The rate of rise of current through an inductive coil is maximum

at the start of the current flow

at 63.2% of its maximum steady value

near the final maximum value of current

Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it

increases their cost of manufacture

leads to their increased weight

When both the inductance and resistance of a coil are doubled the value of

time constant remains unchanged

initial rate of rise of current is doubled

final steady current is doubled

Hard steel is suitable for making permanent magnets because

its hysteresis loop has large area

its mechanical strength is high

In a magnetic material hysteresis loss takes place primarily due to

rapid reversals of its magnetisation

flux density lagging behind magnetising force

Magnetic Circuit 1(TTA)

22 Questions | By Harish.hot04 | Updated: Mar 20, 2022 | Attempts: 928

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. INSTRUCTIONS
1. NUMBER OF QUESTIONS 22
2. HAS A TIME LIMIT OF 20 MINUTES
3. HAS A PASS MARKS OF 30%
4. QUESTIONS PER PAGE 1
5. EACH QUESTIONS HAS 1 MARKS
6. NEGATIVE MARKING FOR EACH QUESTIONS 0.25
7. WILL ALLOW TO YOU GO BACK ,SKIP AND CHANGE YOUR ANSWERS
8. WILL ALLOW TO YOU PRINT OUT YOUR RESULT AND CERTIFICATE
9. WILL ALLOW TO YOU PRINT OUT YOURS RESPONSE SHEET WITH CORRECT ANSWER KEY AND EXPLANATION
10. WE WILL PROVIDE YOURS RESULT,CERTIFICATE AND YOUR RESPONSE SHEET TO YOURS EMAIL ID AT END OF ONLINE TEST

Questions and Answers

1.

The unit of reluctance is
- A.
  
  Meter/Henry
- B.
  
  Henry/Meter
- C.
  
  Henry
- D.
  
  1/Henry
Correct Answer
C. Henry
2.

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
Correct Answer
B. High, high
3.

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
Correct Answer
B. Current
4.

The rate of rise of current through an inductive coil is maximum
- A.
  
  At 63.2% of its maximum steady value
- B.
  
  At the start of the current flow
- C.
  
  After one time constant
- D.
  
  Near the final maximum value of current
Correct Answer
B. At the start of the current flow
5.

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be
- A.
  
  Zero
- B.
  
  Small
- C.
  
  Large
- D.
  
  None of the above
Correct Answer
C. Large
6.

The unit of retentivity is
- A.
  
  Weber
- B.
  
  Weber/sq. m
- C.
  
  Ampere turn/metre
- D.
  
  Ampere turn
Correct Answer
B. Weber/sq. m
7.

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
Correct Answer
C. Low hysteresis loss
8.

Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it
- A.
  
  Lowers their power efficiency
- B.
  
  Increases their cost of manufacture
- C.
  
  Leads to their increased weight
- D.
  
  Produces fringing
Correct Answer
A. Lowers their power efficiency
9.

Permeability in a magnetic circuit corresponds to______ in an electric circuit.
- A.
  
  Resistance
- B.
  
  Resistivity
- C.
  
  Conductivity
- D.
  
  Conductance
Correct Answer
C. Conductivity
10.

A material for good magnetic memory should have
- A.
  
  Low hysteresis loss
- B.
  
  High permeability
- C.
  
  Low retentivity
- D.
  
  High retentivity
Correct Answer
D. High retentivity
11.

.Permanent magnets are normally made of
- A.
  
  Alnico alloys
- B.
  
  Aluminium
- C.
  
  Cast iron
- D.
  
  Wrought iron
Correct Answer
A. Alnico alloys
12.

Relative permeability of vacuum is
- A.
  
  1
- B.
  
  1 H/m
- C.
  
  1/4JI
- D.
  
  4n x 10-' H/m
Correct Answer
A. 1
13.

When both the inductance and resistance of a coil are doubled the value of
- A.
  
  Time constant remains unchanged
- B.
  
  Initial rate of rise of current is doubled
- C.
  
  Final steady current is doubled
- D.
  
  Time constant is halved
Correct Answer
A. Time constant remains unchanged
14.

.A ferrite core has less eddy current loss than an iron core because
- A.
  
  Ferrites have high resistance
- B.
  
  Ferrites are magnetic
- C.
  
  Ferrites have low permeability
- D.
  
