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MCQOPTIONS
This section includes 682 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 401. |
A capacitor consists of two |
| A. | ceramic plates and one mica disc |
| B. | insulators separated by a dielectric |
| C. | silver-coated insulators |
| D. | conductors separated by an insulator |
| Answer» E. | |
| 402. |
The time constant and R-C circuit may also be defined as the time during which the charging current falls to percent of its initial maximum value, |
| A. | 37 |
| B. | 42 |
| C. | 63 |
| D. | 73 |
| Answer» B. 42 | |
| 403. |
Permittivity is expressed in |
| A. | farad/sq-m |
| B. | farad/metre |
| C. | weber/metre |
| D. | weber/sq-m |
| Answer» C. weber/metre | |
| 404. |
In a cable capacitor, voltage gradient ismaximum at the surface of the |
| A. | earth |
| B. | conduction |
| C. | sheath |
| D. | insulator |
| Answer» C. sheath | |
| 405. |
The time constant of an R-C circuit is defined as the time during which capacitor charging voltage actually rises to percent of its value. |
| A. | 37, initial |
| B. | 63.2, initial |
| C. | 63.2, final |
| D. | 37, final |
| Answer» D. 37, final | |
| 406. |
is that property of a capacitor which delays any change of voltage across it. |
| A. | inductance |
| B. | capacitance |
| C. | potential gradient |
| D. | none of the above |
| Answer» C. potential gradient | |
| 407. |
A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is |
| A. | 0.2 s |
| B. | 0.4 s |
| C. | 0.6 s |
| D. | 0.8 s |
| Answer» E. | |
| 408. |
The property of a capacitor to store electricity is called its |
| A. | capacitance |
| B. | charge |
| C. | energy |
| D. | none of the above |
| Answer» B. charge | |
| 409. |
Dielectric strength with increasing thickness |
| A. | increases |
| B. | decreases |
| C. | remains unaltered |
| D. | none of the above |
| Answer» C. remains unaltered | |
| 410. |
The unit of dielectric strength is given by |
| A. | v/m |
| B. | v2/m |
| C. | m/v |
| D. | m/v2 |
| Answer» B. v2/m | |
| 411. |
Electric displacement is a           quantity. |
| A. | scalar |
| B. | vector |
| C. | both of the above |
| D. | none of the above |
| Answer» C. both of the above | |
| 412. |
Electric intensity at any point in an electric field is equal to the at that point. |
| A. | electric flux |
| B. | magnetic flux density |
| C. | potential gradient |
| D. | none of the above |
| Answer» D. none of the above | |
| 413. |
The value of E within the field due to a point charge can be found with the help of |
| A. | faraday\s laws |
| B. | kirchhoff s laws |
| C. | coulomb\s laws |
| D. | none of the above |
| Answer» D. none of the above | |
| 414. |
A unit tube of flux is known as tube |
| A. | newton |
| B. | faraday |
| C. | michale |
| D. | none of the above |
| Answer» C. michale | |
| 415. |
The phenomenon of an uncharged body getting charged merely by the nearness of a charged body is known as |
| A. | pholoelectric effect |
| B. | chemical effect |
| C. | magnetic effect |
| D. | induction |
| Answer» E. | |
| 416. |
The relative permittivity has the following units |
| A. | f/m |
| B. | m/f |
| C. | wb/m |
| D. | no units |
| Answer» D. no units | |
| 417. |
The total deficiency or excess of electrons in a body is known as |
| A. | current |
| B. | voltage |
| C. | potential gradient |
| D. | charge |
| Answer» E. | |
| 418. |
A single core cable used on 33000 V has conductor diameter 10 mm and the in¬ternal diameter of sheath 25 mm. The maximum electrostatic stress in the cable is |
| A. | 62 x 105 v/m |
| B. | 72 x 105 v/m |
| C. | 82 x 105 v/m |
| D. | 92 x 105 v/m |
| Answer» C. 82 x 105 v/m | |
| 419. |
A capacitor having capacitance of 5 uF is charged to a potential difference of 10,000 V. The energy stored in the capacitor is |
| A. | 50 joules |
| B. | 150 joules |
| C. | 200 joules |
| D. | 250 joules |
| Answer» E. | |
| 420. |
field is associated with the capacitor. |
| A. | electric |
| B. | magnetic |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» B. magnetic | |
| 421. |
The potential gradient across the material of low permittivity is than across the material of high permittivity. |
| A. | smaller |
| B. | greater |
| C. | both (a) and (b) |
| D. | none of the above |
| Answer» C. both (a) and (b) | |
| 422. |
capacitors are used in transistor circuits. |
| A. | ceramic |
| B. | paper |
| C. | air |
| D. | electrolytic |
| Answer» B. paper | |
| 423. |
capacitors are used for audio frequency and radio frequency coupling and tuning. |
| A. | air |
| B. | mica |
| C. | plastic film |
| D. | ceramic |
| Answer» C. plastic film | |
| 424. |
The inverse of capacitance is called |
| A. | reluctance |
| B. | conductance |
| C. | susceptance |
| D. | elastance |
| Answer» E. | |
| 425. |
When the dielectric is homogeneous,the potential gradient is |
| A. | uniform |
