ITI /Diploma Electrician Recruitment Exam Question Papers with Answers
ITI /Diploma Electrician Recruitment Exam Question Papers with Answers Part 2- Question No. 51- 100
Question51:-Fusing factor of a fuse is defined as
A:-Ratio of current rating of fusing element to the minimum fusing current
B:-Ratio of minimum fusing current to the current rating of fusing element
C:-Ratio of current rating to the diameter of fusing element
D:-Ratio of current rating to the breaking capacity of the fuse
Correct Answer:- Option-B
Question52:-The protection offered by RCCB is
A:-Protection from over voltage
B:-Protection from short circuit
C:-Protection from over load
D:-Protection from electric shock
Correct Answer:- Option-D
Question53:-What is the advantage of the concealed wiring?
A:-Easy to maintain
B:-Less voltage drop
C:-High insulation resistance
D:-Protection against moisture
Correct Answer:- Option-D
Question54:-Which type of accessories are used to tap supply for a portable
appliance?
A:-Safety accessories
B:-Holding accessories
C:-Controlling accessories
D:-Outlet accessories
Correct Answer:- Option-D
Question55:-Maximum load allowed on light and fan sub circuit as BIS?
A:- 3000 W
B:-2000 W
C:-800 W
D:-600 W
Correct Answer:- Option-C
Question56:-The factor deciding the thickness of the insulation of a cable?
A:-Current
B:-Temperature
C:-Power factor
D:-Voltage
Correct Answer:- Option-D
Question57:-What is the unit of luminous intensity?
A:-Lux
B:-Lumen
C:-Candela
D:-Steradian
Correct Answer:- Option-C
Question58:-Which is the cold cathode lamp?
A:-Halogen lamp
B:-Neon sign lamp
C:-Fluroscent lamp
D:-Mercury vapour lamp
Correct Answer:- Option-B
Question59:-The unit of luminous efficiency is
A:-Lux
B:-Lumen
C:-Lumens/
D:-Lumens/Watt
Correct Answer:- Option-D
Question60:-The minimum diameter of G I pipe used in pipe earthing is
A:-28 mm
B:-28 cm
C:-38 mm
D:-38 cm
Correct Answer:- Option-C
Question61:-The induced voltage in the armature of a separately exited dc
generator is characterized as
A:-Unidirectional but discontinuous
B:-Unidirectional but continuous
C:-Alternating and pulsating
D:-None of the above
Correct Answer:- Option-C
Question62:-In a DC electrical machine, the armature laminations are perforated for
air ducts to
A:-Enable frictionless movement of armature rotor
B:-Reduce the hysteresis losses
C:-Reduce the eddy current losses
D:-Enable cooling and air ventilation
Correct Answer:- Option-D
Question63:-Determine the armature power developed by a 200 V DC shunt motor
taking a power input of 20 kW. Armature and field resistances are 0.05 Ω and 100 Ω
respectively.
A:-17.32 kW
B:-19.12 kW
C:-20.63 kW
D:-16.54 kW
Correct Answer:- Option-B
Question64:-In a DC machine pole shoes are designed with larger cross section
than pole core. It improves
A:-Magnetizing field strength
B:-Current flow through the field winding
C:-Flux per pole entering the armature
D:-All of the above
Correct Answer:- Option-C
Question65:-The direction of rotation of a DC shunt motor can be reversed by
A:-Reversing the current through either armature or field coils
B:-Reversing the current through armature and field coils at the same time
C:-Reversing the motor input terminals
D:-None of the above
Correct Answer:- Option-A
Question66:-If two identical traction motors are available in pair, then their
efficiency can be determined by
A:-Hopkinsons test
B:-Field test
C:-Sumpners test
D:-Swinburnes test
Correct Answer:- Option-B
Question67:-In a wave wound DC machine, the mechanical balance of armature can
be achieved by using
A:-Equalizer connection
B:-Split rings
C:-High mica insulation between commutator segments
D:-Dummy coils
Correct Answer:- Option-D
Question68:-A 230 V DC shunt generator has a maximum efficiency of 82%. When
delivering an output power of 41 kW. Determine the magnitude of constant losses
in the machine
A:-4.5 kW
B:-50 kW
C:-8 kW
D:-20.5 kW
Correct Answer:- Option-A
Question69:-A 240 V DC series motor has an armature resistance of 0.4Ω and series
field resistance of 0.1Ω and takes 40 A at rated load. Calculate the value external
starting resistance required to limit the starting current of 120% of rated load
current. (Neglect the brush drop)
A:-4.5 Ω
B:-0.5 Ω
C:-10 Ω
D:-5 Ω
Correct Answer:- Option-A
Question70:-A DC series motor undergoes an open circuit fault in the field winding
while driving a mechanical load. The motor will
A:-Stop
B:-Attain dangerously high speed
C:-Operate at a lower speed
D:-Operate at lower efficiency
Correct Answer:- Option-A
Question71:-The energy efficiency of a single phase distribution transformer is
determined as
A:-output in kWh/Input in kWh
B:-output in KVA/Input in kVA
C:-Output in KW/Output in kW+losses
D:-1−losses/output in kW
Correct Answer:- Option-A
Question72:-When the insulating oil in a transformer cools down, it contracts and
air drawn in to the transformer from atmosphere. This is termed as
A:-Breathing
B:-Magnetostriction
C:-Co-efficient of thermal expansion
D:-Sludging
Correct Answer:- Option-A
Question73:-Among the following three phase transformer connections, which one
is best suited to maintain service continuity even during a fault in one phase
A:-Delta-Delta
B:-Star-Star
C:-Delta-Star
D:-Star-Delta
Correct Answer:- Option-A
Question74:-Consider following facts about short pitch winding of an alternator
i. It increases magnitude of generated emf
ii. It improves induced emf waveform
iii. It reduces eddy current and hysteresis losses
iv. Increases the power rating of machine
v. It helps to save winding copper
Which among the statements are correct?
