PTS Pakistan Testing Service 2022 Past Paper with Answers

Practice the PTS Pakistan Testing Service 2022 past paper with 108 solved MCQs, answers and topic coverage.

108 solved MCQs across 2 approved papers

PST Wapda Junior Engineer (Electrical) Past Paper 22-05-2022PST Wapda Junior Engineer · 2022 PST Wapda Junior Engineer (Electronics) Past Paper 22-05-2022PST Wapda Junior Engineer · 2022

A temperature-sensitive device is called a ______.Answer: Thermistor Operation of a transistor requires ______.Answer: None of these A DC–AC conversion device is called a ______.Answer: Inverter When an atom loses or gains an electron, it becomes ______.Answer: Ionized A sudden increase in the total current into a parallel circuit may indicate an increase in source ______.Answer: Voltage Primary batteries, unlike secondary batteries, may be ______.Answer: Used once The process of adding impurities to semiconductors is called ______.Answer: Doping Which subatomic particle has no electric charge?Answer: Neutron The atomic number of an element is determined by the ______.Answer: Number of protons The minority carriers in P-type and N-type semiconductors are ______.Answer: Holes in N-type and electrons in P-type In full-wave rectification, the output DC voltage across the load is obtained from ______.Answer: Complete cycle of AC The complex number 4 + j3 lies in which quadrant?Answer: 1st Quadrant Electric current is ______.Answer: Coulomb / time Electrons in a P-type semiconductor are ______.Answer: Minority carriers Analog signals vary ______.Answer: In time continuously The emitter in a transistor is ______ doped.Answer: Heavily doped Which of the following is not a donor impurity in a semiconductor?Answer: Aluminum The type of bonding in a semiconductor is ______.Answer: Covalent To implement various logic circuits in electronics, the devices used are called ______.Answer: Logic gates The barrier potential of a silicon PN junction is approximately ______.Answer: 0.7 V A high-pass filter passes ______.Answer: High-frequency signals If the current in a circuit is 0 A, the circuit is likely to be ______.Answer: Open Holes are like ______.Answer: Positive charge Rectification is obtained by ______.Answer: Passing an AC signal through a diode A strong electric field across a PN junction causes breakdown due to ______.Answer: Avalanche breakdown An operational amplifier (Op-Amp) has ______.Answer: High gain One coulomb of charge passing through a conductor in one second is equal to ______.Answer: One ampere Current flow in a PN semiconductor is mainly due to ______.Answer: Majority carriers In a half-wave rectifier, the output is obtained across the load during ______.Answer: Positive or negative half-cycle The movement of holes from the P-type region toward the N-type region to fill electron vacancies is called ______.Answer: Diffusion