Liquid Propulsion System Centre Previous Question Paper |Indian Space Reserach Organisation Electrician Paper 2016
| Sr. No. | Question |
| 1 | Conductance depends the reciprocal of
(a) Only on Length (b) Only of resistivity (c) Only on the area of cross section (d) On all the above three |
| 2 | Dielectric Strength of a medium is usually expressed in
(a) kV/mm (b) Coulomb/sq.m (c) Netons/mm (d) Joules/sq.m |
| 3 | One Volt is same as
(a) One Coulomb (b) One Joule (c) One Joule/ Coulomb (d) One Coulomb/joule |
| 4 | Hysteresis loss least depends on
(a) Magnetic Field intensity (b) Frequency (c) Ambient temperature (d) Volume of material |
| 5 | The magnitude of induced e.m.f is directly proportional to the
(a) Rate of change of current (b) Rate of change of flux linkage (c) Constant value of current (d) Resistance |
| 6 | In DC generators, current to external circuit from armature is given through
(a) Slip rings (b) Commutator (c) Solid Connections (d) Armature winding |
| 7 | Which DC motor will be preferred for machine tools
(a) Series motor (b) Shunt motor (c) Differentially Compounded motor (d) Cumulatively compounded motor |
| 8 | Which motor has poorest speed control
(a) Series motor (b) Shunt motor (c) Differentially Compounded motor (d) Cumulatively compounded motor |
| 9 | A 4 pole DC generator rotates at 1500 rpm. How many times in a second, will the emf induced in each armature conductor changes its direction
(a) 50 (b) 100 (c) 200 (d) 400 |
| 10 | Conductance depends the reciprocal of
(a) Only on Length (b) Only of resistivity (c) Only on the area of cross section (d) On all the above three |
| 11 | Which of the following wave has the highest value of peak factor
(a) Sine wave (b) Square wave (c) Triangular wave (d) Half wave rectified sine wave |
| 12 | The time period for the frequency of 1 MHz is
(a) 0.01 second (b) 1 milli second (c) 1 micro second (d) 1 pico second |
| 13 | The voltage of domestic supply is 220V, this figure represents
(a) Peak value (b) RMS value (c) Average value (d) Mean value |
| 14 | A coil includes 200mV when the current changes at the rate of one ampere per second. The value of inductance is
(a) 2000 mH (b) 200 mH (c) 20 mH (d) 2 mH |
| 15 | Which of the following materials has the highest value of dielectric constant
(a) Oil (b) Glass (c) Vacuum (d) Ceramics |
| 16 | The power dissipated in a pure capacitor is
(a) Proportional to applied voltage (b) Proportional to value of capacitance (c) Both (a) & (b) (d) Zero |
| 17 | A practical method to improve the lagging power factor of a fluorescent lamp is to
(a) Increase the voltage across the lamp (b) Connect a capacitor across the starter (c) Connect a capacitor across the lamp circuit (d) Connect the capacitor series with ballast |
| 18 | When two wattmeters are used to measure power a 3 phase balance circuit and one wattmeter reads negative, it means the angle of lag is
(a) 0 degree (b) 30 degree (c) 45 degree (d) Above 60 degree |
| 19 | By adding more resistance to a R-L circuit the angle of phase difference will be
(a) Increase (b) Decrease (c) No change (d) Zero |
| 20 | An auto transformer working in the principle of
(a) Mutual induction (b) Self induction (c) Heating (d) Split phase |
| 21 | The ‘hum’ in a transformer is produced due to
(a) Eddy currents (b) Load variations (c) Magnetic forces (d) Lightning |
| 22 | Which of the following statement is FALSE
(a) For the same KVA rating an auto transformer has higher efficiency (b) Oil in transformer serves the purpose of cooling as well as insulation (c) A transformer is always free from windage losses (d) None of the above |
| 23 | Buchholz relay works on the principle of
(a) Loss of dielectric strength of transformer oil due to presence of moisture (b) Magnetostriction in core causing violent vibration (c) Violent gas generation before transformer break down (d) Smoke generated by Burning of insulation materials |
| 24 | The full load copper of transformer is 1600 watts. At half load, the copper loss will be
(a) 600 W (b) 6400 W (c) 800 W (d) 400 W |
| 25 | Clip on ammeter as
(a) High voltage ration transformer (b) Step up transformer (c) Potential transformer (d) Current transformer |
| 26 | The magnetic coupling between primary and secondary sides of a transformer can be improved by
(a) Using winding materials of low resistivity (b) Using insulation of better quality between the windings (c) Using the magnetic core of low reluctance (d) Using oil of high dielectric strength |
| 27 | Which of the following is NOT an essential condition for running two transformer in parallel
(a) Same polarity (b) Same KVA rating (c) Same voltage ratio (d) Same percentage impedance |
| 28 | Heating value of coal is around
(a) 1000 kcal/kg (b) 2000 kcal/kg (c) 6000 kcal/kg (d) 10000 kcal/kg |
| 29 | In a nuclear power plant which of following is used to slow down the fast neutrans?
