BHARAT SANCHAR NIGAM LIMITED
BSNL Junior Telecom Officer
Electrical Engineering Exam Paper
Q.1.Two 100-W, 200-V lamps are connected in series across a 200-V supply. The total power consumed by each lamp will be _____ watts.
Q.2.Kirchhoff’s voltage law is not valid for a non-linear network.
- True
- False
- Can not determine
- Partially True
Q.3.The material used for fuse must have
- low melting point and low specific resistance
- high melting point and low specific resistance
- low melting point and high specific resistance
- none of these
Q.4.If a piece of metal wire is stretched, its resistance will increase.
- True
- False
- Can not determine
- Partially True
Q.5.The usual value of the surge impedance of a telephone line is ______ohm.
Q.6.In mesh analysis of a network,all the mesh currents must necessarily be either clock-wise or anticlock-wise.
- True
- False
- Partially False
- Partially True
Q.7.The purpose of introducing reactor in the ignition circuit of mercury are rectifier is to limit the
- voltage of the circuit
- rate of change of flux in the circuit
- current in the circuit
- rate of change of current in the circuit
Q.8.An uncharged capacitor is connected across a charged one.There will flow an impulsive current through the circuit.
- True
- False
- Partially False
- Partially True
Q.9.In the case of a lossy capacitor, series equivalent resistance value will be
- small
- large
- very small
- none of these
Q.10.Time constant of an R-C circuit increases if the value of resistance is
- decreased
- increased
- neither (a) nor (b)
- either (a) or (b)
Q.11.If R, L and C denote resistance, inductance and capacitance respectively, the quantity RC has the same dimensions as that of R/L.
- True
- False
- Partially False
- Partially True
Q.12.If R, L and C denote resistance, inductance and capacitance respectively, then the quantity CR2 has the dimensions, of L.
- True
- False
- Partially False
- Partially True
Q.13.Sparking between contacts can be reduced by inserting a
- capacitor in parallel with contacts
- resistance in the line
- capacitor in series with contacts
- none of these
Q.14.A battery will not cause any current to flow, when it is connected across a pure capacitor, in the steady state even if the capacitor value varies with time.
- True
- False
- Partially False
- Partially True
Q.15.Voltage stress is maximum in a cable at the surface of the
- insulator
- sheath
- conductor
- none of these
Q.16.When two capacitors C1 and C2 are connected in series, the effective capacitance is C1+C2
- True
- False
- Partially False
- Partially True
Q.17.Sparking occurs when a load is switched off because the circuit has high
- a resistance
- inductance
- capacitance
- none of these
Q.18.The flux linked with a coil of inductance l carrying a current i is ddt(Li).
- True
- False
- Partially False
- Partially True
Q.19.The coefficient of coupling between two air core coils depends on
- mutual inductance and self inductances of the two coils
- mutual inductance between two coils only
- self inductances of the two coils only
- none of these
Q.20.The location of lightning arrestor is
- away from the transformer
- near the transformer
- near the circuit breaker
- none of these
Q.21.A conductor of length 1 meter moves at rt. angles to a magnetic field of flux density 1 Wb/m2 with a velocity of 25 m/s. The induced e.m.f. in the conductor will be ----- volt.
Q.22.In electrical machines, laminated cores are used with a view to reducing
- eddy current loss
- hysteresis loss
-
Q.23.A battery
- always delivers power
- always absorbs power
- absorbs power when the internal resistance is non-zero but delivers power when the internal resistance is zero
- can absorb or deliver power depending upon the circuit to which it is connected
Q.24.When one wants to connect two batteries in parallel to draw larger current than what can be supplied by one battery, it suffices to ensure that their e.m.f.s. are equal.
- True
- False
- Partially True
- none of these
25.An ideal battery can supply infinite current
- True
- False
- Partially True
- none of these
Q.26.Decibel is a
- unit of voltage
- unit of power
- ratio of power
- none of these
Q.27.dBm is a
- ratio of power
- unit of power
- unit of voltage
- none of these
Q.28.Decibel is a unit of
- frequency
- impedance
- power ratio
- none of these
Q.29.The absolute unit of resistance is of the dimension of
- velocity
- length
- acceleration
- none of these
Q.30.The absolute unit of inductance is of the dimension of
- time
- length
- mass
- none of these
Q.31.The applied voltage from the circuit being checked is disconnected when an ohmmeter is used because
- the current will decrease the resistance
- the ohmmeter has its own battery
- no current is needed for meter movements
- none of these
Q.32.An accurate voltmeter must have an internal impedance of
- very high value
- very low value
- low value
- none of these
Q.33.A moving –coil instrument can be used to measure
- high frequency a.c.
- low frequency a.c
- both d.c. and a.c
- direct current
Q.34.The voltage drop across the moving coil of a 50-ยต A (f.s) PMMC meter at full- scale deflection is ---- the voltage drop across that of a 1-mA (fs) PMMC meter at full-scale deflection.
- less than
- approximately equal to
- greater than
- none of these
Q.35.Deflection of pointer of a permanent-magnet moving-coil meter for fixed current is _______ flux density in the airgap between magnetic pole shoes and coil.
- independent of
- directly proportional to
- inversely proportional to
- none of these
Q.36.A moving-iron meter is useful for voltage measurement at _______frequencies.
- high
- low
- very high
- none of these
Q.37.A thermocouple instruments would be used to measure alternating current only?
- low
- very low
- high
- none of these
Q.38.Which of the following instruments will be used to measure alternating current only?
- moving – iron (attraction-types) ammeter
- moving – iron voltmeter
- permanent-magnet type ammeter
- induction-type ammeter
Q.39.A milliammeter can be used
- only as an ammeter
- as a voltmeter
- both as voltmeter and ammeter
- none of these
Q.40.To measure the e.m.f. of a Weston standard cell, one would use a/an
- electrostatic voltmeter
- hot-wire voltmeter
- galvanometer
- potentiometer
Q.41.Deflection sensitivity of deflecting plates of cathode ray tube __the distance between deflection pates.
- is inversely proportional to
- is directly proportional to
- does not depend on
- none of these
Q.42.Deflection sensitivity of deflecting plates of a cathode ray tube ____the accelerating anode (A3) voltage.
- is inversely proportional to
- is directly proportional to
- does not depend on
- none of these
Q.43.A moving –coil instrument can be used to measure
- direct current
- alternating current
- both direct current and alternating current
- none of these
Q.44.The frequency stability of a crystal oscillator depends upon
- tuned circuit
- crystal
- crystal as well as the tuned circuit
- none of these
Q.45.Hay bridge is usually used for measuring
- resistance
- capacitance
- inductance
- none of these
Q.46.Schering bridge is used for measuring
- capacitance
- inductance
- frequency
- none of these
Q.47.The Wien’s bridge is particularly useful for measuring frequencies of _______value.
- low
- very high
- high
- very low
Q.48. mpedance relay is used to protect
- line within a particular zone
- line beyond a particular zone
- the whole transmission system
- none of these
Q..49.Buchholz relay is used in ______ protection.
- line
- generator
- transformer
- none of these
Q.50. 1 GHz means 1000 Hz.
- True
- False
- Partially True
- None of these
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