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

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

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