A crystal oscillator :
(A) Gives high output voltage
(B) Works at high efficiency
(C) Frequency of oscillation remains constant
(D) Requires very low DC supply
Answer - - C

 In a load flow study if |V|and  |δ| are specified at a bus. This bus is known as :
(A) Slack bus
(B) Load bus
(C) Voltage controlled bus
(D) None of these
Answer - - A

If P, be the iron loss and P, be the full load copper loss in a transformer, the ratio of rated load current to load current at which maximum efficiency occurs is:
(A) (Pi/Pc) ^1/2
(B) (Pc/Pi) ^1/2
(C) Pi/Pc
(D) Pc/Pi

Answer - - A

The power factor under-excited synchronous motor is always
(A) Leading
(B) Lagging
(C) Unity
(D) more than unity

Answer - - B

A source has an emf of 10 V and an impedance of (500+j100) ohms. The amount of maximum power transferred to the load will be
(A) 0.5 mw
(B) 0.05 mw
(C) 0.05 w
(D) 0.5 w

Answer - - C

A DC series motor should not be started
(A) at full load
(B) at no load
(C) with half of the full load
(D) none of the above

Answer - - A

The surge impedance of 400 km long overhead transmission line is 400 ohms, For a 200 km length of the same line, the surge impedance :
(A) 200 ohm
(B) 800 ohm
(C) 400 ohm
(D) 100 ohm

Answer - - C

The insulation strength of a EHV transmission  line is mainly governed by :
(A) Load power factor
(B) Harmonies
(C) Corona
(D) Switching over voltage

Answer - - D