Q.
The ratio of voltage and electric current in a closed circuit
a) remains constant
b) varies
c) increases
d) falls
Ans: remains constant
Q. The resistance of a wire varies inversely as
a) area of cross section
b) length
c) resistivity
d) temperature
Ans: area of cross section
Q. The electrical conductivity of metals is typically of the order of ( in ohm-1 m-1)
a) 10 to the power of 7
b) 10 to the power of 5
c) 10 to the power of -4
d) 10 to the power of -6
Ans: 10 to the power of 5*
Q. Four resistors, each of resistance R ohms are available. The minimum
resistance of the combination will be
a) 4R
b) R
c) R/4
d) R/8
Ans: R/4
Q. The elements which are not capable of delivering energy by its own are known
as
a) unilateral elements
b) non-linear elements
c) passive elements
d) active elements
Ans: passive elements
Q. The magnetic susceptibility of paramagnetic material is
a) less than zero
b) less than one but positive
c) greater than one
d) equal to zero
Ans:
Q. 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: varies from instant to instan
Q. which of the following statements associated with purely resistive circuits is
correct?
a) PF is unity
b) Power consumed is zero
c) Heat produced is zero
d) PF is zero
Ans: PF is unity
Q. The magnetic field energy in an inductor changes from maximum value to
minimum value in in 5m sec when connected to an ac source. The frequency of the
source is
a) 20 Hz
b) 50 Hz
c) 200 Hz
d) 500 Hz
Ans: 50 Hz
Q. Electronic control systems have the serious draw-backs of
a) low reliability
b) operational difficulty
c) temperature sensitiveness
d) all of above
Ans: temperature sensitiveness*
Q. The system whose characteristic equation has the following roots is marginally
stable
a) -j, j, -1,1
b) -3,-2,0
c) -2+3j, -2-3j, -2
d) -3,-2,-1
Ans:
Q. A phase log compensation will
a) improve relative stability
b) increase the speed of response
c) increase band-width
d) increase overshoot
Ans: improve relative stability*
Q. For Nyquist plot we use
a) open loop function
b) closed loop function
c) characteristic equation
d) any of the above
Ans: any of the above
Q. A system with gain margin close to unity or a phase margin close to zero is
a) highly stable
b) oscillatory
c) relatively stable
d) none of these
Ans: oscillatory
Q. Root locus diagram exhibits the
a) frequency response of a system
b) poles of the transfer function for a set of parameter values
c) bandwidth of system
d) all of the above
Ans: poles of the transfer function for a set of parameter values
Q. Increase in the gain K makes the system
a) more stable
b) unstable
c) marginally stable
d) none of above
Ans: unstable
Q. The transfer function of a system is used to determine
a) the output for a given input
b) the type of system
c) the input for a given output
d) the steady state gain
Ans:
Q. In a servo system the voltage induced in the control transformer rotor is the
a) error voltage
b) driving voltage
c) opposing voltage
d) none of these
Ans: error voltage
Q. With the feedback system, the transient response
a) decays slowly
b) decays rapidly
c) rises slowly
d) rises quickly
Ans: decays rapidly
Q. Which of the following types of instrument is an integrating instrument?
a) power factor meter
b) energy meter
c) watt meter
d) frequent meter
Ans: energy meter
Q. Which material is used for make the ’swamping’ resistance that is connected in
series with the working coil of a voltmeter?
a) Constanta
b) Manganin
c) Eureka
d) Nichrome
Ans: Manganin
Q. What are used to increase the range of ammeters.
a) Multipliers
b) Shunts
c) Control Springs
d) Potential transformers
Ans: Shunts
Q. Which voltmeter do you select for measuring 50KV DC?
a) Moving Coil Voltmeter
b) Hot wire voltmeter
c) Electro Dynamo meter
d) Electrostatic Voltmeter
Ans: Hot wire voltmeter*
Q. Which of the following you will prefer to extend the range of an ac voltmeter?
a) Low series resistance
b) high resistance in parallel
c) CT
d) PT
Ans: PT
Q. High AC voltages are usually measured with
a) magnetic voltmeter
b) inductive voltmeter
c) potential transformers with voltmeters
d) current transformers and voltmeters
Ans: potential transformers with voltmeters
Q. Creeping is the phenomena occurs in
a) voltmeter
b) watt meter
c) energy meter
d) ammeter
Ans: energy meter
Q. If the Supply voltage is increased by n times, the cross section of feeder will
decrease by ________ times ?
a) n
b) 1/n
c) n sqr
d) 1/n sqr
Ans: n
Q. The Frequency is measured by _________ bridge ?
a) Wheatstone bridge
b) hays bridge
c) Owens bridge
d) weins bridge
Ans: wiens bridge
Q. The Source internal Resistance Rs , When equal to Load resistance RL, the
maximum transferred is of _____ % of input power?
a) 100
b) 75
c) 50
d) 40
Ans: 50
