ELECTRICAL OBJECTIVE QUESTIONS DAY-2
DC BASICS AND NETWORKS
1.The flow of electrical current in a conductor is due to flow of ?
a) electrons. b) protons.
c) electrons and ions. d) charged particles.
ANS: (a)
2) An electric current is the ?
a) random movement of electrons in a conductor
b) movement of free electrons predominately in one direction
c) pressure difference between two poles
d) the power that causes drift of electrons.
ANS: (b)
AC BASICS AND NETWORKS
3)The direction of current in an ac circuit ?
a) is from positive to negative.
b) is always in one direction.
c) varies from instant to instant.
d) cannot be determined.
ANS: (c)
4) When an electric current is passed through a bucket full of water, lot of bubbling in there–the electric current is ?
a) ac. b) dc.
c) pulsating. d) none
ANS: (b)
DC MACHINES
5) Which device illustrates the principle of electro-mechanical conversion ? (asked in B.T.E M.P 1996)
a) Amplifier. b)Battery charger.
c) Transformer. d) Electric bell.
ANS: (a)
6) Fleming’s left hand rule is applicable to ? (asked in B.T.E M.P 1992)
a) dc generator b) dc motor
c) alternator d) Transformer
ANS: (b)
AC MACHINES
7) In a transformer electrical power is transferred from one circuit to another with out change in ?
a) voltage b) current
c) frequency d) turns
ANS: (C)
8) The frequency of a voltage at the secondary is ? (A.M.I.E summer 1994)
a) greater than that of primary b) equal to that of primary
c) less than that of primary d) none
ANS: (b)
ELECTRONICS
9) An example of solid state device is ?
a) zener diode b) triode c) pentode
d) thyratron
ANS: (a)
10) Ratings on a capacitor are given 25μF , 12V. Also a plus sign is written near one of its terminals. The capacitor is ?
a) mica capacitor b) ceramic capacitor
c)electrolytic capacitor d) paper capacitor
ANS: (C)
POWER GENERATION
11) Which of the following power plants is the least reliable ?
a) wind b) tidal
c) geothermal d) solor
ANS: (a)
12) Which of the following power plants is the most reliable ?
a) diesel b) Hydro-electric
c) steam d) tidal
ANS: (b)
POWER SYSTEMS
13) Which of the following is usually not the generating voltage ?
a) 6.6 KV
b) 11 KV
c) 12.5 KV
d) 13.2 KV
ANS: (c)
14) The highest transmission voltage in india is ?
a) 750 KV b) 400 KV
c) 220 KV d) 132 KV
ANS: (b)
UTILIZATION OF ELECTRICAL ENERGY AND TRACTION
15 ) DC motors are still preferred for use in ?
a) electric excavators steel mills and cranes
b) lathes and machine tools
c) flour mills and jaw crushers
d) paper industry
ANS: (a)
16) The conversion of AC into DC can be affected by the use of ?
a) motor-generator set
b) mercury arc rectifier
c) silicon diodes
d) any of the above.
ANS: (d)
ELECTRICAL MEASUREMENTS
17) Zener diodes , when used as voltage standards ?
a) are forward biased b) are reverse biased
c) cover a wide range of current d) operate in breakdown strength
e) all of above except (a)
ANS : (e)
18 ) The material to be used in the manufacture of a standard resistor should be of ?
a) low resistivity
b) high resistivity and low temparature co-efficient
c) high temp co-efficient
d) low resistivity and high temparature co-efficient
ANS: (b)
CONTROL SYSTEMS
19) Basic elements of a closed loop control system are the ?
a) feedback and controlled system
b) controller and controlled system
c) controlled system and servo system
d) feed back element and controlled system and controller
ANS:(d)
20) A closed loop control system is basically different from open loop control system due to ?
a) feedback
b) servomechanism
c) actuating signal
d) error signal
ANS:(a)
Admin:- SAI SAIKUMAR JN (BELLAPURI SAIKUMAR)
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