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Rahul Singhmar
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- The winding where dummy coils are used is sometimes called
a. Duplex winding
b. Triplex winding
c. Forced winding
d. None
Answer is option c.
- Power transformers have rating
a. Equal to 50 kVA
b. Equal to 100kVA
c. Above 200 kVA
d. None.
Answer is option c.
- the stator of DC machine comprises
a. Main poles
b. Interpoles
c. Frame
d. All of these.
Answer is option d.
- in case of electrical machines the intermittent rating as compared to its continuous rating is
a. Same
b. Less
c. More
d. Any of above
Answer is option c.
- due to which of the following harmonic fields are produced?
a. Windings
b. Slotting
c. Saturation
d. Irregularities in the air gap
e. All of these
Answer is option e.
- the conductors for large size of DC machines......in cross section
a. Circular
b. Triangular
c . Trapezoidal
d. Rectangular
Answer is option d.
- polarisation is
a. Scalar quantity
b. Vector quantity
c. Both a and b
d. None
Answer is option b.
- flash point temperature of fresh dry oil is
a. 55 degree Celsius
b. 75 degree Celsius
c. 100 degree Celsius
d. 135 degree Celsius
Answer is option d.
- germanium possesses
a. Two valence electrons
b. 3 valence electrons
c. Four valence electrons
d. Five valence electrons
Answer is option c.
- thermistors find used in which of the following
a. In thermometer
b. In measurement of microwave power
c. As a thermal relay
d. in control devices activated by temperature change
e. All of these
Answer is option e.
- the coils of DC motor starter are wound with wire of
a. Copper
b. Kanthal
c. Manganin
d. Nichrome
Answer is option c.
- dielectrics have
a. A few free electrons
b. Many free electrons
c. No free electrons
d. None
Answer is option c.
- ........... Is the property of absorption moisture from atmosphere
a. Solubility
b. Viscosity
c. Porosity
d. Hygroscopicity
Answer is option d.
- The SI unit is
a. Kg-wt
b. Poundal
c. Newton
d. None
Answer is option c.
- Kinetics is the branch of
a. Dynamics
b. Statics
c. Chemistry
d. None
Answer is option a.
- The effect of moment on a body is
a. to move it.
b. to turn it
c. None
Answer is option b.
- Three phase energy is
a. Ampere hour meter
b. Watt hour meter
c. Wattmeter
d. None
Answer is option b.
- Joints used in joining overhead lines conductors are
a. Britannia joint
b. Married joint
c. Tee joint
d. All
Answer is option a.
- For 11 kv lines the length of the cross Cross arm is usually
a. 50 cm
b. 100 cm
c. 150 cm
d. 200 cm
Answer is option c.
- Pin type insulators are used
a. Upto 11 kv
b. Upto 33 kv
c. Above 33 kv
d. All
Answer is option b.
- Which of the following gas is used to extinguish fire 🔥
a. Oxygen
b. CO
c. Hydrogen
d. Carbon dioxide
Answer is option d.
- A good instrument for testing ground resistance is
a. Ohmmeter
b. Meggar
c. Earth tester
d. All
Answer is option c.
- Main factors responsible for selection of battery
a. Voltage
b. Capacity
c. Nature of work
d. All
Answer is option b.
- Breaking capacity of a circuit breaker is usually expressed in terms of
a. Amperes
b. Volts
c. MW
d. MVA
Answer is option d.
-An intrument which detects current
a. Ammeter
b. Voltmeter
c. Galvanometer
d. Wattmeter
Answer is option c.
- Varistors are
a. Insulators
b. Non linear resistors
c. Carbon resistors
d. Resistors with zero temperature coefficient
Answer is option b.
-The property of conductor due to which it passes current is called
a. Resistance
b. Conductance
c. Reluctance
d. Inductance
Answer is option b.
- One Newton metre is same as
a. One watt
b. One joule
c. Five joules
d. One joule second
Answer is option d.
- Resistance of carbon filament lamp.....as the applied voltage increases..
a. Increases
b. Decreases
c. Remains same
d. None
Answer is option b.
- Bulbs in street lightning are all connected in
a. Parallel
b. Series
c. Series - Parallel
d. End to end
Answer is option a.
- Sparking occurs when a load is switched off because the circuit has high
a. Resistance
b. Inductance
c. Capacitance
d. Impedance
Answer is option b .
- Which method can be used for absolute measurement of resistance?
a. Lorentz method
b. Releigh method
c. Ohm's law
d. Wheatstone bridge
Answer is option d.
- Ohm's law is not applicable on
a. Semiconductor
b. DC circuits
c. Small resistor
d. High currents
Answer is option a.
- Which of the following materials has the least resistivity?
a. Zinc
b. Lead
c. Mercury
d. Copper
Answer is option d.
- All good conductors have high
a. Conductance
b. Resistance
c. Reluctance
d. Thermal conductivity
Answer is option a.
- Nichrome wire is an alloy of
a. Lead and zinc
b. Chromium and vanadium
c. Nickel and chromium
d. Copper and silver
Answer is option c.
- The superposition theorem requires as many circuits to be solved as there are
a. Source, nodes and meshes
b. Sources and nodes
c. Sources
d. Nodes
Answer is option c.
a. Unilateral circuit
b. Bilateral
c. Passive network
d. Active network
Answer is option c.
a. Resistors
b. Semiconductor
c. Electron tubes
d. Transistor
Answer is option a.
- The concept of superposition theorem is based on
a. Reciprocity
b. Duality
c. Non linearity
d. Linearity
Answer is option d.
- kirchoffs law is applicable to
a. Passive network only
b. Ac circuit only
c. DC circuit only
d. Both ac and DC
Answer is option d.
