A motor's torque demand can be tested quickly by measuring the motor's _______ a. Current b. Voltage c. Resistance d. Inductance
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A motor's torque demand can be tested quickly by measuring the motor's _______
a. Current
b. Voltage
c. Resistance
d. Inductance
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- Q2/ A d.c. series motor is running whith a speed of 800 r.p.m. while taking a current of 20 A from the supply. If the load is changed such that the current deawn by the motor is increased to 50 A , calculate the speed of the motor on new load. The armature and series field winding resistances are 0.2 ohm and 0.3 ohm respectively . Assume the flux produced is proportional to the current. Assume supply voltage as 250 V.A 220 V series motor runs at 800 r.p.m., when taking a current of 15 A. The motor has R, = 0.3 Q and R = 0.2 0.Find the resistance to be connected in series with the armature if it has to take the same current at the same voltage at 600 r.m.p.Assume flux is proportional to the current.The armature of a d.c. machine has a resistance of 0.25 ohm and is connected to a 300V supply. Calculate the e.m.f. generated when it is running: (a) as a generator giving 100A, and (b) as a motor taking 80A.
- 10.a. Which one of the following leads on a dual-voltage motor serves as a motor terminal?A. T2B. T5C. T7D. T410.b. The total flux per pole of a reconnected motor is 900,000 lines of force. If the cross-sectional area ofthe laminated core is 6 sq in. and the cross-sectional area of the teeth per pole is 14 sq in., the flux densityin the teeth is approximatelyA. 120,000 lines.B. 101,000 lines.C. 105,000 lines.D. 98,300 lines.b) A newly built institution has bought a D.C. shunt generator to supply a library in order for students to study using electrical power from this machine when there is load shedding on the national grid. The total load of the library is 50 kW through the cables of total resistance of 0.04. The winding resistance of the generator is 5092 and the armature resistance is 0.072832. The library is to be supplied at 0.4kV. i. Draw the circuit diagram indicating all the above stated values. ii. Determine the load current (IL). iii.Determine the terminal voltage of the generator. iv. Determine the armature current. v.Determine the E.M.F. generated in the armature.Example : In a 110 V, d.c. compound generator, the resistance of the armature, shunt field and series field are 0.06 , 25 and 0.04 respectively. The load consists of 200 lamps each rated at 55 W, 110 V. Find the total e.m.f. generated and the armature current when the machine is connected in (a) long shun
- The dimensions of the circuit and the number of windings are indicated on the figure. a) Draw the equivalent circuit. b) Find the equivalent reluctance value of the magnetic circuit. c) Find the value of the total magneto-motor force produced by the coils wound on the magnetic core. d) Find the values of total magnetic flux and arm magnetic flux flowing through the magnetic circuit. e) Find the self-inductance value of each winding and the common inductance value between the windings.3.3 The current in a conductor on the armature of a dc motor is 300A. The flux under the poles is 850μWb. The area per pole is 700 mm2. The length of the conductor on the armature is 640mm. Calculate the force exerted on the conductor.A. The brushes used in a DC generator a) ride against the commutator segments. b) are made from material softer than the commutator segments. c) are generally marked Al and A2 d) all of the above B. A magneto is a DC generator that uses for its pole pieces. a) electromagnets b) permanent magnets c) either "a" or "b" d) neither "a" nor "b"
- DEGREE: ELECTRICAL ENGINEERING SUBJECT/COURSE: AC MACHINES Answer the following questions (A, B and C) depending on the topic. 1. ALTERNATORS A. Why is it necessary to maintain the speed of an alternator at all times and how do they control the speed of an alternator when in operation? B. Distinguish between half-coiled and full-coiled armature windings in alternators. C. Why are fractional pitch windings generally used in alternators?The two basic kinds of electricity are: Static and stationary. Current and resistance. a. b. Static and dynamic. d. Dynamic and moving. C. Electromotive force (EMF) causes electrons to flow through a circuit. EMF is measured in: Volts. b. Amperes. Current, Resistance a. C. d. A complete circuit is made up of A generator, electron flow. and voltage source. a. A source of electricity, a conductor, and a consuming device. b. A consuming device, a load, and a conductor. d. Electron flow, resistance, and a load. C. You can get an electrical shock: When some part of your body becomes part of an electric a. circuit. b. If you touch both wires of an electric circuit. C. If you touch one wire of an energized circuit and ground. d. All of the above. Electricity can cause fires: Because of defective or misused electrical equipment. When wires are improperly spliced or connected. When wires are improperly connected to outlets or a. b. C. switches. d. All of the above.8. An 8-pole lap-wound d.c. generator has 120 slots having 4 conductors per slot. If each conductor can carry 250 A and if flux/pole is 0.05 Wb, calculate the speed of the generator for giving 240 V on open circuit. If the voltage drops to 220 V on full load, find the rated output of the machine. Subject: Electrical Machine 1