Sunday, 22 March 2020

PHY301-Circuit Theory Quiz MCQs Lecture 23-45 Finalterm Objective Questions | SUPERSTARWEBTECH


PHY301-Circuit Theory Quiz  MCQS #Objective #Questions #Finalterm

1. To which of the winding of transformer alternating voltage is applied
  • primary winding
  • secondary winding
2. A transformer will be out of phase when
  • output voltage is 0 degree out of phase with input voltage
  • output voltage is 180 degree out of phase with input voltage
  • output voltage is 360 degree out of phase with input voltage
  • output voltage is same as input voltage
3. For secondary turns of 10 and primary turns of 20, the turn ratio is
  • 20:20
  • 10:20
  • 10:10
  • 20:10
4. which relation is true for transformer primary and secondary power
  • V1V2=I1I2
  • V2I2=V1I1
  • V2I1=V1I2
  • I2I1=V2V1
5. For I-V curve of a diode, a changing current from 20 mA to 10mA and voltage from 0.72v to 0.78v, cause AC resistance of value
  • 8 ohms
  • 6ohms
  • 1.66 ohms
  • none
6. Thermal ionization in semiconductor results creating of
  • only free electrons
  • only holes
  • both free electrons and holes
  • nothing
7. When germanium crystal is doped with a phosphorus atom, it becomes
  • P-type semiconductor
  • N-type semiconductor
  • Insulator
  • photo-transistor
8. A transformer has turn ratio 5 and the secondary voltage is 10v, the primary voltage is
  • 25v
  • 2v
  • 0.5v
  •  100
9. Addition of impurities in semiconductor material to produce more current is called
  • intrinsic
  • dopping
  • bonding
  • excitation
10. For forward biased condition of P-N junction
  • +Ve polarity to N electrode and -Ve polarity to P electrode
  • +Ve polarity to both N and P electrode 
  • +Ve polarity to P electrode and -Ve polarity to N electrode
  • -Ve polarity to both N and P electrode