Quiz: Electrical Engineering 14 Dec 2020

Quiz: Electrical Engineering
Exam: SSC-JE
Topic: Miscellaneous

Each question carries 1 mark.
Negative marking: 1/4 mark
Time: 10 Minute

Q1. The emf induced in the armature of a shunt generator is 500 V. The armature resistance is 0.2 ohm. If the armature current is 200 A, then what is the terminal voltage?
(a) 500 V
(b) 520 V
(c) 460 V
(d) 540 V

Q2. Brushes are provided in DC machine for
(a) Smooth rotation
(b) Preventing sparking
(c) Providing a path for flow of current
(d) Reducing the losses

Q3. The expression for power plant output in kilo-watt of a hydro-electric plant is given by
(a) (75×Q×W×h×η_0)/0.736
(b) (0.736×Q×W×h)/(75×η_0 )
(c) (0.736×Q×W×h×η_0)/75
(d) None of these

Q4. The impedance reflected back to the source in Fig. below is ………

(a) 11.2 Ω
(b) 22.2 Ω
(c) 25 Ω
(d) 47.8 Ω

Q5. The rotor winding of a 3-phase wound rotor induction motor is generally ……….
connected.
(a) star
(b) delta
(c) partly star and partly delta
(d) none of the above

Q6. The reactance of the rotor circuit of a 3-phase induction motor is maximum at …….
(a) no-load
(b) full-load
(c) half full-load
(d) starting

Q7. The conditions of an induction motor at no-load resemble those of a transformer
whose secondary is ………
(a) short-circuited
(b) open-circuited
(c) supplying a variable resistive load
(d) none of the above

Q8. For the same kVA rating, the leakage flux in induction motor is …… that of
transformer.
(a) more than
(b) less than
(c) about the same as
(d) none of the above

Q9. A moving coil voltmeter gives full-side deflection of 100 V for a meter current of 1
mA. For 45 V reading, the meter current will be……
(a) 0.45 mA
(b) 1.45 mA
(c) 2.22 mA
(d) None of the above

Q10. In a dynamometer type instrument, damping is provided by………
(a) air friction
(b) eddy currents
(c) fluid friction
(d) none of the above

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