PST Wapda Junior Engineer 2022 Past Paper with Answers

Practice the PST Wapda Junior Engineer 2022 past paper with 108 solved MCQs, answers and topic coverage.

108 solved MCQs across 2 approved papers

In the active region of a BJT, the biasing of the junctions is ______.Answer: BE forward, CB reverse A neutral semiconductor has ______.Answer: Equal positive and negative charges An example of stored electrical potential energy is a ______.Answer: Battery A modulating signal generally has a ______ frequency compared with the carrier signal.Answer: Low frequency The working of a transistor as an amplifier is similar to a ______.Answer: Step-up transformer The velocity of an oscillating charge as it moves to and fro along a wire is always ______.Answer: Changing A question related to a Zener diode is ______.Answer: Breakdown Which of the following is not a property of semiconductors?Answer: They do not emit light Which of the following parameters best describes the movement of electrons inside a semiconductor?Answer: Mobility Which of the following parameter best describes the movement of electrons inside a semiconductor?Answer: Mobility FSK is used in ______Answer: Telegraphy Radio broadcasting uses ______.Answer: FM The rate of information that can be carried through a communication channel depends mainly on its ______.Answer: Bandwidth In radar, PRF stands for ______.Answer: Pulse Repetition Frequency Which of the following is not physically present in a semiconductor?Answer: Temperature Which of the following is an indirect method of generating FM?Answer: Armstrong modulator Which of the following is not true about a solar cell?Answer: It produces dark current In color TV, a varactor diode is used for ______.Answer: Tuning