Current VU Mid Term Papers June 2026

*Date | Day : 02-Feb-2026*
*Time : 9:50 am*
*Subject : PHY301*
*MCQs:*

1.Load line coordinates give the values of (ID and VD)
2.Using superposition theorem, for a circuit containing independent sources, any remaining voltage source is (made zero by replacing it with a short circuit)
3.The primary function of a filter is to (remove ripples from the rectified output)
4.The turn-on voltage of a Ge junction diode is nearly (0.3 V)
5.The peak inverse voltage (PIV) is the maximum reverse voltage that can be applied to a diode (without breakdown)
6.Without the DC source, a clipper acts like a (limiter / unbiased clipper)
7.The clipper level is primarily determined by (the biasing voltage and diode drop)
8.In Thevenin theorem, while calculating Thevenin’s resistance Rth (open circuit current source and short circuit voltage source)
9.For a circuit containing a dependent voltage source, if Thevenin’s voltage Vth is 10 V and Isc is 2 A, then Rth will be (5 Ω)
10.A semiconductor element in pure form is called (intrinsic semiconductor)
11.The barrier voltage for a silicon diode is approximately (0.7 V)
12.The reverse biased region of a PN junction is entered when (terminal voltage is negative)
13.When DC voltage is applied to a diode, the resistance that does not change is called (DC or static resistance)
14.Using small-signal model, for a diode that conducts at 2 mA with n = 2, the change in current due to a change of voltage by 10 mV will be (0.4 mA)
15.A transformer is used for (AC only)
16.The output of a half-wave rectifier is suitable only for (low-power applications)
17.The width of the depletion region junction (decreases with heavy doping)
18.The PIV of a half-wave rectifier is (Vm)
19.The leakage current of a semiconductor diode is caused by (heat energy)
20.The basic function of a bridge full-wave rectifier and a full-wave rectifier is the same (Yes)
21.Like any semiconductor device, the Zener diode is sensitive to (current and voltage ratings)
22.Voltage multipliers are usually used in low-current, high-voltage applications such as (CRT, X-ray, TV circuits)
23.The stage of a power supply that uses a Zener diode as a main component is (voltage regulator)
24.Avalanche breakdown is primarily dependent on the phenomenon of (collision)
25.The emitter of a transistor is generally doped the heaviest because (it must inject maximum charge carriers)
26.In a properly biased NPN transistor, most of the electrons from the emitter (reach the collector)
27.In the normal (active) mode of operation, the junctions of an NPN transistor are (base-emitter forward biased and base-collector reverse biased)

I Don’t remember other 3 and other were those in which a circuit is given and ask to solve it and choose correct option
(The data in brackets are the asnwers)
*Short Questions:*
31. What is the relationship between temperature and conductivity in a semiconductor? (3 Marks)
32. Write one advantage of a full-wave bridge rectifier over a center-tapped full-wave rectifier. (3 Marks)
33. When is a BJT said to be in saturation mode? (3 Marks)
*Long Questions:*
In long question they given circuits and asked for a value to solve if you practice questions from handout you will cover whole paper easily
*Paper Overview:*
Coverage from handout: approximately 75 / 100
Most MCQs were from:
Diodes, rectifiers, filters, and regulators (Lectures 29–42)
Fewer questions from:
Network theorems (Lectures 23–27)
BJTs (Lectures 43–45