- A. both D.C. and A.C.
- B. D.C. only
- C. A.C. only
- D. any of the above
Electrical Machine Design
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An induction wattmeter can be used for_____.
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Alternating current is measured by_____.
- A. induction ammeter
- B. permanent magnet type ammeter
- C. electrostatic ammeter
- D. moving iron repulsion type voltmeter
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In a D.C. machine, the value of peripheral speed should not, normally, exceed_____.
- A. 10 m/s
- B. 20 m/s
- C. 30 m/s
- D. 40 m/s
-
Operating torques in analogue instruments are_____.
- A. deflecting and control
- B. deflecting and damping
- C. deflecting, control and damping
- D. vibration and balancing
-
In a Schering bridge the potential of the detector above earth potential is_____.
- A. a few volts only
- B. 1 kV
- C. 5 kV
- D. 10 kV
-
In a dynamometer 3-phase power factor meter, the planes of the two moving coils are at_____.
- A. 0°
- B. 60°
- C. 90°
- D. 120°
-
A moving iron instrument can be used for_____.
- A. D.C. only
- B. A.C. only
- C. both D.C. and A.C.
- D. neither D.C. and A.C.
-
In a Weston synchronoscope, the fixed coils are connected across_____.
- A. bus-bars
- B. incoming alternator
- C. a lamp
- D. none of the above
-
Commercial available medium size machines have a speed range of_____.
- A. 200 to 400 r.p.m.
- B. 600 to 1000 r.p.m.
- C. 1000 to 1500 r.p.m.
- D. 2000 to 2500 r.p.m.
-
A direct current can be measured by_____.
- A. a D.C. potentiometer directly
- B. a D.C. potentiometer in conjunction with a standard resistance
- C. a D.C. potentiometer in conjunction with a volt ratio box
- D. none of the above