Circuit Theory (PHY301)

1. Using exponential model for a diode that conducts at 1mA with n = 2, the change in current due to change of voltage by 5mv will be

   1. 0.4mA
   2. 0.8mA
   3. 3mA
   4. 0.11mA

2. In a P- type semiconductor material, the majority carriers are ________.

   1. Holes
   2. Electrons
   3. Ions
   4. Protons

3. In an N-type semiconductor material, the majority carrier are

   1. holes
   2. electron
   3. ions
   4. protons

4. Diode small signal resistance rd at bias current of 5mA for n = 1 will be

   1. 10 ohms
   2. 8 ohms
   3. 5 ohms
   4. 2.5 ohms

5. If 10w of power is applied to primary of an ideal transformer with a turn ratio of 5, the power delivered to the secondary load is

   1. 25w
   2. 50w
   3. 0.5
   4. 10w

6. The width of the depletion layer of a junction

   1. decreases with light doping
   2. increases with heavy doping
   3. under reverse bias
   4. is increased under reverse bias

7. Which transformer gives less voltage at secondary as compared to primary?

   1. islated transformer
   2. step up transformer
   3. step down transformer
   4. all transformer

8. Secondary voltage is greater in magnitude as compared to primary voltage in a ________.

   1. step down transformer
   2. step up transformer
   3. isolated transformer
   4. simple transformer

9. The primary and secondary winding of transformer are

   1. physically touched
   2. physically isolated
   3. touched with conductor
   4. largely separated

10. Analysing the farward biase region of junction diode , the value of constant voltage,VT is ________.

    1. 25.02V
    2. 10mV
    3. 25.02mV
    4. 5Mv

11. If turn ratio of a transformer is 5 and secondary current is 2A, the primary current is ________.

    1. 2.5A
    2. 10A
    3. 0.4A
    4. 7A

12. A transformer will be out of phase when ________.

    1. output voltage is 0 degree out of phase with input voltage
    2. output voltage is 180 degree out of phase with input voltage
    3. output voltage is 360 degree out of phase with input voltage
    4. output voltage is same as input voltage

13. There is no voltage drop across diode when forward biased, in case of

    1. ideal diode model
    2. practical diode model

14. For a P-N junction under forward bias

    1. more forward current flows
    2. no forward current flows
    3. more reverse current flows
    4. infinite reverse current flows

15. There is a ________ energy gap between valence and conduction band.

    1. forbidden
    2. permitted

16. If a silicon diode conducts at 2mA and whose n = 1, the slope of diode will be at

    1. 1/25 ohms
    2. 1/2 ohms
    3. 2/25 ohms
    4. 2 ohms

17. True or false, hole current is opposit of electron current?

    1. True
    2. False

18. When the turn ratio of a transformer is 10 and primary ac voltage is 6v, the secondary voltage is ________.

    1. 36v
    2. 6v
    3. 60v
    4. 0.6v

19. A transformer may consists of ________.

    1. one winding
    2. two windings
    3. two or more than two windings
    4. no winding

20. Addition of impuritirs in semiconductor material to produce more current is called

    1. intrinsic
    2. dopping
    3. bonding
    4. excitation

Select a course code for Objective Questions:

ACC311 ACC501 BIF101 BIF401 BIF501 BIO101 BIO201 BIO202 BIO203 BIO204 BIO301 BIO302 BIO303 BIO401 BIO503 BNK603 BT101 BT201 BT301 BT302 BT401 BT402 BT403 BT404 BT405 BT406 BT501 BT504 BT505 BT604 CHE201 CHE301 CS001 CS101 CS201 CS202 CS204 CS301 CS302 CS304 CS311 CS401 CS402 CS403 CS408 CS501 CS502 CS504 CS506 CS508 CS601 CS602 CS604 CS605 CS607 CS609 CS610 CS614 CS707 CS710 ECO401 ECO402 ECO403 ECO404 EDU302 EDU401 EDU402 EDU501 EDU601 ENG101 ENG201 ENG301 ENG501 FIN611 FIN624 FIN625 ISL201 IT430 MCM101 MCM301 MGMT623 MGT101 MGT211 MGT301 MGT401 MGT402 MGT501 MGT502 MGT503 MGT510 MGT601 MGT603 MKT501 MKT610 MKT630 MTH101 MTH202 MTH302 MTH501 MTH601 MTH634 PAK301 PHY101 PHY301 PSY101 PSY403 PSY502 PSY512 SOC101 SOC301 SOC401 STA301 STA630 STA641 ZOO102 ZOO401 ZOO501 ZOO502 ZOO503 ZOO504 ZOO505 ZOO506 ZOO510 ZOO630

Select a course code for Subjective Questions:

ACC311 CS001 CS101 CS201 CS301 CS607 CS701 CS702 CS703 CS704 CS707 CS708 CS710 CS711 CS718 CS721 CS724 ECO401 ECO403 ENG101 ENG301 MGT703 MTH501 STA301