Electrician - Health Services, Medical Education Service, Archaeology Answer Key 047/2017

Name of post : Electrician
Department : health services/medical education service/archaeology
Category No : 235/16, 351/16, 448/16
Paper code : 47/2017
Date of test :03/05/2017

Colpitt’s oscillator is a
- Square wave oscillator
- Sinusoidal Oscillator
- Nonsinusoidal oscillator
- Sound generator
According to Faraday’s law, induced emf is directly proportional to
- Maximum flux
- Rate of change of flux linkages
- Time
- Flux density
Differential compound generator is a/an
- Self-excited generator
- Separately excited generator
- Alternator
- Function generator
EMF equation of a dc generator is
- None of these
Speed is a ____________ quantity.
- Scalar
- Vector
- A or B
- None of these
Which type of DC compound generator is used when the load is very far away from the generator?
- Level compounded
- Under compounded
- Over compounded
- Differentially compounded
Pitch of lap winding
- Y_B
- Y_B – Y_F
- Y_B + Y_F
- Y_F
Transformers are rated in
- KVA
- KW
- KVAR
- MW
In a transformer, I₁/ I₂ =
- E₁/E₂
- E₂/E₁
- N₁/N₂
- None of these
Turns ratio of isolation or one-to-one transformer is
- Greater than 1
- Less than 1
- 1
- 2
Hysteresis loss, W_h =
Class 0.1 instruments are used as
- Portable instrument
- Industrial measuring instruments
- Precision measuring instruments
- Panel measuring instrument
Which is an absolute instrument?
- Ammeter
- Wattmeter
- Voltmeter
- Tangent Galvanometer
If the pointer of measuring instrument moves quickly to its final deflected position, it is
- Overdamped
- Under damped
- Critically damped
- Not damped
Power factor =
- KVA/KW
- KVAR/KW
- KW/KVAR
- KW/KVA
The ratio Z/R is
- Reciprocal of power factor
- Power factor
- Reciprocal of form factor
- Form factor
PIC is the part of
- MI voltmeter
- Induction energymeter
- Digital energy meter
- Induction wattmeter
Tong-tester is used to measure
- Power
- Voltage
- Energy
- Alternating current
Collector current, I_C of BJT =
- I_E + I_B
- I_E – I_B
- I_E – 2I_B
- I_E + 2I_B
Capacitive reactance is
- Directly proportional to frequency
- Directly proportional to capacitance
- Independent on frequency
- Inversely proportional to frequency
Current gain of common base amplifier is
- Always less than 1
- Always greater than 1
- Equal to 1
- None of these
Frequency of rotor current of induction motor is
- Frequency of stator current
- Slip × frequency of stator current
- Frequency of stator current/slip
- Slip/frequency of stator current
Which of the following motor is not self-starting?
- Universal motor
- DC shunt motor
- Single phase induction motor
- 3 phase induction motor
Electric charge, Q =
- V*t
- V/t
- I/t
- I*t
Which is wrong about the speed control of dc shunt motor by field control method?
- It is economical
- Speed can be varied above normal speed
- Speed cannot be varied above normal speed
- Commutation becomes unsatisfactory
Which is constant speed motor?
- Synchronous motor
- Universal motor
- DC series motor
- DC compound motor
Unit of mmf
- Weber
- Ampere turns
- Tesla
- Henry
Negative plate of lead acid cell is
- Lead peroxide
- Lead sulphate
- Nickel
- Spongy lead
As per IE rule, the leakage current in an installation should not exceed ___________ part of full load current of installation.
- 1/50
- 1/600
- 1/5000
- 1/1000
Capacitance =
- Potential difference / Charge
- Charge / Current
- Current / Charge
- Charge / Potential difference
Permeance is the reciprocal of
- Permittivity
- mmf
- Reluctance
- Flux
Energy stored in magnetic field, E =
- (LI²)/2
- (LI)/2
- (L²I²)/2
- (L²I)/2
The Ah efficiency of lead acid cell is normally between
- 90 – 95%
- 30 – 35%
- 70 – 75%
- 60 – 65%
Insulation resistance can be measured using
- Tong tester
- Multimeter
- Meggar
- Ohmmeter
There is no control spring in
- PMMC voltmeter
- Induction energymeter
- PMMC ammeter
- Dynamometer instrument
Standard form of an alternating voltage, e =
- E_m Sin 2π fT
- E_m Sin 2π ft
- E_m Cos 2π fT
- E_m Cos 2π ft
A sine wave has an angular frequency of 100radian/sec. Its frequency is
- 100 Hz
- 200 Hz
- 25 Hz
- 50 Hz
Percentage slip, S =
- 100 (Ns - N) / Ns
- 100 (N - Ns) / N
- 100 (Ns - N) / N
- 100 (N - Ns) / Ns
Stray losses are
- Copper loss
- Magnetic and mechanical losses
- Eddy current loss
- Hysteresis loss
Transformer gives maximum efficiency, when
- Hysteresis loss = Eddy current loss
- Copper loss = Hysteresis loss
- Copper loss = Mechanical loss
- Copper loss = Iron loss
All day efficiency of transformer is
- Output in KW/ Input in KW (for 24 hrs)
- Output in KVA/ Input in KVA (for 24 hrs)
- Output in KW/ Input in KVA (for 24 hrs)
- Output in KWh/ Input in KWh (for 24 hrs)
A transformer consists of 1000 primary turns and 1600 secondary turns. What is the secondary induced emf if primary voltage is 250 V?
