Quiz: Electrical Engineering

Exam: SSC JE

Topic: Miscellaneous

Each question carries 1 mark.

Negative marking: 1/4 mark

Time: 10 Minute

Q1. Which of the following function represents parabolic characteristics?

a) ƒ(t) = t

b) ƒ(t) = t^2

c) ƒ(t) = e^(-at)

d) ƒ(t) = Ut

Q2. The power factor of a purely resistive circuit will be

a) unity

b) zero

c) infinity

d) 0.5

Q 3. The quality factor of RCL circuit will increase if the

a) R decreases

b) R increases

c) Voltage increases

d) Impedance increases

Q 4. If the diameter of a current carrying conductor is doubled, the resistance will

a) Be reduced to half

b) To reduce to one-fourth

c) Remain same

d) Be doubled

Q5. A moving coil instrument can be used to measure

a) Low frequency alternating current

b) High frequency alternating current

c) Direct current

d) Direct current and alternating current both

Q6. The cost of a capacitor increases as

a) The size of a capacitor increase

b) Voltage rating of the capacitor increases

c) Microfarad rating of the capacitor increases

d) None of the above

Q7. The thermal time constant is the time

a) To reach the final steady temperature if the initial rate of increase of temperature were maintained constant

b) To reach 63% of fined steady temperature

c) To reach 86.6% of final steady temperature

d) To reach 37% of final steady temperature

Q8. The auto-starters (using three auto-transformers) can be used to start cage induction motor of the following type:

a) Star connected only

b) Delta connected only

c) (a) and (b) both

d) None of the above

Q9. The crawling in the induction motor is caused by

a) Improper design of the machine

b) Low voltage supply

c) High Loads

d) Harmonics developed in the motor

Q10. When the equivalent circuit diagram of double squirrel cage induction motor is constructed the two rotor cages can be considered

a) In parallel

b) In series parallel

c) In series

d) In parallel with stator

Solution

Sol.1

Ans: (b)

ƒ(t) = t^2 (parabolic characteristics)

Sol.2

Ans: (a)

Unity

Sol.3

Ans: (a)

Value of resistance, R decreases

Sol.4

Ans: (b)

To reduce to one-fourth

Sol.5

Ans: (c)

Direct current

Sol.6

Ans: (b)

Voltage rating of capacitor increases

Sol.7

Ans: (b)

To reach 63% of fined steady temperature

Sol.8

Ans: (c)

Star connected

Delta connected

Sol.9

Ans: (d)

Harmonics developed in the motor

Sol.10

Ans: (a)

In parallel