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This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Electrical Engineering knowledge and support exam preparation. Choose a topic below to get started.
1. |
Voltage applied across a ceramic dielectric produces an electrolytic field 100 times greater than air. What will be the value of dielectric constant ? |
A. | 50 |
B. | 100 |
C. | 150 |
D. | 200 |
Answer» C. 150 | |
2. |
"The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed". The above statement is associated with |
A. | Coulomb's square law |
B. | Gauss's law |
C. | Maxwell's first law |
D. | Maxwell's second law |
Answer» C. Maxwell's first law | |
3. |
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 | |
4. |
While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ? |
A. | E.m.f. |
B. | Current |
C. | Current density |
D. | Conductivity |
Answer» C. Current density | |
5. |
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be |
A. | M |
B. | M/2 |
C. | 2 M |
D. | M/4 |
Answer» C. 2 M | |
6. |
The self-inductance of the coil may be defined as equal to the e.m.f. induced in volts when the current in the circuit changes at the rate of unit weber turns. |
A. | Yes |
B. | No |
C. | none |
D. | none |
Answer» C. none | |
7. |
A conductor 2 metres long moves at right angles to a magnetic field of flux density 1 tesla with a velocity of 12.5 m/s. The induced e.m.f. in the conductor will be |
A. | 10 V |
B. | 15 V |
C. | 25V |
D. | 50V |
Answer» D. 50V | |
8. |
The polarity of the induced voltage can be determined by using the left-hand generator rule. |
A. | Yes |
B. | No |
C. | none |
D. | none |
Answer» B. No | |
9. |
Two infinite parallel plates 10 mm apart have maintained between them a potential difference of 100 V. The acceleration of an electron placed between them is |
A. | 0.56 x 1015 m/s2 |
B. | 1.5 x 1015 m/s2 |
C. | 1.6 x 1015 m/s2 |
D. | 1.76 x 1015 m/s2 |
Answer» E. | |
10. |
The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is_______Vs |
A. | 50 |
B. | 20 |
C. | 0.05 |
D. | 500 |
Answer» C. 0.05 | |
11. |
The core of a coil has a length of 200 mm. The inductance of coil is 6 mH. If the core length is doubled, all other quantities, remaining the same, the in ductance will be |
A. | 3 mH |
B. | 12 mH |
C. | 24mH |
D. | 48mH |
Answer» B. 12 mH | |
12. |
Those materials are well suited for making permanent magnets which have______retentivity and _______coercivity. |
A. | low, high |
B. | high, high |
C. | high, low |
D. | low, low |
Answer» C. high, low | |
13. |
Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss. |
A. | high, high |
B. | low, high |
C. | high, low |
D. | low, low |
Answer» D. low, low | |
14. |
"The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface". The above statement is associated with |
A. | Gauss's law |
B. | Kirchhoff s law |
C. | Faraday's law |
D. | Lenz's law |
Answer» B. Kirchhoff s law | |
15. |
As per Faraday's laws of electromagnetic induction, an e.m.f. is induced in a conductor whenever it |
A. | lies perpendicular to the magnetic flux |
B. | lies in a magnetic field |
C. | cuts magnetic flux |
D. | moves parallel to the direction of the magnetic field |
Answer» D. moves parallel to the direction of the magnetic field | |
16. |
When a conductor moves in the field, so that it makes an angle 8 with the lines of flux, the force F is given as : F = Bl sin2 0. |
A. | Yes |
B. | No |
C. | none |
D. | none |
Answer» C. none | |
17. |
The number of Faraday tubes of flux passing through a surface in an electric field is called |
A. | electric flux |
B. | electric flux density |
C. | magnetic flux density |
D. | electric charge density |
Answer» B. electric flux density | |
18. |
at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point. |
A. | Electric intensity |
B. | Magnetic flux density |
C. | Electric flux |
D. | None of the above |
Answer» B. Magnetic flux density | |
19. |
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 | |