- 360 V
- 400 V
- 500 V
- 450 V
Synchronous speed, Ns =
- 120 f/ p
- 120 p/ f
- 60 p/ f
- 60 f/ p
Which of the following has negative temperature coefficient of resistance?
- Silicon
- Copper
- Iron
- Brass
Secondary of a CT must be connected to an ammeter or must be short-circuited in order to avoid
- High secondary emf
- Increase in iron loss
- Excessive heating of the core
- All of these
Rotor speed of 3 phase, 4 poles, 50 Hz induction motor
- 1440 RPM
- 1500 RPM
- 1560 RPM
- 1600 RPM
Barrier potential of silicon at room temperature of 25°C is
- 0.3 V
- 0.4 V
- 0.7 V
- 0.9 V
Power rating of low power transistors are
- up to 10 watts
- up to 20 watts
- Less than 2 watts
- up to 15 watts
Convert decimal 9 to binary.
- 1011
- 1000
- 1100
- 1001
Boolean expression for OR gate is
- Y = AB
- Y = A + B
- Y = A̅ ̅B̅
- Y = A̅ + B̅
Which connection is best suited for 3 phase, 4 wire service?
- Delta-Delta
- Star-Star
- Delta-Star
- Star-Delta
The scale range marked on the dial of the meggar is
- 500 Megaohm to zero ohm
- Infinity to zero ohm
- 50 Megaohm to zero ohm
- 1000 Megaohm to zero ohm
Fusing factor is
- Ratio between minimum fusing current to current rating
- Time taken by a fuse to interrupt the circuit in the event of fault
- Safe maximum current that can pass through it continuously without overheating
- Current at which fuse element melts
1500 RPM = ____________ RPS.
- 50
- 60
- 40
- 25
1 Kg wt = ___________ Newton.
- 5.3
- 6.7
- 9.8
- 12.6
The direction of force produced on a current carrying conductor placed in a magnetic field can be determined by
- Fleming’s Right Hand Rule
- Cork Screw Rule
- Fleming’s Left Hand Rule
- Lenz’s Law
Differential compound generators are suitable for
- Electroplating
- Arc welding
- Lighting
- Battery charging
When a BJT operates in cut off
- V_CE = V_CC
- V_CE = 0
- V_CE = V_CC / 2
- V_CE = 0.75 V_CC
In a BJT, β(Beta) =
- (1-α)/α
- (1+α)/α
- α/(1+α)
- α/(1-α)
Efficiency of class A amplifier is
- Between 50% – 60%
- Less than 50%
- Nearly 90%
- Between 50% and 75%
Mechanical equivalent of heat, J is
- 36105 Joules
- 4186 Joules/K Cal
- 3186 Joules/Cal
- 5186 Joules/K Cal
1 KWh = _________ Joules.
- 3600
- 36×10³
- 36×10⁵
- 36×10⁶
1 Joule/second is equal to
- 1 Watt
- 1 Calorie
- 1 Newton
- 1 Henry
1 Coulomb of charge is defined as that charge which when placed in vacuum from equal and similar charge, repels it with a force of ________ N.
- 9×10⁹
- 9×10⁶
- 9×10^-9
- 9×10¹⁸
Dielectric strength of air in KV/mm
- 2.1
- 15
- 3.2
- 8.4
Capacitor that stores a charge of 0.005 C at 10 volts has a capacitance of __________ Farad.
