Paper sets of 100 questions (20-20 quiz) part-1

TECHNICAL APTITUDE

Q1:-SCR is also called as 

1. transistior
2. thyristor
3. diode
4. resistor

ANSWER:-2

Q2:-The function of conservator in a transformer is to 

1. store extra oil to be used in emergency
2. prevent entry of moisture
3. coll transformer
4. take care of expansion and contraction of oil due to change in temperatue of oil

ANSWER:-4

Q3:-The superposition theorem is used when the circuit contains

1. active element only
2. a single voltage source
3. a number of voltage sources
4. passive element only

ANSWER:-3

Q4:- The minimum area of cross section of a three and half coe cable should be ?

1. 30 square cm
2. 60 square cm
3. 50 square cm
4. 40 square cm

ANSWER:-3

Q5:- The reactive power generated by a synchronous alternator can be controlled by ?

1. changing the field excitation
2. changing the alternator speed
3. changing the terminal voltage 
4. changing the prime mover i/p

ANSWER:-1

Q6:-Which instrument is used to measure the high resistance ?

1. megger
2. wheat stone bridge
3. carey foster bridge
4. kevin's double bridge 

ANSWER:-1

Q7:- In a pure inductive circuit if the supply frequency is reduced to 1/2 , the current will ?

1. be four times as high
2. be reduced to one fourth
3. be double
4. be reduced by half

ANSWER:-3

Q8:- Which of the following motors is preferred for tape recorders ?

1. two valve capacitor motor
2. Hysteresis motor
3. universal motor 
4. shaded motor

ANSWER:-2

Q9:- Which of the following fault is coming under symmetrical fault?

1. LL fault
2. LLLG fault
3. LG fault
4. LLG fault

ANSWER:-2

Q10:- What is the power consumed by the resistor of 20 ohm connected across 100 v source ?

1. 100 w
2. 50 w
3. 300 w
4. 500 w

ANSWER:-4

Q11:- A lissajous pattern on an oscilloscope has 5 horizontal tangencies and 2 vertical tangencies. The frequency of the horizontal i/p is 100 Hz. The frequency of the vertical i/p will be.

1. 4000 Hz
2. 2500 Hz
3. 5000 Hz
4. 400 Hz

ANSWER:-2

Q12:- A bar of iron 1 square cm in cross section has 10^(-4) wb of magnetic flux in it. If  micro r =2000. What is the magnetic field intensity in the bar ?

1. 398 AT/m
2. 398*10^(4) AT/m
3. 796 *10 ^(3) AT/m
4. 398 *10^(-4) AT/m

ANSWER:-1

Q13:- With the positive on an NPN base an ohmmeter reading b/w the other transistor terminal should be ?

1. infinite
2. high resistance
3. low resistance
4. open

ANSWER:-3

Q14:- The unit for permeability is 

1. AT/m
2. Wb/AT*m
3. Wb
4. AT/Wb

ANSWER:-2

Q15:-To operate properly a transistor base emitter junction must be forward biased with reverse bias applied to which junction

1. base emitter
2. collector emitter
3. base collector
4. collector base

ANSWER:-4

Q16:- Humans are more vulnerable to electrical shock current at?

1. 50 Hz
2. 45 Hz
3. 40 Hz
4. 48 Hz

ANSWER:-1

Q17:- Which of the following breaking is not suitable for motor?

1. Dynamic breaking
2. Fraction breaking
3. Regenerative breaking
4. plugging

ANSWER:-2

Q18:- A primary cell has an emf of 1.5 v . When short circuited it gives a current of 3 A. The internal resistance of cell is?

1. 2 ohm
2. 4.5 ohm
3. 0.5 ohm
4. 0.2 ohm

ANSWER:-3

Q19:- During the resistance welding the heat produced at the joint is proportional to?

1. volt-ampere
2. current
3. voltage
4. I(square) R

ANSWER:-3

Q20:- As a load is increased, the speed of a dc shunt motor

1. reduced slightly
2. increases slightly
3. remains constant
4. increases proportionately

ANSWER:-1