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Which of the following is the major consideration to evolve a good design ?

Which of the following is the major consideration to evolve a good design ?

  1. Cost
  2. Durability
  3. Compliance with performance criteria as laid down in specifications
  4. All of the above
discuss
impose limitation on design

impose limitation on design.

  1. Saturation
  2. Temperature rise
  3. Efficiency
  4. All above
discuss
The efficiency of a machine should be as ______ as possible to reduce the operatingcost

The efficiency of a machine should be as ______ as possible to reduce the operatingcost.

  1. high
  2. low
  3. either of the above
  4. none of the above
discuss
If an insulating material is operated beyond the maximum allowable temperature, itslife is

If an insulating material is operated beyond the maximum allowable temperature, itslife is

  1. drastically increased
  2. drastically reduced
  3. unaffected
  4. none of the above
discuss
The design of mechanical parts is particularly important in case of _____ speedmachines

The design of mechanical parts is particularly important in case of _____ speedmachines.

  1. low
  2. medium
  3. high
  4. any of the above
discuss
In induction motors, the length of air gap in kept as small as mechanically possible isorder to have

 In induction motors, the length of air gap in kept as small as mechanically possible isorder to have

  1. low power factor
  2. high power factor
  3. high over load capacity
  4. any of the above
discuss
In ______ machines, the size of the shaft is decided by the critical speed which dependson the deflection of the shaft

 In ______ machines, the size of the shaft is decided by the critical speed which dependson the deflection of the shaft.

  1. small
  2. medium
  3. large
  4. any of the above.
discuss
The length cf air gap to be provided in ______ is primarily determined by power factorconsideration

The length cf air gap to be provided in ______ is primarily determined by power factorconsideration.a

  1. d.c. series motor .
  2. d.c. shunt motor
  3. induction motor
  4. synchronous motor
discuss
Electrical machines having a power output upto about 750 W may becalled_______machines

Electrical machines having a power output upto about 750 W may becalled_______machines.

  1. small size
  2. medium size
  3. large size
  4. any of the above
discuss
Electrical machines having power outputs ranging from a few kW upto approximately250 kW may be classified as

Electrical machines having power outputs ranging from a few kW upto approximately250 kW may be classified as

  1. small size machines
  2. medium size machines
  3. large size machines
  4. any ofthe above
discuss
Commercial available medium size machines have a speed range of ______

Commercial available medium size machines have a speed range of ______ .

  1. 200 to 400 r.p.m.
  2. 600 to 1000 r.p.m.
  3. 1000 to 1500 r.p.m.
  4. 2000 to 2500 r.p.m.
discuss
The action of electromagnetic machines can be related to which ofthe following basicprinciples ?

The action of electromagnetic machines can be related to which ofthe following basicprinciples ?

  1. Induction
  2. Interaction
  3. Alignment
  4. All of the above
discuss
The change in flux linkages can be caused in which ofthe following ways ?

The change in flux linkages can be caused in which ofthe following ways ?

  1. The flux is constant with respect to time and is stationary and the coil moves throughnit
  2. The coil is stationary with respect to flux and the flux varies in magnitude with respect to time
  3. Both the changes mentioned above occure together, i.e., the coil moves through a time varying field
  4. All ofthe above
discuss
is universally used for windings of electrical machines because it is easily workablewithout any possibility of fracture

is universally used for windings of electrical machines because it is easily workablewithout any possibility of fracture.

  1. Silver
  2. Steel
  3. Aluminium
  4. Copper
discuss
Aluminium when adopted as a conductor material in ______ transformers, decreases theoverall cost of the transformer

Aluminium when adopted as a conductor material in ______ transformers, decreases theoverall cost of the transformer

  1. small size
  2. medium size
  3. large size
  4. any of the above size
discuss
Which ofthe following materials is used in the manufacture of resistance grids to beused in the starters of large motors ?

Which ofthe following materials is used in the manufacture of resistance grids to beused in the starters of large motors ?

  1. Copper
  2. Aluminium
  3. Steel
  4. Cast-iron
discuss
Materials exhibiting zero value of resistivity are known as ______

Materials exhibiting zero value of resistivity are known as ______ .

  1. conductors
  2. semiconductors
  3. insulators
  4. superconductors
discuss
________ has a lowrelative permeability and is used principally in field frames when costis of primary importance and extra weight is not objectionable

________ has a lowrelative permeability and is used principally in field frames when costis of primary importance and extra weight is not objectionable.

  1. Cast steel
  2. Aluminium
  3. Soft steel
  4. Cast iron
discuss
______is extensively used for those portions of magnetic circuit which carry steady fluxand need superior mechanical properties ?

______is extensively used for those portions of magnetic circuit which carry steady fluxand need superior mechanical properties ?

  1. Grey cast-iron
  2. Cast steel
  3. High carbon steel
  4. Stainless steel
discuss
Hot rolled sheets have ______ value of permeability

Hot rolled sheets have ______ value of permeability

  1. zero
  2. low
  3. high
  4. none ofthe above
discuss
total MCQs: 102

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