- The purpose of dummy coil in a generator
a. To reduce Eddy current losses
b. To enhance flux density
c. To amplify voltage
d. To provide mechanical balance for the rotor
Answer is option d.
- Which of the following motors is preferred for operation in highly explosive atmosphere ?
a. Series motor
b. Shunt motor
c. Air Motor
d. Battery operated motor
Answer is option c.
- Which one of the following relays has the capability of anti paying the possible major fault in a transformer ?
a. Over current relay
b. Differential relay
c. Buchholz relay
d. Overfluxing relay
Answer is option c.
- Skin effect depends upon
a. Supply frequency
b. Size of conductor
c. Nature of material
d. All
Answer is option d.
- The speed of a DC motor can be varies by varying
a. Field current
b. Applied voltage
c. Resistance in series with armature
d. Any of these
Answer is option d.
- Bundle conductors in a transmission line
a. Increase radio interference
b. Reduce radio interference
c. No effect
d. None
Answer is option b.
- By using guard ring in a transmission line, it's string efficiency
a. Increases
b. Decreases
c. Remain constant
d. None
Answer is option a.
a. 3
b. 6
c. 9
d. 12
Answer is option b.
- The piezoelectric effect is the polarization of a dielectric under the influence of
a. Light
b. Mechanical stress
c. Electrical stress
d. Heat
Answer is option b.
- On which of the following factors does the value of critical current density in a superconductivity depend?
a. Temperature
b. Applied magnetic field
c. Temperature and applied magnetic field
d. Silsbee's rule
Answer is option d.
- Which of the following is not a ferroelectric material?
a. Rochelle salt
b. Barium titanate
c. Brass
d. Lead zirconate
Answer is option c.
- Who of the following is a ferroelectric material?
a. Stainless steel
b. Wrought iron
c. Boron nitride
d. Y alloy
Answer is option c.
- The ratio of intensity of magnetisation to magnetising force is called
a. Susceptibility
b. Permeability
c. Magnetic potential
d. None of these
Answer is option a.
- Carbon resistors are used extensively because they are
a . Easy to make
b. Compact
c. Inexpensive
d. All of these
Answer is option d.
- Polarization is
a. Scalar quantity
b. Vector quantity
c. Both
d. None of these
Answer is option b.
- Thermistors find use in which of the following?
a. In thermometry
b. In measurement of microwave power
c. As a thermal relay
d. In control devices actuated by temperature change
e. All of these
Answer is option e.
- Temperature inside the furnace is measured by
a. Mercury thermometer
b.optical pyrometer
c.none of these
Answer is option b.
- The electrode of a direct arc furnaces is made of
a. Copper
b. Silver
c.tungston
d. graphite
Answer is option d.
- Battery operated scooter for braking uses
a. Plugging
b. Mechanical braking
c. Regenerative braking
d. Rheostatic
Answer is option b.
- ...........has least range of speed control
a. Slip ring induction motor
b. Synchronous motor
c. D.C. shunt motor
d. Schrage motor
Answer is option b.
- ........has the least value of starting torque of full load torque ratio
a. DC shunt motor
b. DC series motor
c. Squirrel cage induction motor
d. Slip ring induction motor
Answer is option c.
- Rotor of a motor is usually supported on ........ Bearings.
a. Ball or roller
b. Needle
c. Bush
d. Thrust
Answer is option a.
- Reluctance motor is a ......
a. Variable torque motor
b.low torque variable speed motor
c.self starting type synchronous motor
d.low noise, slow speed motor
Answer is option c.
- The travelling speed of cranes varies from
a. 20 to 30 m/s
b. 10 to 15 m/s
c. 5 to 10 m/s
d. 1 to 2.5 m/s
Answer is option d.
- Structural programming is enforced in
a. Pascal
b. Basic
c. FORTRAN
d. None of these
Answer is option a.
- A complete graph with five vertices
a. Non- planar
b. Planar
c. Non-regular graph
d. Tree
Answer is option a.
- The language which is used to retrieve and update data in a management data base, is known as
a. High level language
b. Hardware design language
c. Query language
d. Assembly language
Answer is option c.
- An invalid integer variable is
a. INTEGER
b. JSUM
c. Matrix
d. NUMBER
Answer is option a.
-In an instruction of 8085 microprocessors, how many bytes are present
a. One or two
b. One, two and three
c. One only
d. Two or three
Answer is option b.
-A zener diode, when used in voltage stabilization circuits, is baised in
a. reverse bias region below the breakdown voltage.
b. reverse breakdown region.
c. forward bias region.
d. forward bias content current mode.
Answer is option b.
- The early effect in a bipolar junction transistor is caused by
a. Fast turn on
b. Fast turn off
c. Large collector base region reverse bias
d. Large emitter base forward region
Answer is option c.
- MOSFET can be used as
a. Current controlled capacitor
b. Voltage controlled capacitor
c. Current controlled inductor
d. Voltage controlled inductor
Answer is option b.
- The mean free path for electron drift increases with
a. Purity
b. Strain hardening
c. Elastic modulus
d. None of these
Answer is option a.
- Mobility of electron is highest in
a. Si
b. Ge
c. GaAs
d. C
Answer is option b.
.....................................
- Earth wires are made up of
a. Copper. b. Aluminium
c. Iron. d. Galvanised stranded steel
Answer is option d.
- The resistance of Earth should be
a. Infinite. b. High
c. Low. d. The minimum possible
Answer is option d.
- Which of the following site will be preferred for earthing?
a. Clayey soil. b. Dry and Rocky
c. Wet mashy ground. d. Damp and wet sand pit
Answer is option c.
- The fish blows off by
a. Arcing. b. Burning
c. Melting. d. None of these
Answer is option c.
- The material best suited for manufacturing of fuse wire is
a. Silver. b. Copper
c. Aluminium. d. All of these
Answer is option a.
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