The back emf of a motor which is just started is_________?

Related Mcqs:

1. What is the self-inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1 ?

   A. 0.5 mH B. 0.5H C. 2.0H D. 8.0H...

2. An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?

   A. zero B. 5 H C. 5000 H D. 5 mH Submitted by: Tauseef Ali...

3. The most fundamental of all sciences which provides basic principles and fundamental laws to other branches of science is_________?

   A. biology B. physics C. information technology D. chemistry...

4. Atom is the smallest particall which is_________?

   A. Indivisible  B. Divisible C. Both D. Non of these Submitted by: Kamran khan...

5. Gravitation force of moon is_________?

   A. 7.2 m/s² B. 1.62 m/s² C. 9.8 m/s² D. 3.75 m/s² Submitted by: Adeeba Bashir...

6. A cube of side 5 cm has a charge of 6 C. The surface density of charge is_________?

   A. 100 C m–2 B. 200 C m–2 C. 300 C m–2 D. 400 C m–2 Submitted by: Tauseef Ali...

7. The first overtone of a stretched string of given length is 320 Hz. The first harmonic is_________?

   A. 320 Hz B. 640 Hz C. 160 Hz D. 480 Hz Submitted by: Tauseef Ali...

8. CGS unit of Force is_________?

   A. Newton B. Erg C. Dyne D. Joule Submitted by: Kashif Raza Tunio...

9. The shaft of a motor rotates at a constant angular speed of 360rev/min. Angle turned through in 1 sec in radian is________________?

   A. π B. 3π C. 6π D. 12π...

10. What is wavelength of visible spectrum?

    A. 8500 – 9800 angstrom B. 7800 – 8000 angstrom C. 3900 – 7600 angstrom D. 1300 – 3000 angstrom Submitted by: Engr Allah Wadhayo...