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Electrical Machine Design(Electrical Engineering ) Questions and Answers
Home
Topic
Electrical Engineering
Electrical Machine Design
Question 1.
In a D.C. machine, the value of peripheral speed should not, normally, exceed
10 m/s
20 m/s
30 m/s
40 m/s
Explanation:-
Answer: Option C. ->
30 m/s
Question 2.
Volt box is a component to
extend voltage range
measure voltage
compare voltage in a box
none of the above
Explanation:-
Answer: Option A. ->
extend voltage range
Question 3.
A moving-coil permanent-magnet instrument can be used as _____ by using a low resistance shunt.
ammeter
voltmeter
flux-meter
ballistic galvanometer
Explanation:-
Answer: Option A. ->
ammeter
Question 4.
In an AC co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
out of phase by 90°
out of phase by 60°
out of phase by 30°
out of phase by 0°
Explanation:-
Answer: Option A. ->
out of phase by 90°
Question 5.
For measuring current at high frequency we should use
moving iron instrument
electrostatic instrument
thermocouple instrument
none of the above
Explanation:-
Answer: Option C. ->
thermocouple instrument
Question 6.
D.C. machines designed with a large value of air gap length have
worst, ventilation
poor ventilation
better ventilation
none of the above
Explanation:-
Answer: Option C. ->
better ventilation
Question 7.
In direct cooled system using hydrogen both stator and rotor conductors are made
solid
hollow
perforated
any ofthe above
Explanation:-
Answer: Option B. ->
hollow
Question 8.
On which of the following variables heat convected depends ?
Power density
Temperature difference between heated surface and coolant
Thermal resistivity, density, specific heat
Gravitational constant
All of the above
Explanation:-
Answer: Option E. ->
All of the above
Question 9.
By which of the following methods motor rating for variable load drives can be determined ?
Method of average losses
Equivalent current method
Equivalent torque method
Equivalent power method
All of the above
Explanation:-
Answer: Option E. ->
All of the above
Question 10.
_________ electromagnets generally function as holding magnets.
Tractive
Portative
Either of the above
None of the above
Explanation:-
Answer: Option B. ->
Portative
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