- 0.05
- 0.0005
- 5×10^-3
- 5×10^-6
Unit of magnetic field strength (H) is
- Newton/Weber
- Ampere Turns
- Weber
- Henry
MMF/Reluctance is equal to
- Permeance
- Field strength
- Flux
- Permeability
Relative permeability, µ_r=
- B²/H
- H/B
- B²H
- Bmaterial/Bvacuum
____________ is used as electrolyte in Nickel-Iron battery.
- H₂SO₄
- HCl
- MnO₂
- KOH
Average emf of Edison cell is
- 2.1 V/cell
- 2.5 V/cell
- 2.7 V/cell
- 1.2 V/cell
When three capacitors C1, C2 and C3 are connected in parallel, total capacitance will be
- 1/C = 1/C1 + 1/C2 + 1/C3
- C = 1/C1 + 1/C2 + 1/C3
- C = C1 + C2 + C3
- C =(C1 + C2 + C3)/(C1 C2 C3)
____________ammeter will be used to measure alternating current only.
- Moving iron
- Induction
- PMMC
- Electrodynamic
Time period of 100 Hz alternating quantity is
- 0.05 seconds
- 0.02 seconds
- 0.03 seconds
- 0.01 seconds
Average value Form factor =
- Peak value
- Peak to peak value
- Instantaneous value
- rms value
The critical value of loop gain of an oscillator, K Av is
- Equal to 1
- Less than 1
- Greater than 1
- Equal to 0
Resonant frequency of an RLC series circuit
- 1/(2π √(LC))
- 1/(4π √(LC))
- 1/√(2πLC)
- 1/√(2π √(LR))
LSI integrated circuits consists of ______________ transistors.
- 10 to 100
- 1 to 10
- 100 to 1000
- 50 to 500
Question error
Hexadecimal [23]₁₆ = ____________
- [23]₁₀
- [44]₁₀
- [35]₁₀
- [28]₁₀
Base of a transistor is _____________doped.
- Heavily
- Very lightly
- Moderately
- Not
Which National Leader of India is known as ‘Prince of Workers’?
- Sardar Vallabhbhai Patel
- Lala Lajpath Roy
- Bal Gangadhara Tilak
- Gopal Krishna Ghokale
Who is known as ‘Akbar of British India’?
- Lord Wellesley
- Lord Canning
- Lord Hardinge
- Lord Rippon
Who was the first British Viceroy to visit Kerala?
- Lord Lytton
- Lord Wavell
- Lord Curzon
- Lord Mount Batten
Which is the most abundant metal in the Earth’s crust?
- Iron
- Aluminium
- Nickel
- Silicon
Who among the following is associated with the discovery of rings of Saturn?
- Copper Nikos
- Christian Hugguins
- Galileo
- Bhaskaracharya
How many delegates had attended the first session of Indian National Congress?
- 82
- 72
- 92
- 98
India changed over to the decimal system of coinage in
- April 1957
- April 1935
- April 1950
- April 1947
Which country has the largest coastline?
- USA
- India
- Australia
- Canada
The National Anthem was first sung in the year?
- 1930
- 1911
- 1935
- 1947
Where is the Railway Staff College located?
- Chennai
- Bhopal
- Pune
- Vadodara
Who was the author of the book ‘Story of an Escape’?
- Surjith Singh Bernala
- Nirupama Rao
- Dr. M. S. Venkatesh
- Dr. Ramesh Kumar Sharma
India’s first Post Office Passport Seva Kendra (POPSK) has been inaugurated in which city?
- Kochi
- Bhopal
- Mysuru
- Chennai
The World Hindi Day is observed on which date?
- January 10
- January 12
- February 10
- February 12
Which Indian State has became the first to introduce cashless system for Public distributing system of food grains?
- Sikkim
- Gujarat
- Madhya Pradesh
- Punjab
Which of the following State will host the 2022 National Games?
- Karnataka
- Rajasthan
- Bihar
- Meghalaya
Who compiled ‘The Travancore State Manual’?
- Munro
- Mecaulay
- V. Nagam Aiya
- William Logan
Who founded the ‘Vidya Poshini Sabha’?
- Sahodharan Ayyappan
- Swami Agamananda
- Chattampi Swamikal
- Vagbhadananda
Who was called the ‘Simhala Simham’?
- Ayyankali
- Dr. Palpu
- K. Kelappan
- C. Kesavan
Name the leader related to the ‘Muthukulam Speech’ of 1947.
- Pattom Thanupillai
- Mannthu Padmanabhan
- V. T. Bhattathirippad
- Pandit Karuppan
In which year Sree Narayana Guru held an all religions conference at Advaithasramam Aluva?
- 1922
- 1914
- 1924
- 1918

1 Comments

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