text Solution

    |

  19. In an experiment for calibration of voltmeter, standard cell of emf 1....

    Text Solution

    |

  20. In the circuit shown in fig. the potential difference between the poin...

    Text Solution

    |