Electrical Online Test 2
Category –EE Online Test
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Attempt Free Electrical Online Test 2 Here. Read The Important Electrical MCQ From Below.
1) Here is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 micro Wb?
A. 14,400 At/Wb
B. 1,440 At/Wb
C. 9,000 At/Wb
D. 90,000 At/Wb
Ans-D. 90,000 At/Wb
2) A magnetic field is made up of flux lines.
A. True
B. False
Ans-A. True
3) Materials with a low retentivity do not retain a magnetic field very well.
A. True
B. False
Ans-A. True
4) The unit for reluctance is
A. Tesla
B. At/Wb
C. At/m
D. Wb
Ans-B. At/Wb
5) The induced voltage across a stationary conductor in a stationary magnetic field is
A. Zero
B. Reversed in polarity
C. Increased
D. Decreased
Ans-A. Zero
Electrical Online Test 2
6) Hysteresis is the number of lines of force per unit area in a magnetic field.
A. True
B. False
Ans-B. False
7) If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density
A. Increases
B. Decreases
C. Remains the same
D. Doubles
Ans-B. Decreases
8) The tesla is the unit of magnetic flux
A. True
B. False
Ans-B. False
Electrical Online Test 2
9) Ampere-turn is the unit of magnetomotive force (mmf).
A. True
B. False
Ans-A. True
10) Electromagnetic induction is the force that produces a magnetic field.
A. True
B. False
Ans-B. False
11) When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
A. Increases
B. Decreases
C. Remains constant
D. Reaches zero
Ans-A. Increases
Electrical Online Test 2
12) When the current through the coil of an electromagnet reverses, the
A. Direction of the magnetic field reverses
B. Direction of the magnetic field remains unchanged
C. Magnetic field expands
D. Magnetic field collapses
Ans-A. Direction of the magnetic field reverses
13) What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?
A. 2,400 At
B. 240 At
C. 24 At
D. 2.4 At
Ans-C. 24 At
14) Reluctance in a magnetic circuit is analogous to current in an electrical circuit.
A. True
B. False
Ans-B. False
15) The unit for permeability is
A. Wb/At × m
B. At/m
C. At/Wb
D. Wb
Ans-A. Wb/At × m
16) An electromagnetic field exists only when there is
A. An increasing current
B. Decreasing current
C. Voltage
D. Current
Ans-D. Current
17) The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is
A. 1,000 V
B. 2,000 V
C. 31.25 V
D. 3,125 V
Ans-B. 2,000 V
Electrical Online Test 2
18) Lenz’s law defines the polarity of the induced voltage.
A. True
B. False
Ans-A. True
19) If a conductor is moved back and forth at a constant rate in a constant magnetic field, the voltage in the conductor will reverse polarity.
A. True
B. False
Ans-A. True
20) The ability of a material to remain magnetized after removal of the magnetizing force is known as
A. Permeability
B. Reluctance
C. Hysteresis
D. Retentivity
Ans-D. Retentivity
21) For a given wirewound core, an increase in current through the coil
A. Reverses the flux lines
B. Decreases the flux density
C. Increases the flux density
D. Causes no change in flux density
Ans-C. Increases the flux density
Electrical Online Test 2
22) A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will
A. Increase
B. Decrease
C. Remain constant
D. Be excessive
Ans-B. Decrease
