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
