Electrical machine design Archives

1. Most sensitive galvanometer is

elastic galvanometer

vibration galvanometer

Duddlb galvanometer

spot ballistic galvanometer

Detailed SolutionMost sensitive galvanometer is

2. In a low power factor wattmeter the pressure coil is connected

to the supply side of the current coil

to the load side of the current coil

in any of the two meters at connection

none of the above

Detailed SolutionIn a low power factor wattmeter the pressure coil is connected

3. An induction meter can handle current up to

10:00 AM

30 A

60 A

100 A

Detailed SolutionAn induction meter can handle current up to

4. Is universally used for windings of electrical machines because it is easily workable without any possibility of

fracture

Silver

Steel

Aluminium E. Copper

Detailed SolutionIs universally used for windings of electrical machines because it is easily workable without any possibility of

5. Which of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?

Copper

Aluminium

Steel

Cast-iron

Detailed SolutionWhich of the following materials is used in the manufacture of resistance grids to be used in the starters of largemotors ?

6. Instrument transformers are

potential transformers

current transformers

both (A) and (B)

power transformers

Detailed SolutionInstrument transformers are

7. In a D.C. machine, the value of peripheral speed should not, normally, exceed

10 m/s

20 m/s

machine, the value of peripheral speed should not, normally, exceed A. 10 m/s B. 20 m/s C. 30 m/s

40 m/s

Detailed SolutionIn a D.C. machine, the value of peripheral speed should not, normally, exceed

8. A moving-coil permanent-magnet instrument can be used as flux meter

by using a low resistance shunt

by using a high series resistance

by eliminating the control springs

by making control springs of large moment of inertia

Detailed SolutionA moving-coil permanent-magnet instrument can be used as flux meter

9. If an insulating material is operated beyond the maximum allowable temperature, its life is

drastically increased

drastically reduced

unaffected

none of the above

Detailed SolutionIf an insulating material is operated beyond the maximum allowable temperature, its life is

10. A multirangq instrument has

multiple shunt or series resistances inside the meter

multicoii arrangement

variable turns of coil

multi range meters inside the measurement system E. any of the above

Detailed SolutionA multirangq instrument has

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