| B. | non-uniform |
| C. | zero |
| D. | any of the above |
| Answer» B. non-uniform | |
| 426. |
The dielectric constant (relative permittivity) of glass is given by |
| A. | 0.1 to 0.4 |
| B. | 0.5 to 1.0 |
| C. | 2.0 to 4.0 |
| D. | 5 to 100 |
| Answer» E. | |
| 427. |
The units of volume charge density are |
| A. | coulomb/metre |
| B. | coulomb/metre |
| C. | coulomb/metre |
| D. | coulomb/metre |
| Answer» D. coulomb/metre | |
| 428. |
For closer tolerances which of the following capacitors is usually preferred ? |
| A. | paper capacitor |
| B. | mica capacitor |
| C. | ceramic disc capacitor |
| D. | none of the above |
| Answer» C. ceramic disc capacitor | |
| 429. |
Which of the following capacitors can be used for temperature compensation ? |
| A. | air capacitor |
| B. | ceramic capacitor |
| C. | paper capacitor |
| D. | none of the above |
| Answer» C. paper capacitor | |
| 430. |
The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be |
| A. | 36 x 10fa |
| B. | 36 x 107 n |
| C. | 36 x 108 n |
| D. | 36 x 109 n |
| Answer» E. | |
| 431. |
Dielectric constant for mica is nearly |
| A. | 200 |
| B. | 100 |
| C. | 3 to 8 |
| D. | 1 to 2 |
| Answer» D. 1 to 2 | |
| 432. |
Which of the following capacitors is marked for polarity ? |
| A. | air |
| B. | paper |
| C. | mica |
| D. | electrolytic |
| Answer» E. | |
| 433. |
Which of the following capacitors will have the least value of breakdown voltage ? |
| A. | mica |
| B. | paper |
| C. | ceramic |
| D. | electrolytic |
| Answer» E. | |
| 434. |
Which of the following material has least value of dielectric constant ? |
| A. | ceramics |
| B. | oil |
| C. | glass |
| D. | paper |
| Answer» C. glass | |
| 435. |
The value of dielectric constant for vacuum is taken as |
| A. | zero |
| B. | 1 |
| C. | 4 |
| D. | 10 |
| Answer» C. 4 | |
| 436. |
A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ? |
| A. | ceramic capacitor |
| B. | mica capacitor |
| C. | both will have identical value of capacitance |
| D. | it depends on applied voltage |
| Answer» B. mica capacitor | |
| 437. |
What is the value of capacitance that must be connected in parallel with 50 pF condenser to make an equivalent capacitance of 150 pF ? |
| A. | 50 pf |
| B. | 100 pf |
| C. | 150 pf |
| D. | 200 pf |
| Answer» C. 150 pf | |
| 438. |
Which capacitor will be physically smaller for the same ratings ? |
| A. | ceramic capacitor |
| B. | paper capacitor |
| C. | both will be of equal size |
| D. | none of the above |
| Answer» B. paper capacitor | |
| 439. |
If a 6 (iF capacitor is charged to 200 V, the charge in coulombs will be |
| A. | 800 uc |
| B. | 900 uc |
| C. | 1200 uc |
| D. | 1600 uc |
| Answer» D. 1600 uc | |
| 440. |
While testing a capacitor with ohm-metre, if the capacitor shows charging, but the final resistance reading is appreciably less than normal, it can be concluded that the capacitor is |
| A. | short-circuited |
| B. | open circuited |
| C. | alright |
| D. | leaky |
| Answer» E. | |
| 441. |
The capacity of capacitor bank used in power factor correction is expressed in terms of |
| A. | kw |
| B. | kva |
| C. | kvar |
| D. | volts |
| Answer» D. volts | |
| 442. |
The capacitor preferred for high frequency circuits is |
| A. | air capacitor |
| B. | mica capacitor |
| C. | electrolytic capacitor |
| D. | none of the above |
| Answer» C. electrolytic capacitor | |
| 443. |
When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of |
| A. | 2 joules |
| B. | 4 joules |
| C. | 6 joules |
| D. | 8 joules |
| Answer» E. | |
| 444. |
Energy stored in the electric field of a capacitor C when charged from a D.C source of voltage V is equal to joules |
| A. | cv2 |
| B. | c2v |
| C. | cv2 |
| D. | cv |
| Answer» B. c2v | |
| 445. |
Electric field intensity is a quantity |
| A. | scalar |
| B. | vector |
| C. | both (a) and (6) |
| D. | none of the above |
| Answer» C. both (a) and (6) | |
| 446. |
The unit of capacitance is |
| A. | henry |
| B. | ohm |
| C. | farad |
| D. | farad/m |
| Answer» D. farad/m | |
| 447. |
Air capacitors are generally available in the range |
| A. | 10 to 400 pf |
| B. | 1 to 20 pf |
| C. | 100 to 900 pf |
| D. | 20 to 100 pf |
| Answer» B. 1 to 20 pf | |
| 448. |
A capacitor in a circuit became hot and ultimately exploded due to wrong con¬nections, which type of capacitor it could be ? |
| A. | paper capacitor |
| B. | ceramic capacitor |
| C. | electrolytic capacitor |
| D. | any-of the above |
| Answer» D. any-of the above | |
| 449. |
A paper capacitor is usually available in the form of |
| A. | tubes |
| B. | rolled foil |
| C. | disc |
| D. | meshed plates |
| Answer» C. disc | |
| 450. |
A capacitor consists of |
| A. | two insulators separated by a con¬ductor |
| B. | two conductors separated by an in¬sulator |
| C. | two insulators only |
| D. | two conductors only |
| Answer» C. two insulators only | |