ISTRAC Technician Electronics Mechanic Paper 2019

ISTRAC Technician Electronics Mechanic Paper 2019
Date of Exam – 19th Nov 2019

A sine wave of frequency is having of 2000 Mz, its time period is _______
(a) 500 Micro sec
(b) 2000 Micro sec
(c) 25 Micro sec
(d) 1 Micro sec

If the current in the DC circuit is 1 Amp and voltage is 20 volts, the Power consumed the circuits is ______
(a) 20 watts
(b) 40 watts
(c) 400 watts
(d) 2 watts

The SI unit of resistivity is
(a) Ohm meter
(b) Meter/ ohm
(c) Ohm/ meter
(d) Ohm per square meter

The Root Mean Square (RMS) 200 Amps of the alternating current is given by ______
(a) 141.4 Amps
(b) 161.4 Amps
(c) 121.4 Amps
(d) 181.4 Amps

The flow of current in solids is due to
(a) Electrons
(b) Electrons and ions
(c) Atoms
(d) Nucleus

The main characteristics of insulating material is
(a) More current conductivity
(b) Low mechanical strength
(c) High dielectric strength
(d) Low melting point

The proportion of tin and lead used in electrician’s solder are ______
(a) Tin 60%; lead 40%
(b) Tin 50%; lead 50%
(c) Tin 40%; lead 60%
(d) Tin 35%; lead 65%

Which method of soldering iron is used for soldering miniature components on Printed Circuit Boards (PCB)
(a) Soldering with the soldering gun
(b) Soldering with torch
(c) Temperature controlled soldering iron
(d) Dip soldering

Pin insulators are not used for voltages _____
(a) Below 33000 V
(b) Below 30000 V
(c) Above 33000 V
(d) Above 30000 V

The difference between upper cut-off frequency and lower cut-off frequency is known as ______
(a) Bandwidth
(b) Q-factor
(c) Selectivity
(d) None of these

Another name for parallel resonant circuit is ______
(a) Addition circuit
(b) Supportive circuit
(c) Tuned circuit
(d) None of these

The value of power factor in series resonant circuit is _____
(a) Unity
(b) Infinity
(c) Invariable
(d) None of these

The modern technique of soldering on PCB is
(a) Soldering – gun soldering
(b) Soldering with flame
(c) Dip soldering
(d) Soldering with melting pot and ladle