(a) Reflector (b) Shield (c) Control rod (d) Moderator |
| 30 | Diesel engines are supercharged
(a) To increase air-fuel ratio (b) To reduce combustion temperature (c) To improve heat transfer (d) To increase specific power output |
| 31 | A synchronous condenser is generally installed at the
(a) Sending end of the transmission line (b) Receiving end of the transmission line (c) Middle of the transmission line (d) Point of least resistance along the transmission line |
| 32 | Choose the correct order of the cable construction from inner to outer
(i) Conductor (ii) Sheathing (iii) Armouring (iv) Insulation (a) i, ii, iii, iv (b) i, iv, ii, iii (c) i, iv, iii, ii (d) iv, iii, ii, i |
| 33 | An isolator is installed
(a) as a substitute for circuit breaker (b) always independent of the position of circuit breaker (c) Generally on both sides of circuit breaker (d) To operate the relay of circuit breaker |
| 34 | For a given size of motor, the fuse rating of a induction motor depends
(a) Power factor (b) Method of installation (c) Method of starting (d) Speed of motor |
| 35 | A circuit breaker can be operated
(a) Manually (b) Automatically (c) By remote control (d) All the above |
| 36 | Which of the following motor has series characteristics
(a) Repulsion motor (b) Shaded pole (c) Capacitor start motor (d) None of the above |
| 37 | The luminous flux received by a surface per unit area is called
(a) Candle power (b) Illumination (c) CRI (d) Brightness co-efficient |
| 38 | Increase in voltage for a GLS lamp reduces
(a) Efficiency (b) Wattage (c) Light output (d) Life |
| 39 | In electric discharge lamps, bluish white colour is given by
(a) High pressure sodium vapour (b) Mercury vapor at high pressure (c) Mercury vapour at low pressure (d) Chlorine gas |
| 40 | An alternator having 8 poles rotating 250 rpm will have frequency of voltage generated as
(a) 60 Hz (b) 50 Hz (c) 25 Hz (d) None of these |
| 41 | The speed of an alternator is changed from 3000 rpm to 1500 rpm. The generated emf/phase will become
(a) Double (b) Unchanged (c) Half (d) One fourth |
| 42 | In alternator negative regulation can be expected in case of
(a) Slow speed alternators (b) High speed alternators (c) Leading power factor load (d) Lagging power factor load |
| 43 | A synchronous motor is better power factor as compared to that of an equivalent induction motor. This is mainly because
(a) Synchronous motor has no slip (b) Stator supply is not required to produce magnetic field (c) Load on the rotor remains constant (d) Has large air gap |
| 44 | A four pole, 50 Hz, 440 V, 3 phase induction motor with 3% slip will run on
(a) 1550 rpm (b) 1500 rpm (c) 1495 rpm (d) 1455 rpm |
| 45 | The speed of a squirrel cage induction motor can be controlled by all of the following methods except
(a) Reducing supply voltage (b) Changing rotor winding resistance (c) Changing no. of poles (d) Changing supply frequency |
If you are searching electrician previous question then You may also check these model paper for updating your knowledge
Electrician model question paper
Electrician Practice Paper
Electrician Technician Sample Paper
Electrician Question Bank
Electrician Paper for Practice
Electrician trade model paper
Electrician Study Material
Electrician Sample Paper
Leave a Reply