TSSPDCL JLM Junior Lineman 15th Dec 2019 Exam Answer Key With Complete Explanation Previous Year Question Papers

6. Which of the d.c. motor is not used in driving the belt connected loads ?
(A) shunt motor
(B) differentially compound motor
(C) cumulatively compound motor
(D) series motor

7. If the applied voltage to a d.c. motor is 220 V, then the back e.m.f., for maximum power developed is:
(A) 220 V
(B) 110 V
(C) 210 V
(D) 440 V

8. The unit of m.m.f. (magneto motive force) is :
(A) Ampere – meter
(B) Ampere turn /meter
(C) Wb/m²
(D) Ampere turn – meter

9. A 2 kW water heater operates 8 hrs per day. If cost of each unit is ₹ 3.00 per unit, then calculate the total bill for one month (30 days), assuming the charges for first 100 units are nil.
(A) ₹1140.00
(B) ₹ 1440.00
(C) ₹ 1740.00
(D) ₹840.00

10. From no-load speed to full-load speed, the torque of a 3-phase synchronous motor :
(A) first remains constant & then decreases
(B) remains constant throughout
(C) always decreases
(D) always increases