  Ferrites have high hysteresis
Correct Answer
D. Ferrites have high hysteresis
15.

Conductance is analogous to
- A.
  
  Permeance
- B.
  
  Reluctance
- C.
  
  Flux
- D.
  
  Inductance
Correct Answer
A. Permeance
16.

Hard steel is suitable for making permanent magnets because
- A.
  
  It has good residual magnetism
- B.
  
  Its hysteresis loop has large area
- C.
  
  Its mechanical strength is high
- D.
  
  Its mechanical strength is low
Correct Answer
A. It has good residual magnetism
17.

Conductivity is analogous to
- A.
  
  Retentivity
- B.
  
  Resistivity
- C.
  
  Permeability
- D.
  
  Inductance
Correct Answer
C. Permeability
18.

The property of a material which opposes the creation of magnetic flux in it is known as
- A.
  
  Reluctivity
- B.
  
  Magnetomotive force
- C.
  
  Permeance
- D.
  
  Reluctance
Correct Answer
D. Reluctance
19.

In a magnetic material hysteresis loss takes place primarily due to
- A.
  
  Rapid reversals of its magnetisation
- B.
  
  Flux density lagging behind magnetising force
- C.
  
  Molecular friction
- D.
  
  It high retentivity
Correct Answer
D. It high retentivity
20.

The unit of magnetic flux is
- A.
  
  Henry
- B.
  
  Weber
- C.
  
  Ampereturn/weber
- D.
  
  Ampere/metre
Correct Answer
B. Weber
21.

Laminated cores, in electrical machines, are used to reduce
- A.
  
  Copper loss
- B.
  
  Eddy current loss
- C.
  
  Hysteresis loss
- D.
  
  All of the above
Correct Answer
B. Eddy current loss
22.

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
Correct Answer
C. High,low

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

Current Version
Mar 20, 2022

Quiz Edited by
ProProfs Editorial Team
Jul 23, 2016

Quiz Created by
Harish.hot04

Magnetic Circuit 1(TTA)

The unit of reluctance is

Those materials are well suited for making permanent magnets which haveretentivity and _coercivity.

While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?

The rate of rise of current through an inductive coil is maximum

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

The unit of retentivity is

Silicon steel is used in electrical machines because it has

Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it

Permeability in a magnetic circuit corresponds to______ in an electric circuit.

A material for good magnetic memory should have

.Permanent magnets are normally made of

Relative permeability of vacuum is

When both the inductance and resistance of a coil are doubled the value of

.A ferrite core has less eddy current loss than an iron core because

Conductance is analogous to

Hard steel is suitable for making permanent magnets because

Conductivity is analogous to

The property of a material which opposes the creation of magnetic flux in it is known as

In a magnetic material hysteresis loss takes place primarily due to

The unit of magnetic flux is

Laminated cores, in electrical machines, are used to reduce

Those magnetic materials are best suited for making armature and transformer cores which havepermeability and___hystersis loss.

Magnetic Circuit 1(TTA)

The unit of reluctance is

Those materials are well suited for making permanent magnets which have______retentivity and _______coercivity.

While comparing magnetic and electric circuits, the flux of magnetic circuit is compared with which parameter of electrical circuit ?

The rate of rise of current through an inductive coil is maximum

If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be

The unit of retentivity is

Silicon steel is used in electrical machines because it has

Point out the wrong statement. Magnetic leakage is undesirable in electric machines because it

Permeability in a magnetic circuit corresponds to______ in an electric circuit.

A material for good magnetic memory should have

.Permanent magnets are normally made of

Relative permeability of vacuum is

When both the inductance and resistance of a coil are doubled the value of

.A ferrite core has less eddy current loss than an iron core because

Conductance is analogous to

Hard steel is suitable for making permanent magnets because

Conductivity is analogous to

The property of a material which opposes the creation of magnetic flux in it is known as

In a magnetic material hysteresis loss takes place primarily due to

The unit of magnetic flux is

Laminated cores, in electrical machines, are used to reduce

Those magnetic materials are best suited for making armature and transformer cores which have____permeability and_______hystersis loss.

Those materials are well suited for making permanent magnets which haveretentivity and _coercivity.

Those magnetic materials are best suited for making armature and transformer cores which havepermeability and___hystersis loss.