FPSC Assistant Executive Engineer (Electrical) Test

High Voltage Engineering (All questions copied from Handa)

1. Polar dielectrics are normally used for
(A) high frequencies
(B) microwaves
(C) dc and power frequencies ✓
(D) none of the above.

2. Which of the following is a polar dielectric?
(A) Teflon
(B) Quartz
(C) Nylon ✓
(D) Polyethylene.

3. The phenomenon of corona is generally accompanied by
(A) a bang
(B) a hissing sound ✓
(C) magnetic hum
(D) all of the above.

4. Van de Graaff generators are useful for
(A) Very high voltage and low current applications ✓
(B) Very high voltage and high current applications
(C) Constant high voltage and current applications
(D) High voltage pulses only.

5. A Tesla coil is a
(A) cascaded transformer
(B) coreless transformer
(C) high frequency resonant transformer ✓
(D) low impedance transformer.

6. Switching surge is
(A) high voltage dc
(B) high voltage ac
(C) short duration transient voltage ✓
(D) hyperbolically dying voltage.

7. Insulators for high voltage applications are tested for
(A) power frequency tests
(B) impulse tests
(C) both (A) and (B) above ✓
(D) none of the above.

8. Transformers contribute to radio interference due to
(A) corona discharges in air
(B) internal or partial discharges in insulation
(C) sparking
(D) any of the above. ✓

9. Surge voltage originate in power systems due to
(A) lightning
(B) switching operations
(C) faults
(D) any of the above. ✓

10. Which of the following technique/method is-used for the measurements of ac high frequency voltages ?
(A) Peak voltmeter ✓
(B) Series resistance micro ammeter
(C) Resistance potential divider
(D) Any of the above.

11. Paschen's law is associated with
(A) breakdown voltage ✓
(B) ionization
(C) thermal radiations
(D) none of the above.

Single Phase Motor (All questions copied from Handa)

12. A capacitor start single phase induction motor will usually have a power factor of
(A) unity
(B) 0.8 leading
(C) 0.6 leading
(D) 0.6 lagging. ✓

13. A capacitor start, capacitor run single phase induction motor is basically a
(A) ac series motor
(B) dc series motor
(C) 2 phase induction motor ✓
(D) 3 phase induction motor.

14. The torque developed by a split phase motor is proportional to
(A) Sine of angle between lm and ls ✓
(B) Cosine of angle between lm and Is
(C) Main winding current, Im
(D) Auxiliary winding current,Is

Synchronous Motor and Generator (From Handa)

15. An over excited synchronous motor draws current at
(A) lagging power factor
(B) leading power factor ✓
(C) unity power factor
(D) depends on the nature of load.

16. The power factor of an alternator depends on
(A) Load ✓
(B) Speed of rotor
(C) Core losses
(D) Armature losses.