Multiple Choice Questions in Electronics Engineering Part 9

Multiple Choice Questions in Electronics Engineering Part 9

30.  Which of the following is (are) the form(s) of servo systems?

A. electromechanical

B. hydraulic

C. pneumatic

D. all of the choices

31.  What is another name for a servo system?

A. closed-loop control system

B. digital control system

C. analog control system

D. open-loop control system

32.  The noise signal can cause _____ to the servo system and must be eliminated.

A. damage

B. error

C. malfunctions

D. roughness

33.  What is combined with the error signal in the proper ratio to obtain the desired servo operation with reduced overshooting and minimum time tag?

A. correction voltage

B. swamp voltage

C. feedback voltage

D. trigger voltage

34.  What are the major differences of the dc rate generator and the dc generator?

A. size

B. load

C. prime mover

D. both A and C

35.  What is the Barkhausen criteria for sustained oscillations?

A. Aβ = 1

B. Aβ = -1

C. Aβ = 0

D. β = 1/Aβ

36.  What is the cathode of a lead-acid cell?

A. sponge lead

B. lead peroxide

C. sulfuric acid and water

D. hydroxide

37.  What is a Miller integrator?

A. sweep generator

B. function generator

C. low distortion audio generator

D. RF generator

38.  What system provides instant response to an error signal but results in the load oscillating about the point of synchronization?

A. overdamped system

B. critically damped system

C. underdamped system

D. all of the choices

39.  What are the ways to prevent polarization?

A. vent the cell

B. use a material that will absorb hydrogen

C. add a material rich in oxygen

D. all of the choices

40.  What is the simplest form of damping?

A. overdamping

B. underdamping

C. error-rate damping

D. friction clutch damping

41.  What is the production of hydrogen gas caused by a portion of the charge current breaking down the water in the electrolyte?

A. charging

B. gassing

C. condensing

D. evaporating

42.  What is the most suitable oscillator circuit for generating 1 MHz?

A. Colpitt’s oscillator

B. Hartley oscillator

C. tuned collector oscillator

D. Wien bridge oscillator

43.  A circuit has a source voltage of 100 volts and two 50-ohm resistors connected in series. If the reference point for this circuit is placed between the two resistors, what would be the voltage at the reference point?

A. 10 V

B. 40 V

C. 30 V

D. 50 V

44.  What amplifiers are biased so that collector current is zero (cutoff) for a portion of one alternation of the input signal?

A. class AB

B. class A

C. class C

D. class B

45.  What amplifiers are biased so that the collector current is cut off during one-half of the input signal?

A. class A

B. class B

C. class C

D. class AB

46.  What serves as the cathode in a common type of dry cell?

A. carbon electrode

B. steel cover

C. zinc container

D. nickel terminal

47.  Which of the following types of resistors will overcome the disadvantage of a carbon resistor?

A. rheostat

B. molded composition

C. potentiometer

D. wirewound resistor

48.  To flush a hydrometer, which of the following liquids should be used?

A. sulfuric acid

B. salt water

C. fresh water

D. a solution of baking soda and water

49.  The space between and around charged bodies in which their influence is felt. This is also called electric field of force or an electrostatic field.

A. magnetic field

B. air gap

C. free space

D. dielectric field