A:-i, ii, iii, iv
B:-ii, iii,v
C:-i, iii, iv, v
D:-ii,iii,iv
Correct Answer:- Option-B
Question75:-The output power delivered from an alternator can be increased by
A:-Increasing the field current
B:-Increasing the prime mover output
C:-Decreasing the rotor speed
D:-Decreasing the armature voltage
Correct Answer:- Option-B
Question76:-A synchronous motor running under constant excitation meet the
increased load demand by an increase in armature current. This increase in
armature current is due to
A:-Drop in power factor
B:-Decrease in motor speed
C:-Increase in supply voltage
D:-Rise in resultant voltage across the armature
Correct Answer:- Option-D
Question77:-Ratio of starting current to full load current of a three phase induction
motor is 5 : 2. If the full load slip is 4%, determine the ratio of starting torque to full
load torque
A:-5 : 2
B:-1 : 10
C:-1 : 4
D:-3 : 1
Correct Answer:- Option-C
Question78:-In the case of an induction motor, the purpose of stator frame is to
A:-Complete the stator magnetic flux path
B:-Provide mechanical support to stator
C:-Provide natural ventilation
D:-Maintain a rotating magnetic field of constant magnitude
Correct Answer:- Option-B
Question79:-Operating speed of an universal motor:
A:-Increase with increase in supply frequency
B:-Decrease with increase in supply frequency
C:-Increases for frequencies beyond 50 Hz
D:-Independent of supply frequency
Correct Answer:- Option-D
Question80:-The mechanism for disconnecting the capacitor in a capacitor start
induction motor failed to operate when the motor picks up the speed. Then
A:-The motor will revolve in reverse direction
B:-The capacitor will be damaged
C:-The main winding will get damaged
D:-The motor rotate in dangerously high speed
Correct Answer:- Option-B
Question81:-What is the hexadecimal equivalent of the binary number 010 1110
A:-2 E
B:-1 E
C:-5 C
D:-2 F
Correct Answer:- Option-A
Question82:-Which of the following is the binary value of the hexadecimal number
9A
A:-10101001
B:-10001000
C:-10011010
D:-10101010
Correct Answer:- Option-C
Question83:-Which of the following term represents logic high level in positive logic
system?
A:-true
B:-off
C:-open
D:-no
Correct Answer:- Option-A
Question84:-How many outputs are in a half-adder circuit?
A:-one
B:-three
C:-two
D:-none
Correct Answer:- Option-C
Question85:-Name the flip-flop which gives valid output when both its inputs are
high
A:-J-K flip-flop
B:-D-flip flop
C:-R-S flip-flop
D:-Clocked-RS flip-flop
Correct Answer:- Option-A
Question86:-How many clock pulses are required for an 8-bit serial-in-parallel out
shift register
A:-4
B:-16
C:-12
D:-8
Correct Answer:- Option-D
Question87:-Which of the following concept is for a digital to analog converter
A:-Dual slop
B:-Binary weighted resistors
C:-Stair step-ramp
D:-Successive approximation
Correct Answer:- Option-B
Question88:-The terminal count of a typical modulus-10 binary counter is
A:-0000
B:-1010
C:-1001
D:-1111
Correct Answer:- Option-C
Question89:-___________ solders are used for glass-to-glass and glass-to-metal
soldering.
A:-Tin-zinc
B:-Indium-tin
C:-Lead-silver
D:-Cadmium-Zinc
Correct Answer:- Option-B
Question90:-A serial-in-parallel out 4 bit from shift register initially contains all 1’s.
The data 0111 is waiting to enter. After four clock pulses the register contains
A:-0000
B:-1111
C:-0111
D:-1000
Correct Answer:- Option-C
Question91:-Ripple factor of half-wave rectifier is
A:-1.21
B:-1.3
C:-0.48
D:-1.414
Correct Answer:- Option-A
Question92:-The basic purpose of filter in a rectifier is to
A:-Minimize variations in ac input signal
B:-Suppress harmonics in rectified output
C:-Stabilize dc output voltage
D:-Remove ripples from the rectified output
Correct Answer:- Option-D
Question93:-A voltage controlled oscillator is
A:-Leading oscillator
B:-Relaxation oscillator
C:-Ticker oscillator
D:-Wein bridge oscillator
Correct Answer:- Option-B
Question94:-If the reverse bias on the gate of a JFET is increased, then width of the
conducting channel
A:-is increased
B:-is decreased
C:-remains the same
D:-none of the three
Correct Answer:- Option-B
Question95:-What are the three terminals of a TRIAC?
A:-emitter, base 1 and base 2
B:-gate, source and sink
C:-base, emitter and collector
D:-gate, anode 1 and anode 2
Correct Answer:- Option-D
Question96:-In IGBT, the layer connected to the collector terminal is called as the
A:-drift layer
B:-injection layer
C:-body layer
D:-collector layer
Correct Answer:- Option-B
Question97:-An SCR combines the features of
A:-a rectifier and resistance
B:-a rectifier and capacitor
C:-a rectifier and transistor
D:-a rectifier and inductor
Correct Answer:- Option-C
Question98:-A voltage source inverter is used when source and load inductances
are respectively
A:-Small and small
B:-Large and large
C:-Large and small
D:-Small and large
Correct Answer:- Option-D
Question99:-An ideal regulated power supply is one which has voltage regulation of
A:-5%
B:-0%
C:-10%
D:-1%
Correct Answer:- Option-B
Question100:-What is the effect in internal resistance of a discharged cell?
A:-Increase
B:-Decrease
C:-Becomes zero
D:-Remain same
Correct Answer:- Option-A