Q.356 Which of the following is not true about fuel cells?
A. cost is higher than batteries
B. no recharging is needed
C. more efficient
D. need more than two electrodes
Ans.: D
Q.357 Which of the following cable is extensively used for high tension and low tension work?
A. XLPE cable
B. VIR cable
C. FVC cable
D. TRS cable
Ans.: A
Q.358 For selecting low voltage cable which of the following factors not important?
A. voltage grade
B. current carrying capacity
C. short circuit current rating
D. permissible current rating
Ans.: C
Q.359 In rotating electrical machines, the insulation temperature limit for class B type is
A. 1050 C
B. 1300 C
C. 1500 C
D. 1800 C
Ans.: B
Q.360 For given KVAR and line voltage the ratio of star to delta value of capacitor is
A. 0.333333333333
B. 1.73
C. 1
D. 3
Q.361 Which of the following is not equivalent to watts?
A. amperes/volt
B. amperes x volts
C. (amperes)2 x ohm
D. joules per second
Ans.: A
Q.362 Constant voltage source is
A. passive and bilateral
B. active and bilateral
C. active and unidirectional
D. passive and unilateral
Ans.: C
Q.363 Kirchhoffs laws are valid for
A. nonlinear circuits only
B. linear circuits only
C. passive time invariant circuits
D. both linear and non linear circuit
Ans.: D
Q.364 The emf of primary cell depends upon the
A. nature of electrolyte and nature f electrode
B. physical dimensions of a cell
C. nature of electrolyte
D. nature of electrode
Ans.: A
Q.365 Cells are connected in parallel in order to increase the
A. current capacity efficiency
B. life of the cells
C. current capacity
D. voltage rating
Ans.: C
Q.366 For the protection of power system against travelling waves, we use
A. surge diverters
B. earthing screens
C. overhead ground wires
D. none
Ans.: A
Q.367 The rate of rise of restriking voltage depends on
A. the type of circuit breaker
B. both inductance and capacitance of the system
C. the inductance of the system only
D. the capacitance of the system only
Ans.: B
Q.368 The capacitance of a capacitor is____ relative permittivity.
A. directly proportional to square of
B. inversely proportional to
C. independent of
D. directly proportional to
Ans.: D
Q.369 A circuit component that opposes the change in circuit voltage is
A. capacitance
B. resistance
C. inductance
D. all
Ans.: A
Q.370 The current through series RLC circuit under resonance condition will be
A. V/RXL
B. V/XC
C. V/R
D. none
Ans.: C