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This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 10
Q1 | Which of the following materials has the highest value of dielectric constant?
- glass
- vacuum
- ceramics
- oil
Q2 | Which of the following capacitors will have the least variation ?
- paper capacitor
- ceramic capacitor
- silver plated mica capacitor
- none of the above
Q3 | Which of the following statements is incorrect ?
- the leakage resistance of ceramic capacitors is generally high
- the stored energy in a capacitor decreases with reduction in value of capacitance
- the stored energy in a capacitor increases with applied voltage
- a wire cable has distributed capacitance between the conductors
Q4 | Which of the following capacitors has relatively shorter shelf life ?
- mica capacitor
- electrolytic capacitor
- ceramic capacitor
- paper capacitor
Q5 | In the case of a lossy capacitor, its series equivalent resistance value will be
- small
- very small
- large
- zero
Q6 | In a capacitive circuit
- a steady value of applied voltage causes discharge
- an increase in applied voltage makes a capacitor charge
- decrease in applied voltage makes a capacitor charge
- none of the above
Q7 | When a dielectric slab is introduced in a parallel plate capacitor, the potential differencebetween plates will
- remain uncharged
- decrease
- increase
- become zero
Q8 | Capacitance increases with
- increase in plate area and decrease in distance between the plates
- increase in plate area and distance between the plates
- decrease in plate area and value of applied voltage
- reduction in plate area and distance between the plates
Q9 | A capacitor consists of
- two insulators separated by a con¬ductor
- two conductors separated by an in¬sulator
- two insulators only
- two conductors only
Q10 | A paper capacitor is usually available in the form of
- tubes
- rolled foil
- disc
- meshed plates
Q11 | Air capacitors are generally available in the range
- 10 to 400 pf
- 1 to 20 pf
- 100 to 900 pf
- 20 to 100 pf
Q12 | The unit of capacitance is
- henry
- ohm
- farad
- farad/m
Q13 | A capacitor in a circuit became hot and ultimately exploded due to wrong con¬nections,which type of capacitor it could be ?
- paper capacitor
- ceramic capacitor
- electrolytic capacitor
- any-of the above
Q14 | Energy stored in the electric field of a capacitor C when charged from a D.C source ofvoltage V is equal to joules
- cv2
- c2v
- cv2
- cv
Q15 | Electric field intensity is a quantity
- scalar
- vector
- both (a) and (6)
- none of the above
Q16 | When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
- 2 joules
- 4 joules
- 6 joules
- 8 joules
Q17 | The capacitor preferred for high frequency circuits is
- air capacitor
- mica capacitor
- electrolytic capacitor
- none of the above
Q18 | The capacity of capacitor bank used in power factor correction is expressed in terms of
- kw
- kva
- kvar
- volts
Q19 | While testing a capacitor with ohm-metre, if the capacitor shows charging, but the finalresistance reading is appreciably less than normal, it can be concluded that the capacitor is
- short-circuited
- open circuited
- alright
- leaky
Q20 | If a 6 (iF capacitor is charged to 200 V, the charge in coulombs will be
- 800 uc
- 900 uc
- 1200 uc
- 1600 uc
Q21 | Which capacitor will be physically smaller for the same ratings ?
- ceramic capacitor
- paper capacitor
- both will be of equal size
- none of the above
Q22 | What is the value of capacitance that must be connected in parallel with 50 pFcondenser to make an equivalent capacitance of 150 pF ?
- 50 pf
- 100 pf
- 150 pf
- 200 pf
Q23 | A mica capacitor and a ceramic capacitor both have the same physical dimensions.Which will have more value of capacitance ?
- ceramic capacitor
- mica capacitor
- both will have identical value of capacitance
- it depends on applied voltage
Q24 | Which of the following material has least value of dielectric constant ?
- ceramics
- oil
- glass
- paper
Q25 | Which of the following capacitors will have the least value of breakdown voltage ?
- mica
- paper
- ceramic
- electrolytic