Wireless PSI / TO paper 2

Technical Mock Test

Transistors, Networking, RLC, and Communication Systems

1. In a P-N junction diode, the region containing uncombined acceptor and donor ions is called:

Transition region Depletion region Neutral region Active region Not Attempted

2. Which configuration of a BJT provides the highest voltage gain?

Common Emitter (CE) Common Base (CB) Common Collector (CC) Emitter Follower Not Attempted

3. The primary purpose of Transistor Biasing is to:

Increase the gain Reduce power consumption Stabilize the operating point (Q-point) Increase input impedance Not Attempted

4. How many flip-flops are required to build a Mod-16 counter?

2 3 4 16 Not Attempted

5. De Morgan's first theorem states that the complement of a sum is equal to the:

Product of the complements Sum of the complements Complement of the product Inverted sum Not Attempted

6. In a series RLC circuit at resonance, the impedance is:

Maximum Minimum (equal to R) Zero Infinite Not Attempted

7. A transmission line is said to be distortionless if:

LG = RC LR = GC LC = RG R = 0 Not Attempted

8. Which protocol is used to map an IP address to a MAC address?

DHCP DNS ARP HTTP Not Attempted

9. If the modulation index of an AM wave is 1 (100%), the power in the sidebands is:

100% of carrier power 50% of carrier power 25% of carrier power 33.3% of carrier power Not Attempted

10. In Phase Modulation (PM), the frequency deviation is proportional to:

Modulating signal frequency Carrier amplitude Carrier frequency Modulating signal period Not Attempted

11. What is the main advantage of SSB (Single Sideband) over standard AM?

Bandwidth and Power efficiency Simpler receiver design Better audio quality No frequency drift Not Attempted

12. In a Superheterodyne receiver, 'Image Frequency' rejection is the function of:

IF Amplifier Local Oscillator RF Stage Detector Not Attempted

13. Which of the following is used for SSB generation?

Reactance modulator Filter method Varactor diode Envelope detector Not Attempted

14. The 'Thermal Runaway' condition in a BJT occurs when:

Collector current increases due to temperature rise Base current is too high The heat sink is too large Vce is decreased Not Attempted

15. What is the Q-factor of a series RLC circuit?

R/L (1/R) * sqrt(L/C) sqrt(LC) R * sqrt(C/L) Not Attempted

16. The characteristic impedance of a loss-less transmission line is:

sqrt(LC) sqrt(L/C) 1/sqrt(LC) L/C Not Attempted

17. Which layer in OSI model provides End-to-End communication?

Network Layer Transport Layer Session Layer Physical Layer Not Attempted

18. The Carson's Rule for FM bandwidth is:

2 * Delta f 2 * (Delta f + fm) Delta f + fm 2 * fm Not Attempted

19. Pre-emphasis in FM broadcasting is used to improve:

SNR at higher frequencies Carrier stability Bandwidth efficiency Modulation index Not Attempted

20. The 2's complement of the binary number (101100) is:

010011 010100 110100 010010 Not Attempted

21. In an RLC parallel circuit, at resonance, the circuit acts as:

Purely resistive (Maximum Impedance) Purely inductive Purely capacitive Short circuit Not Attempted

22. The VSWR (Voltage Standing Wave Ratio) on a perfectly matched line is:

0 1 Infinity 0.5 Not Attempted

23. Which multiplexing technique is used in fiber optics?

FDM WDM (Wavelength Division) TDM CDM Not Attempted

24. A JFET is a ______ controlled device.

Voltage Current Power Resistance Not Attempted

25. In Digital Electronics, the 'Race Around' condition occurs in:

SR Flip Flop JK Flip Flop D Flip Flop Master-Slave FF Not Attempted

26. Which AM receiver component extracts the modulating signal from the carrier?

Mixer Detector IF Amplifier Power Amplifier Not Attempted

27. In BJT biasing, which circuit provides the best stability factor?

Fixed Bias Voltage Divider Bias Collector to Base Bias Emitter Bias Not Attempted

28. The 'Skin Effect' in transmission lines causes the current to flow:

At the center of the conductor Near the surface of the conductor Uniformly throughout In the insulation Not Attempted

29. The intermediate frequency (IF) for most AM broadcast receivers is:

455 kHz 10.7 MHz 1 MHz 100 kHz Not Attempted

30. Which of the following is a 'Loopback' IP address?

192.168.1.1 127.0.0.1 255.255.255.0 10.0.0.1 Not Attempted