JVVNL Technical Helper Important MCQs In English-01, We advise all the applicants to work hard for the preparations. We are here to help you with exam preparations. Here in our post, you will find JVVNL Technical Helper Important MCQs In English. We hope this will be helpful for all the candidates to prepare a strong groundwork for the Technical helper Exam.
JVVNL Technical Helper Important MCQs In English-01
1. A substance that has a high retentivity can be used for the manufacture of…….
( A ) Electromagnet
( B ) Permanent magnets
( C ) Temporary magnets
( D ) Paramagnets
Ans – (B)
2. Which of the following has almost no change in resistance with temperature change?
( A ) Nickel
( B ) Nachrome
( C ) Aluminium
( D ) Manganin
Ans – (D)
3. If the size of the circuit copper conductor is 10 sq. mm, then the size of the earth conductor in G.I wire should be :
( A ) 1.5 sq. mm
( B ) 2.5 sq. mm
( C ) 15sq.mm
( D ) 10 sq.mm
Ans – (D)
4. Invertors converts
( A ) DC to AC
( B ) AC to DC
( C ) DC to DC
( D ) AC to AC
Ans – (A)
5. What is the normal voltage of a fully charged lead acid cell ?
( A ) 1.1 V
( B ) 2.2V
( C ) 1.15V
( D ) 13V
Ans – (B)
6. A material that is slightly repelled by a magnet is called
( A ) Magnetic
( B ) Paramagnetic
( C ) Diamagnetic
( D ) Ferromagnetic
Ans – (C)
7. The rectifier is used to convert
( A ) AC to DC
( B ) DC to AC
( C ) Pulsating current to alternating current
( D ) Both ( A ) and ( B )
Ans – (A)
8. Cooling of transformer is necessary to
( A ) Increase the efficiency
( B ) Reduce the losses
( C ) Reduce humming
( D ) Dissipate the heat
Ans – (D)
9. An AC the circuit has 40 ohms of resistance, 90 ohms of inductive reactance and 60 ohms of capacitive reactance. Then the impedance is equal to
( A ) 50 ohms
( B ) 70 ohms
( C ) 210 ohms
( D ) 190 ohms
Ans – (A)
10. The fuse operates due to the……………effect of current
( A ) Magnetic
( B ) Electrostatic
( C ) Heating
( D ) None of these
Ans – (C)
11. What is the inter-layer insulation for small transformers?
( A ) Mica
( B ) Butter paper
( C ) Leatheroid paper
( D ) Varnish
Ans – (B)
12. An insulated conductor used in a switchboard shall be…..
( A ) Listed
( B ) Flame retardant
( C ) Rated not less than the voltage applied to other conductors or busbars with which it may come in contact
( D ) All of these
Ans – (D)
13. A motor has become thoroughly wet because of exposure to heavy rains. Before operating the motor, it is necessary to dry it out by
( A ) Wiping it dry with a clean cloth
( B ) Keeping it under a ceiling fan
( C ) Blowing hot air by using air blower
( D ) Placing it in an Ovens
Ans – (D)
14. For a circuit rated for 5 Amps, the correct tinned copper wire size will be
( A ) 35 SWG
( B ) 36 SWG
( C ) 37 SWG
( D ) 38 SWG
Ans – (A)
15. Base and covers of the wiring accessories are made of
( A ) Ignitable material
( B ) Non-ignitable material
( C ) Conductive material
( D ) Heat resistive material
Ans – (B)
16. Phase relationship between the applied voltage and the current flowing through the inductive circuit is
( A ) Current leads the voltage
( B ) Voltage lags the current
( C ) Current lags the voltage
( D ) Current in phase with the voltage
Ans – (C)
17. The illumination required for a work place where fine work is performed will be in the order of
( A ) 500 lumens/sq. meter
( B ) 1000 lumens/sq. meter
( C ) 1500 lumens/sq. meter
( D ) 2000 lumens/sq. meter
Ans – (C)
18. The capacitor used in a fan motor is connected in
( A ) Parallel with starting winding
( B ) Parallel with starting and running winding
( C ) Series with the starting winding
( D ) Series with starting and running winding
Ans – (C)
19. Power companies are interested in improving the power factor to
( A ) Reduce the line current
( B ) Increase the motor efficiency
( C ) Increase the volt-amperes
( D ) Decrease the power
Ans – (A)
20. In cables, the thickness of the layer of insulation on the conductor depends upon
( A ) Current capacity
( B ) Voltage
( C ) Power factor
( D ) Reactive power
Ans – (B)
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