## 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