Element of Electrical Design (3160918) MCQs

MCQs of GENERAL DESIGN ASPECTS

Showing 11 to 20 out of 84 Questions
1 2 3 4 5 6
11.

The hysteresis loss is caused by

(a)

Structural non-homogeneity
(b)

Work required for the magnetizing the material
(c)

Potential work function
(d)

None of the these
Answer:

Option (b)

12.

According to Steinmetz hysteresis law, hysteresis loss in a material is proportional to

(a)

B
(b)

B1.2
(c)

B1.6
(d)

B2
Answer:

Option (c)

13.

Reciprocal of reluctance is

(a)

Susceptibility
(b)

Permeability
(c)

Permeance
(d)

Reluctivity
Answer:

Option (c)

14.

The unit of retentivity is

(a)

Ampere turn
(b)

Ampere turn/metre
(c)

Weber/m2
(d)

Weber
Answer:

Option (c)

15.

Silicon steel is used in electrical machines because it has

(a)

Low co-ercivity
(b)

Low retentivity
(c)

Low hysteresis loss
(d)

High co-ercivity
Answer:

Option (c)

16.

The B/H characteristics can be determined using _______

(a)

Ammeter
(b)

Fluxmeter
(c)

Voltmeter
(d)

Multimeter
Answer:

Option (b)

17.

The B/H curve can be used to determine?

(a)

Iron loss
(b)

Hysteresis loss
(c)

Voltage loss
(d)

Eddy current loss
Answer:

Option (b)

18.

B/H curve shows the relationship between?

(a)

Voltage and magnetic flux density
(b)

Current and magnetic flux density
(c)

Magnetic field strength and magnetic flux density
(d)

Magnetic field strength and magnetic flux
Answer:

Option (c)

19.

The B/H ratio is not constant for ________

(a)

Non-magnetic materials
(b)

Paramagnetic materials
(c)

Ferromagnetic materials
(d)

Diamagnetic materials
Answer:

Option (c)

20.

The B-H curve for __________ will be a straight line passing through the origin

(a)

silicon steel
(b)

hardened steel
(c)

soft iron
(d)

air
Answer:

Option (d)

Showing 11 to 20 out of 84 Questions
1 2 3 4 5 6