Q3. Maximum permissible earth resistance for building is
(a) 0.5 Ω
(b) 1 Ω
(c) 2 Ω
(d) 8 Ω
Q4. Reciprocal of admittance is
(b) Inductive reactance
(c) Capacitive reactance
Q5. The form factor of sinusoidal alternating current is ….
Q6. The angle of a series RLC circuit is leading if ………?
Q7. Which motor has the poorest speed control?
(a) Differentially compound motor
(b) Cumulatively compound motor
(c) Shunt motor
(d) Series motor
Q8. In Swinburne’s method of testing D.C. machines, the shunt machine is run as a
(a) motor at full load at rated speed and rated voltage
(b) generator at full load at rated speed and rated voltage
(c) generator at no load at rated speed and rated voltage
(d) motor at no load at rated speed and rated voltage
Q9. Ward-Leonard control is basically a:
(a) Voltage control method
(b) field diverter method
(c) field control method
(d) armature resistance control method
Q10. What can be the approximate efficiency of a 3-phase, 50 Hz, 4-pole induction motor, which is running at 1470 rpm?
(a) 92 %
(b) 95 %
(c) 96 %
(d) 98 %