What is the assembly in a cathode-ray tube which fires a stream of electrons at the screen is called

1. A tachometer is an instrument used to measure

 

(a) the prospective short-circuit current

(b) the linear speed of a vehicle

(c) rotational speed

(d) the force needed to drive home an earth spike

2.Most modern temperature-measuring systems rely on

(a) a low ambient temperature

(b) the thermocouple principle

(c) radiant heat from the subject

(d) a passive infra-red detector

3. A Schmitt-trigger circuit is used in an electronic frequency-measuring device to

(a) bring the measured frequency and the crystal output into phase

(b) convert the measured waveform to a square wave

(c) start the two signals at exactly the same instant

(d) act as an AND logic gate

4. The assembly in a cathode-ray tube which fires a stream of electrons at the screen is called the

(a) X plates (b) deflection assembly

(c) electron gun (d) cathode

find the cost of your paper

Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator

1. (a) Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator: (i) series-connected, (ii) shunt-connected and (iii) compound-connected.   (b) State one purpose for which….

what happens if the resistance in series with the shunt field of a DC motor is increased in value

1. Sparking at the trailing edges of the brushes in a DC machine is usually prevented by fitting   (a) copper gauze brushes (b) a compensating winding (c) a compound….

Calculate the synchronous speed of a 10-pole three-phase machine connected to a 50 Hz supply.

1. The generator characteristic shown in Figure 9.28 is for a   (a) shunt machine (b) series machine (c) differentially compounded machine (d) cumulatively compounded machine 2.The speed of a….