2) In a gravity controlled instrument, the deflecting torque corresponding to a deflection of 90° is 1.2×10–4 kgm. Find the controlling distance of 2 cm from the axis of moving system. [Ans. 0.6 x 10-2 kg]
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- Match the following A cathode Choose... electrodynamometer instrument Choose... In single phase energy meter, is placed at the edge of Aluminum disc, which controls the speed of the disc. O series magnet O brake magnet O shunt magnet O M type magnetWhat is the direction of the magnetic field ? Take the forward direction as the direction you face in Measurement Mode.3Q) Analyze the relationship between flux produced by the moving coil and torque in a PMMC instrument.
- 1.You would use a piezoelectric transducer to detect a. microwave RF signals b. magnetic fields c. ultrasonic waves d. torque produced by a motor 2. Which of the following devices would you use to control and display the compass direction toward which a dish antenna points? a.A fluxgate magnetometer b.The GPS c.A synchro d.A capacitive proximity sensorQ25) i) What are the factors that the induced voltage in three phase induction motor depends upon and Explain how the rotating magnetic field is produced in the three phase induction motor.The OCC is measured by increasing the fieldcurrent in steps from zero to some maximum value, and recording the corresponding values of armature emf. If now the current is decreased from maximum to zero, the emf values will be different; why?
- 4. Explain the relationship between back emf E, terminal voltage V and coil voltage drop IR in DC motor and generator respectively. i. Describe how the field strength affect the performance of DC motor and generator. ii. Explain how an external resister changes the DC motor and generator performance.PLEASE ANSWER IT ASAP FOR AN UPVOTE. THANK YOU. Round off your answer into four decimal places .Box your final answer .Use SI unit. A magnetic circuit consist of silicon having a cross section of 1.5 sq. m and 0.1 m length and an air gap of the same cross section and pf 0.02 m length. what is the field intensity at the air gap if 0.5 A current flows through the 5000-turns coil? Assume the permeability of silicon steel is 3000.Steady Magnetic Field 8.5.2)
- Determine the commutator pitches Yc, trace the winding around the commutator and show that the proper segment, ahead of or behind the first one, is reached for the following wave-wound armatures: a) 75 segments, four poles b) 93 segments, four poles c) 229 segments, six poles d) 227 segments, eight polesDC machine questionChoose the correct answer 1.A robot can use a back-pressure sensor to a.measure the intensity of visible light. b. regulate the torque produced by an electric drill. c. determine the orientation of magnetic lines of flux. d. regulate the output of an acoustic transducer. 2. When you apply AF voltage to the plates of an electrostatic transducer, the electric field between the plates fluctuates in intensity, causing a. a magnetic field that moves the coil, producing sound waves. b. the capacitance to vary, thereby generating a phase shift. c. forces that move the flexible plate, producing sound waves. d. the plates to charge and discharge, producing AF current. 3. Which of the following devices is a form of RF transducer? a. A small loop antenna b. A back-pressure sensor c. An elastomer d. An epipolar navigation sensor