Multiple Choice Questions in Electronics Engineering Part 10

Multiple Choice Questions in Electronics Engineering Part 10

30.  What is the main advantage of a series motor?

A. high torque (turning force) at low speed

B. low torque (turning force) at low speed

C. high torque (turning force) at high speed

D. low torque (turning force) at low speed

31.  What is the electrolyte of a lead-acid cell?

A. sulfuric acid

B. hydrochloric acid

C. sulfuric acid and water

D. hydroxide

32.  In what year did Leon Foucault coin the word gyroscope?

A. 1950

B. 1952

C. 1850

D. 1852

33.  What is a rotary, electromechanical device used to perform trigonometric computations by varying the magnetic couplings between its primary and secondary windings?

A. revolver

B. rotor

C. circulator

D. gyroscope

34.  What is the electrolyte of a nicad cell?

A. potassium hydroxide and water

B. hydrochloric acid and water

C. sulfuric and water

D. hydroxide and water

35.  What is the stationary member of a synchro that consists of a cylindrical structure of a slotted laminations on which three Y-connected coils are wound with their axes 120 apart?

A. revolver

B. rotor

C. stator

D. gyroscope

36.  What is the process of adjusting a synchro to its electrical zero position?

A. initializing

B. zeroing

C. setting

D. starting

37.  A synthetic mixture of rosins that is flexible and used as an insulating material. Generally used as an insulator for low- and medium-range voltages.

A. Teflon

B. PE

C. PVC

D. Thermoplastic

38.  A step-transmitter is a modification of what electrical device?

A. rotary switch

B. stepper rotor

C. mechanical switch

D. stepper transformer

39.  In the ac position servo system, the _____ and _____ of the ac error signal determine the amount and direction the load will be driven.

A. amplitude, polarity

B. polarity, phase

C. amplitude, phase

D. polarity, frequency

40.  What is(are) the general source(s) of mechanical drift?

A. unbalance

B. inertia of Gimbals

C. bearing friction

D. all of the choices

41.  What are the three types of nonmetallic insulating materials that can be used in a

high-temperature environments?

A. FEP

B. silicone rubber

C. extruded polytetrafluoroethylene

D. all of the choices

42.  In what directions will the compass needle point when the compass is placed in the magnetic field surrounding a wire?

A. the south pole of the compass will point in the direction of the magnetic lines of force

B. the north pole of the compass will point in the direction of the current

C. the south pole of the compass will point in the direction of the current

D. the north pole of the compass will point in the directions of the magnetic lines of force

43.  What are used when power form a conventional servo amplifier is too small to drive large servo motors (either ac or dc)?

A. power amplifiers

B. prime movers

C. magnetic amplifiers

D. additional servo amplifiers

44.  The amount of precession that results from a given force is determined by what quantity?

A. elasticity

B. rigidity

C. flexibility

D. viscousity

45.  The IC synchros or Interior Communication synchros are sometimes called as _____.

A. reverse synchros

B. forward synchros

C. flexible synchros

D. fixed synchros

46.  What factors determine the rigidity of a gyro?

A. rotor speed

B. shape

C. weight

D. all of the choices

47.  What is the capacity of the battery for a specific rate of discharge?

A. rating

B. cycling

C. discharging

D. battery life

48.  The motions of a gyroscope can be analyzed in accordance to what basic quantity(ies)?

A. spin

B. precession

C. torque

D. all of the choices

49.  How are servo systems classified?

A. according to their functions

B. according to their sizes

C. according to their weights

D. according to their load capacity